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1. Antibacterial potential and mechanism of action of dithiocyano‐methane as a bactericidal agent for farm disinfection

Author: Qin Huabin, Ke Wenjie, L.‐M. Qin, Ying Yang, Y.‐J. Liu, Hui Yu, Chen Yanfeng, and Yuansheng Tan
Subjects: Farms, Disinfectant, Microbial Sensitivity Tests, Applied Microbiology and Biotechnology, Bacterial cell structure, Microbiology, 03 medical and health sciences, Minimum inhibitory concentration, chemistry.chemical_compound, Lactate dehydrogenase, medicine, Animals, 030304 developmental biology, 0303 health sciences, biology, 030306 microbiology, Chemistry, General Medicine, biology.organism_classification, Aeromonas hydrophila, Anti-Bacterial Agents, Disinfection, Mechanism of action, Alkaline phosphatase, medicine.symptom, Methane, Bacteria, Disinfectants, Biotechnology
Abstract: AIMS This study aimed to investigate the antibacterial ability and action mechanism of dithiocyano-methane against Aeromonas hydrophila, so as to provide a reference for its application in farm disinfection. METHODS AND RESULTS After exposing the bacteria to dithiocyano-methane, the minimum inhibitory concentration (MIC), minimum bactericide concentration (MBC), activities of alkaline phosphatase, aspartate aminotransferase (AST), alanine aminotransferase (ALT), lactate dehydrogenase and electric conductivity in bacterial suspensions were determined, transmission electron microscope images on cellular structure and SDS-PAGE profile of bacterial proteins were analysed and the expression of genes related to the above experimental observations was confirmed by real-time quantitative PCR. The MIC and MBC of dithiocyano-methane against three tested strains was 1·46 and 2·93 mg l-1 respectively. The results showed that dithiocyano-methane significantly damaged bacterial cell structure, inhibited the biosynthesis of bacterial proteins and changed the integrity and permeability of bacterial cell wall and cell membrane. CONCLUSIONS Dithiocyano-methane showed remarkable antibacterial ability against three tested strains, indicating it is a potential effective bactericidal agent for preventing animal diseases resulted from Aer. hydrophila. SIGNIFICANCE AND IMPACT OF THE STUDY To our best knowledge, this is the first report to examine the antibacterial ability and action mechanism of dithiocyano-methane against bacteria. The results demonstrate the great potential of dithiocyano-methane as a disinfectant against Aer. hydrophila in settings such as aquaculture ponds and livestock farms.
Published: 2021
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2. [An investigation of normal urinary manganese value in healthy adults in different places in Guangxi, China]

Author: L M, Qin, R J, Li, P L, Ning, Y, Li, and X P, Li
Subjects: Adult, China, Manganese, Young Adult, Adolescent, Metals, Humans, Middle Aged, Healthy Volunteers, Mining
Published: 2018

3. [The research advance of small molecules inducing embryonic stem cells to differentiate into corneal epithelial-like cells]

Author: L M, Qin, H, Chen, and Y F, Huang
Subjects: Biomedical Research, Stem Cells, Epithelium, Corneal, Animals, Humans, Cell Differentiation, Epithelial Cells, Embryonic Stem Cells, Corneal Diseases
Abstract: Stem cells are becoming a hot topic of basic medicine and clinical research because of their wide self-renewal and differentiation potential in recent years. A number of small molecules that can be used to control stem cell self-renewal, lineage differentiation, reprogramming and regeneration could regulate stem cell fate quickly and reversibly. If small molecules could induce human embryonic stem cells to differentiate into corneal epithelial-like cells in vivo, corneal cell transplantation therapy will have unlimited source of corneal epithelium. More patients will obtain effective and timely treatment.干细胞因有强大的自我更新能力和多向分化潜能，成为近年来基础医学和临床研究的热点。利用小分子化合物调节效应迅速可逆的特点，从小分子化合物促进胚胎干细胞存活、自我更新及分化发育等方面入手，深入了解小分子化合物对胚胎干细胞的诱导作用，以此探讨在体外将胚胎干细胞诱导分化为角膜上皮样细胞的方法，为角膜细胞移植治疗获得无限制角膜上皮来源，减少临床对受限于角膜供体的角膜移植手术的需求，使更多患者获得有效和及时治疗提供参考途径。
Published: 2017

4. Association between matrix metalloproteinase-9 rs3918242 polymorphism and development of coronary artery disease in a Chinese population

Author: L M Qin, H Zuo, A L Wang, X H Shi, and G M Qin
Subjects: Male, China, medicine.medical_specialty, Single-nucleotide polymorphism, Coronary Artery Disease, 030204 cardiovascular system & hematology, Biology, Polymorphism, Single Nucleotide, Gastroenterology, Coronary artery disease, 03 medical and health sciences, 0302 clinical medicine, Asian People, Gene Frequency, Diabetes mellitus, Internal medicine, Genotype, Odds Ratio, Genetics, medicine, Humans, Genetic Predisposition to Disease, Molecular Biology, Allele frequency, Alleles, Genetic Association Studies, Aged, Case-control study, General Medicine, Odds ratio, Middle Aged, medicine.disease, Blood pressure, Matrix Metalloproteinase 9, Case-Control Studies, 030220 oncology & carcinogenesis, Female
Abstract: We conducted a case-control study to investigate the role of one single nucleotide polymorphism of MMP-9 rs3918242 in the development of coronary artery disease. The rs3918242 was amplified with 435-bp DNA fragments using polymerase chain reaction coupled with restriction fragment length polymorphism. When compared with control subjects, patients with coronary artery disease had higher systolic and diastolic blood pressure, as well as higher triglycerides (P < 0.05), were more likely to suffer from diabetes mellitus, and had lower total cholesterol and high-density lipopolysaccharides. Using unconditional logistic analysis, we found that individuals with CT and TT genotypes were associated with increased risk of coronary artery disease in a co-dominant model, and the ORs (95%CI) were 1.50 (1.02-2.20) and 6.89 (2.51-23.41) for CT and TT, respectively. We observed that the T allele of rs3918242 was correlated with increased risk of coronary artery disease (OR = 1.88, 95%CI = 1.39-2.55). In conclusion, we suggest that the TT and CT genotypes and T allele of MMP-9 rs3918242 polymorphism is correlated with an increased risk of coronary artery disease in a Chinese population.
Published: 2016
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5. Moments of the spin structure functions g1p and g1d for 0.05<Q2<3.0 GeV2

Author: R. A. Schumacher, G. V. O'Rielly, C. D. Keith, Cynthia Marie Hadjidakis, Z. W. Zhao, Chaden Djalali, D. G. Jenkins, Michael Dugger, S. Tkachenko, H. O. Funsten, A. I. Ostrovidov, A. C S Lima, S. Bültmann, L. Morand, M. R. Niroula, T. A. Forest, D. G. Ireland, G. Asryan, Volker D. Burkert, A. S. Biselli, J. Pierce, Elton Smith, M. J. Amaryan, M. MacCormick, O. P. Dzyubak, R. A. Niyazov, I. Hleiqawi, S. L. Careccia, Larry Weinstein, Avraham Klein, E. Golovatch, H. G. Juengst, K. Moriya, Daniel S. Carman, J. Kuhn, Philip L. Cole, S. McAleer, H. Hakobyan, S. Anefalos Pereira, P. D. Rubin, L. Blaszczyk, P. Corvisiero, Y. G. Sharabian, A. Fradi, L. Cheng, G. Audit, A.V. Stavinsky, C. E. Hyde-Wright, F. Sabatié, Nikolay Shvedunov, D. Heddle, P. Stoler, Friedrich Klein, J. P. Cummings, R. De Vita, N. Markov, V. Sapunenko, C. Salgado, Dinko Pocanic, L. Elouadrhiri, N. Kalantarians, S. Stepanyan, K. S. Egiyan, R. C. Minehart, C. A. Meyer, J. Ball, M. Taiuti, S. E. Kuhn, I. I. Strakovsky, M. Bektasoglu, M. Kossov, K. Mikhailov, K.H. Hicks, R. J. Feuerbach, G. V. Fedotov, M. Nozar, A. Deur, I. Popa, V. Crede, J. W. Price, Shifeng Chen, M. Anghinolfi, Laird Kramer, D. P. Watts, H. Egiyan, G. Gavalian, John A. Mueller, L. Casey, B. L. Berman, P. Mattione, B. B. Niczyporuk, G. Rosner, N. Benmouna, N. Pivnyuk, Kwangsoo Kim, J. T. Goetz, M. Mirazita, G. Riccardi, J. R. Calarco, R. A. Miskimen, B. A. Raue, B. McKinnon, W. J. Briscoe, L. M. Qin, R. G. Fersh, P. Eugenio, J. Langheinrich, C. Butuceanu, C. Hanretty, S. S. Stepanyan, E. Pasyuk, S. A. Philips, M. Ripani, G. Ricco, S. A. Morrow, C. Paterson, Y. Ilieva, Michael Vineyard, Victor Mokeev, M. Klusman, B. M. Preedom, D. Branford, P. Collins, B. Moreno, J. R. Johnstone, Lorenzo Zana, J. P. Santoro, Tsutomu Mibe, Gerald Feldman, J. M. Laget, L. Todor, D. Protopopescu, K. L. Giovanetti, S. V. Kuleshov, C. Marchand, S. Pozdniakov, M. Garçon, M. L. Seely, Ji Li, D. J. Tedeschi, G. E. Dodge, H. Y. Lu, J. Lachniet, I. Bedlinskiy, Marco A. Huertas, A. Tkabladze, M. D. Mestayer, E. L. Isupov, P. V. Degtyarenko, D. Rowntree, K. Livingston, Michael L. Williams, M. Holtrop, R. Suleiman, V. Kuznetsov, D. S. Dale, J. Zhang, S. Boiarinov, D. I. Sober, Gerard Gilfoyle, F. X. Girod, G. S. Mutchler, N. A. Baltzell, I. Niculescu, D. Sokhan, J. Salamanca, K. A. Griffioen, D. Lawrence, M. Guillo, N. Guler, R. De Masi, L. El Fassi, J. W C McNabb, Sylvain Bouchigny, H. Denizli, M. Guidal, M. Battaglieri, J. Hardie, S. Strauch, J. D. Kellie, Z. Krahn, R. Nasseripour, S. Barrow, P. Rossi, R. Dickson, N. Baillie, D. Doughty, V. Gyurjyan, R. Bradford, K. Lukashin, B. E. Stokes, G. S. Adams, H. Bagdasaryan, P. Nadel-Turonski, A. V. Skabelin, K. Joo, A. Cazes, S. Procureur, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, L. Guo, M. Ungaro, D. P. Weygand, E. Wolin, N. Hassall, M. Bellis, D. G. Crabb, J. Yun, D. Cords, P. Bosted, A. Yegneswaran, N. Dashyan, Y. Prok, Barry Ritchie, E. De Sanctis, H. S. Jo, S. Niccolai, R. Fatemi, A. V. Vlassov, P. Coltharp, R. W. Gothe, M. M. Ito, K. Y. Kim, M. Osipenko, K. Beard, L. C. Smith, E. Munevar, Kalvir S. Dhuga, B. S. Ishkhanov, O. Pogorelko, M. Khandaker, B. Zhao, F. W. Hersman, W. Kim, G. Niculescu, N. Gevorgyan, L. C. Dennis, B. E. Bonner, H. Avakian, D. Sharov, S. A. Dytman, W. K. Brooks, K. Park, V. P. Kubarovsky, J. Shaw, Michael Wood, K. Hafidi, and V. S. Serov
Subjects: Physics, Nuclear and High Energy Physics, Chiral perturbation theory, Heavy baryon chiral perturbation theory, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hadron, 01 natural sciences, Baryon, Nuclear physics, Polarizability, 0103 physical sciences, Sum rule in quantum mechanics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The spin structure functions g 1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q 2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH3 and ND3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 Q 2 5 GeV 2 and W 3 GeV . The first moments of g 1 for the proton and deuteron are presented – both have a negative slope at low Q 2 , as predicted by the extended Gerasimov–Drell–Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ 0 p is also reported. This quantity shows strong Q 2 dependence at low Q 2 . Our analysis of the Q 2 evolution of the first moment of g 1 shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ 0 p data and Chiral Perturbation calculations for γ 0 p , even at the lowest Q 2 .
Published: 2009
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6. Exclusive ρ0 electroproduction on the proton at CLAS

Author: J. Langheinrich, S. S. Stepanyan, E. Pasyuk, S. A. Philips, N. Dashyan, V. Sapunenko, G. Ricco, Alexei V. Klimenko, N. A. Baltzell, C. Salgado, Dinko Pocanic, Barry Ritchie, H. Denizli, A. V. Skabelin, K. A. Griffioen, B. Zhao, V. Gyurjyan, A. I. Ostrovidov, R. Fatemi, K. Park, S. E. Kuhn, Latifa Elouadrhiri, R. C. Minehart, Kei Moriya, C. A. Meyer, H. G. Juengst, B. E. Stokes, G. S. Adams, G. V. Fedotov, V. P. Kubarovsky, J. Zhang, P. Eugenio, K. P. Adhikari, A. V. Vlassov, D. P. Weygand, G. E. Dodge, H. Y. Lu, M. J. Amaryan, G. V. O'Rielly, S. Niccolai, Z. W. Zhao, V. Mokeev, Y. Ilieva, Ji Li, D. G. Jenkins, C. Tur, Gerard Gilfoyle, Elton Smith, H. Hakobyan, A.V. Stavinsky, J. D. Kellie, M. Guidal, M. MacCormick, I. Hleiqawi, S. L. Careccia, R. De Vita, Friedrich Klein, Brian Raue, P. V. Degtyarenko, M. D. Mestayer, J. P. Didelez, R. Nasseripour, L. Todor, F. W. Hersman, P. Coltharp, E. L. Isupov, J. P. Cummings, W. Gohn, S. A. Morrow, S. McAleer, M. Anghinolfi, P. Nadel-Turonski, D. Sokhan, D. Protopopescu, D. J. Tedeschi, M. Holtrop, Michael L. Williams, P. Collins, K. L. Giovanetti, I. Niculescu, F. X. Girod, L. Blaszczyk, B. Carnahan, James Mueller, D. Lawrence, R. G. Fersch, R. A. Miskimen, B. McKinnon, S. Pozdniakov, M. Garçon, J. J. Melone, M. M. Ito, S. Boiarinov, Larry Weinstein, L. Zana, P. D. Rubin, R. De Masi, D. Keller, I. Bedlinskiy, B. M. Preedom, S. Anefalos Pereira, D. Schott, Y. G. Sharabian, R. A. Schumacher, P. L. Cole, M. Yurov, M. Taiuti, S. Mehrabyan, D. Branford, L. C. Smith, E. Munevar, G. S. Mutchler, B. S. Ishkhanov, Michael Wood, K. Hafidi, L. Graham, M. Kossov, M. E. McCracken, C. I O Gordon, J. M. Laget, V. Kuznetsov, J. Kuhn, E. Hourany, M. Khandaker, V. S. Serov, L. C. Dennis, B. E. Bonner, J. W. Price, Tsutomu Mibe, S. Bültmann, G. Audit, Shifeng Chen, C. Bookwalter, N. Gevorgyan, M. Osipenko, C. E. Hyde-Wright, J. P. Santoro, H. S. Jo, H. Avakian, L. Morand, I. Popa, D. Sharov, T. A. Forest, G. Riccardi, M. R. Niroula, E. De Sanctis, O. Pogorelko, S. Stepanyan, P. Mattione, C. Butuceanu, M. S. Saini, D. Doughty, J. Pierce, M. Ripani, B. L. Berman, Avraham Klein, L. M. Qin, M. Aghasyan, E. Wolin, Sergey Kuleshov, W. J. Briscoe, D. Heddle, J. T. Goetz, D. I. Sober, Kalvir S. Dhuga, M. Bektasoglu, S. A. Dytman, S. Dhamija, M. Nozar, E. Polli, M. Mirazita, C. Paterson, J. P. Ball, R. W. Gothe, Y. Prok, B. Moreno, W. Kim, J. Hardie, Hall Crannell, D. S. Carman, K. Livingston, G. Rosner, C. Marchand, G. Niculescu, D. S. Dale, N. Baillie, S. Park, Sylvain Bouchigny, J. Lachniet, A. Tkabladze, D. G. Crabb, R. Dickson, Michael Vineyard, D. G. Ireland, V. Crede, J. R. Calarco, P. Khetarpal, N. Guler, J. Salamanca, L. El Fassi, J. W C McNabb, S. Barrow, P. Rossi, L. Casey, H. Bagdasaryan, Volker D. Burkert, A. S. Biselli, B. B. Niczyporuk, N. Pivnyuk, P. Stoler, C. Hanretty, Laird Kramer, J. R. Johnstone, L. Guo, M. Ungaro, A. Fradi, K. Joo, D. Cords, N. Markov, A. Yegneswaran, K. Hicks, M. Battaglieri, R. Bradford, K. S. Egiyan, A. Cazes, S. Procureur, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, N. Hassall, M. Bellis, K. Mikhailov, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Corvisiero, S. Strauch, D. P. Watts, H. Egiyan, I. I. Strakovsky, A. Deur, W. K. Brooks, R. J. Feuerbach, Cynthia Marie Hadjidakis, M. Guillo, Chaden Djalali, Michael Dugger, L. Cheng, F. Sabatié, Nikolay Shvedunov, N. Kalantarians, G. Gavalian, S. Tkachenko, and N. Benmouna
Subjects: Quark, Physics, REPRESENTATION, Nuclear and High Energy Physics, Particle physics, Valence (chemistry), Proton, Hadron, Parton, VECTOR-MESON ELECTROPRODUCTION, Approx, PHOTONS, QCD, EVOLUTION, High Energy Physics - Experiment, Regge theory, Nuclear physics, Scattering amplitude, GENERALIZED PARTON DISTRIBUTIONS, VIRTUAL COMPTON-SCATTERING, VECTOR-MESON ELECTROPRODUCTION, LARGE MOMENTUM-TRANSFER, DIFFRACTIVE PRODUCTION, PHOTOPRODUCTION, PHOTONS, QCD, REPRESENTATION, EVOLUTION, LARGE MOMENTUM-TRANSFER, GENERALIZED PARTON DISTRIBUTIONS, DIFFRACTIVE PRODUCTION, PHOTOPRODUCTION, Nuclear Experiment, VIRTUAL COMPTON-SCATTERING
Abstract: The $e p\to e^\prime p \rho^0$ reaction has been measured, using the 5.754 GeV electron beam of Jefferson Lab and the CLAS detector. This represents the largest ever set of data for this reaction in the valence region. Integrated and differential cross sections are presented. The $W$, $Q^2$ and $t$ dependences of the cross section are compared to theoretical calculations based on $t$-channel meson-exchange Regge theory on the one hand and on quark handbag diagrams related to Generalized Parton Distributions (GPDs) on the other hand. The Regge approach can describe at the $\approx$ 30% level most of the features of the present data while the two GPD calculations that are presented in this article which succesfully reproduce the high energy data strongly underestimate the present data. The question is then raised whether this discrepancy originates from an incomplete or inexact way of modelling the GPDs or the associated hard scattering amplitude or whether the GPD formalism is simply inapplicable in this region due to higher-twists contributions, incalculable at present., Comment: 29 pages, 29 figures
Published: 2008
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7. Measurement of the x- and Q2-dependence of the asymmetry A1 on the nucleon

Author: L. Elouadrhiri, R. A. Miskimen, M. Khandaker, B. McKinnon, G. Rosner, I. I. Strakovsky, R. W. Gothe, M. Bellis, D. Branford, P. Rossi, K. Y. Kim, A. Deur, S. V. Kuleshov, H. G. Juengst, K. S. Egiyan, P. V. Degtyarenko, P. Dragovitsch, M. Battaglieri, M. Nozar, D. J. Tedeschi, M. Taiuti, I. Bedlinskiy, L. Todor, J. P. Cummings, D. Doughty, F. X. Girod, S. Niccolai, D. Protopopescu, Laird Kramer, J. Hardie, V. Gyurjyan, R. De Masi, B. E. Stokes, F. Ronchetti, R. A. Schumacher, P. Corvisiero, V. P. Kubarovsky, G. S. Adams, D. Heddle, Brian Raue, M. Mirazita, G. Ricco, Dinko Pocanic, L. C. Smith, S. Tkachenko, R. Bradford, K. Lukashin, Y. G. Sharabian, O. Pogorelko, E. Wolin, S. McAleer, S. E. Kuhn, V. Sapunenko, B. S. Ishkhanov, Ji Li, Jean Laget, N. Benmouna, N. Pivnyuk, Rakhsha Nasseripour, B. Carnahan, L. C. Dennis, B. E. Bonner, M. Guillo, C. Tur, J. Napolitano, A. I. Ostrovidov, R. Fatemi, A. C S Lima, Gerard Gilfoyle, D. Cords, Marco A. Huertas, H. Avakian, E. S. Smith, K. Park, A. V. Vlassov, D. G. Ireland, M. R. Niroula, V. Batourine, B. Zhao, Y. Ilieva, E. L. Isupov, R. Suleiman, I. Hleiqawi, L. Guo, S. Bültmann, Volker D. Burkert, A. S. Biselli, H. S. Jo, E. Golovatch, Michael L. Williams, P. Bosted, S. L. Careccia, James Mueller, G. S. Mutchler, R. DeVita, M. Ripani, S. A. Morrow, Atilla Gonenc, M. MacCormick, C. Djalali, F. W. Hersman, T. A. Forest, M. Anghinolfi, P. D. Rubin, S. Stepanyan, A. Cazes, G. Gavalian, J. W. Price, S. Boiarinov, Maryam Moteabbed, B. M. Preedom, N. A. Baltzell, Sylvain Bouchigny, J. P. Ball, Y. Prok, K. L. Giovanetti, Michael Dugger, A. Yegneswaran, Shifeng Chen, K. V. Dharmawardane, J. Pierce, M. Kossov, Avraham Klein, Jens H. Kuhn, A. Stavinsky, Larry Weinstein, P. Ambrozewicz, E. Pasyuk, L. M. Qin, K. A. Griffioen, H. O. Funsten, P. Coltharp, U. Thoma, C. Keith, Lorenzo Zana, D. P. Weygand, S. A. Dytman, Hall Crannell, M. M. Ito, N. Baillie, J. T. Goetz, G. V. O'Rielly, C. Paterson, M. Klusman, K. Livingston, V. Crede, Z. W. Zhao, Frank Klein, D. G. Crabb, J. R. Calarco, S. Strauch, D. G. Jenkins, C. Salgado, J. D. Kellie, G. E. Dodge, S. Pozdniakov, N. Guler, J. W C McNabb, M. D. Mestayer, I. Niculescu, Nikolay Shvedunov, D. Lawrence, M. Guidal, D. I. Sober, S. S. Stepanyan, M. Osipenko, S. Barrow, F. Sabatié, Michael Vineyard, K. Beard, M. Garçon, B. Mecking, G. Riccardi, J. Shaw, C. Butuceanu, Michael Wood, W. K. Brooks, K. Hafidi, V. S. Serov, Victor Mokeev, M. Ungaro, K. Joo, J. Yun, J. P. Santoro, Roy Thompson, K. Kim, J. J. Manak, P. Eugenio, J. Zhang, H. Bagdasaryan, P. Collins, Daniel S. Carman, C. Hadjidakis, C. E. Hyde-Wright, M. Bektasoglu, J. Langheinrich, S. A. Philips, G. Niculescu, M. Holtrop, Hong Lu, P. L. Cole, P. Nadel-Turonski, Tsutomu Mibe, B. B. Niczyporuk, J. Lachniet, A. Tkabladze, D. Rowntree, R. S. Hakobyan, J. Donnelly, O. P. Dzyubak, R. A. Niyazov, R. J. Feuerbach, L. Morand, P. Stoler, E. De Sanctis, K. Hicks, W. Kim, Susan Taylor, K. Mikhailov, H. Egiyan, N. Markov, Barry Ritchie, G. Asryan, H. Denizli, A. V. Skabelin, R. C. Minehart, C. A. Meyer, G. V. Fedotov, and E. Polli
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Momentum transfer, Quark model, Parton, 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, Invariant mass, 010306 general physics, Nucleon, media_common
Abstract: We report results for the virtual photon asymmetry A{sub 1} on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton ({sup 15}NH{sub 3}) and deuteron ({sup 15}ND{sub 3}) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present paper, we concentrate on our results for A{sub 1}(x,Q{sup 2}) and the related ratio g{sub 1}/F{sub 1}(x,Q{sup 2}) in the resonance and the deep inelastic regions for our lowest and highest beam energies, covering a range in momentum transfer Q{sup 2} from 0.05 to 5.0 GeV{sup 2} and in final-state invariant mass W up to about 3 GeV. Our data show detailed structure in the resonance region, which leads to a strong Q{sup 2}--dependence of A{sub 1}(x,Q{sup 2}) for W below 2 GeV. At higher W, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but A{sub 1}(x,Q{sup 2}) is not strictly Q{sup 2}--independent. We add significantly to the world data set at high x, up to x = 0.6. Our data exceed the SU(6)-symmetric quark model expectation for both the proton and the deuteron whilemore » being consistent with a negative d-quark polarization up to our highest x. This data set should improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions.« less
Published: 2006
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8. A Flexible Metamaterial Terahertz Perfect Absorber

Author: N G Zhang, Y W Zheng, Z P Qin, X R Chen, S Z Li, G C Wei, S X Wang, L M Qin, and Kan Liu
Subjects: Materials science, business.industry, Terahertz radiation, Metamaterial, Sorption, 02 engineering and technology, Dielectric, 021001 nanoscience & nanotechnology, 01 natural sciences, 010309 optics, 0103 physical sciences, Optoelectronics, 0210 nano-technology, business, Absorption (electromagnetic radiation)
Published: 2017
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9. Theep→e′pηReaction at and above theS11(1535)Baryon Resonance

Author: M. J. Amaryan, M. Taiuti, S. K. Matthews, J. Ficenec, Gyurjyan, W. Kim, A. Longhi, R. A. Schumacher, B. E. Bonner, L. Elouadrhiri, A. P. Freyberger, R. Magahiz, Robert E. Welsh, S. Dytman, S. Whisnant, B. M. Preedom, Federico Ronchetti, R. J. Feuerbach, K. L. Giovanetti, B. Asavapibhop, Michael Dugger, Shalev Gilad, De Sanctis E, A. V. Vlassov, G. Ricco, J. R. Kane, H. Avakian, Philip L. Cole, J. P. Cummings, G. S. Adams, Larry Weinstein, R. A. Miskimen, K. Joo, J. Shaw, R. W. Major, Moshe Gai, M. Kossov, W. J. Briscoe, D. Rowntree, D. Doughty, K. Beard, W. K. Brooks, Friedrich Klein, R. S. Hicks, Brian Raue, Kevin Fissum, Kalvir S. Dhuga, Barry Ritchie, A. Coleman, K. A. Griffioen, M. M. Ito, G. Riccardi, L. M. Qin, J. J. Manak, M. Mirazita, J. M. Laget, C. E. Hyde-Wright, J. W C McNabb, M. S. Ohandjanyan, D. Heddle, C. Salgado, H. R. Weller, Roy Thompson, Curtis Smith, D. P. Weygand, Herbert O. Funsten, S. A. Philips, Patrick Girard, Y. Kuang, H. Egiyan, M. Witkowski, Bernhard Mecking, Mestayer, A. J. Sarty, Jing Zhao, S. Stepanyan, De Vita R, D. G. Jenkins, C. Djalali, Z. L. Zhou, M. Lucas, Airton Deppman, D. I. Sober, A. Shafi, D. Hancock, Avraham Klein, Leskin Ga, M. Battaglieri, S. McAleer, William Bertozzi, E. Polli, E. Anciant, L. Farhi, G. E. Dodge, Daniel S. Carman, V. B. Gavrilov, O. Pogorelko, A. K. Opper, G. Audit, J. W. Price, M. Khandaker, E. Wolin, P. V. Degtyarenko, Y. Patois, Gerard Gilfoyle, Dinko Pocanic, L.C. Dennis, K. Loukachine, N. Pivnyuk, M. Bektasoglu, S. E. Kuhn, S. M. Shuvalov, D. Lawrence, M. Eckhause, J. Napolitano, M. Ripani, M. Guillo, Jochen Heisenberg, Y. V. Efremenko, Volker D. Burkert, M. Sanzone, J. Connelly, Donal Day, M. Sargsyan, G. A. Peterson, M. Guidal, A. V. Skabelin, J. Yun, D. Cords, A. Yegneswaran, A. S. Biselli, Elton Smith, S. Barrow, M. Holtrop, Thomas E. Smith, G. S. Mutchler, M. Anghinolfi, Hall Crannell, D. G. Crabb, James Mueller, S. Taylor, P. D. Rubin, G. Capitani, F. Roudot, D. J. Tedeschi, Y. G. Sharabian, M. Spraker, Sapunenko, R. C. Minehart, M. Klusman, Nicola Bianchi, S. Boiarinov, C. A. Meyer, J. S. McCarthy, B. Carnahan, Thierry Auger, A. R. Reolon, Michael Vineyard, C. Marchand, P. Rossi, P. Dragovitsch, F. W. Hersman, R. A. Demirchyan, T. Y. Tung, J. Hardie, K. Y. Kim, Muccifora, R. A. Niyazov, John T. O'Brien, P. Corvisiero, K. S. Egiyan, Calarco, P. Stoler, and K. Hicks
Subjects: Baryon, Physics, Nuclear physics, Particle physics, Photon, Amplitude, Angular distribution, Meson, Momentum transfer, General Physics and Astronomy, Resonance, Invariant (physics), Nuclear Experiment
Abstract: New cross sections for the reaction e p-->e p eta are reported for total center of mass energy W = 1.5--1.86 GeV and invariant momentum transfer Q2 = 0.25--1.5 (GeV/c)(2). This large kinematic range allows extraction of important new information about response functions, photocouplings, and eta N coupling strengths of baryon resonances. Newly observed structure at W approximately 1.65 GeV is shown to come from interference between S and P waves and can be interpreted with known resonances. Improved values are derived for the photon coupling amplitude for the S11(1535) resonance.
Published: 2001
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10. The CLAS drift chamber system

Author: S. Dytman, Daniel S. Carman, G. Jacobs, S. Christo, S. E. Kuhn, R. Miskimen, M. Kossov, K.G. Vansyoc, J. W C McNabb, D. Tilles, C. Martin, W.S. Duncan, James Mueller, F. Roudot, R. A. Schumacher, R. A. Thompson, R. J. Feuerbach, G.R. Wilkin, Michael Vineyard, J. Yun, Avraham Klein, A. Yegneswaran, W. Tuzel, G. E. Dodge, F. Barbosa, B. B. Niczyporuk, V. Gyurjyan, R. W. Major, T. Dooling, M. D. Mestayer, B. A. Raue, B. Asavapibhop, R. Magahiz, Larry Weinstein, J.E. O'Meara, D. J. Tedeschi, P. Bonneau, C. E. Hyde-Wright, Friedrich Klein, R. S. Hicks, T McGuckin, J. Robb, K.H. Hicks, L. M. Qin, and Gerard Gilfoyle
Subjects: Physics, Nuclear and High Energy Physics, Toroid, Electromagnet, Spectrometer, business.industry, Superconducting magnet, Tracking (particle physics), Linear particle accelerator, Particle detector, law.invention, Nuclear physics, Optics, Planar, law, business, Instrumentation
Abstract: The CEBAF Large Acceptance Spectrometer at 12 GeV (CLAS12) is located in Hall B, one of the experimental halls at Jefferson Lab. The forward part of CLAS12 is built around a superconducting toroidal magnet. The six coils of the toroid divide the detector azimuthally into six sectors. Each sector contains three multi-layer drift chambers for reconstructing the trajectories of charged particles originating from a fixed target. Each of the 18 planar chambers has two “superlayers” of six layers each, with the wires in the two adjacent superlayers oriented at ± 6 ° stereo angles. Each layer has 112 hexagonal cells spanning a range from about 5 ° to 40 ° in polar angle. The six-layer structure provides redundancy in track segment finding and good tracking efficiency even in the presence of some individual wire inefficiency. The design, construction, operation, and calibration methods are described, and estimates of the efficiency and resolution are presented from in-beam measurements.
Published: 2000
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11. Alternate Reagent Ion Method in Ion Mobility Spectrometry

Author: G. Yan, L. M. Qin, and L.Y. Ting
Subjects: Solvent, Analyte, Chemistry, Interference (communication), Ion-mobility spectrometry, Reagent, Standard addition, Inorganic chemistry, Analytical chemistry, QD1-999, Analytical Chemistry, Ion
Abstract: Ion mobility spectrometry (IMS) is very sensitive to many organic functional groups. Consequently, analyses using IMS are often plagued by interference from organic solvents, and the analyte signal becomes corrupted or even unresolved. This problem has been identified as a major limiting factor of IMS performance. Therefore, techniques to eliminate solvent interference are of great interest in current research. Three techniques have been proposed. They are: (1) alternate reagent ion method, (2) standard addition method, and (3) GC pre-separation. Recently the alternate reagent method (a.k.a. reagent substitution) has been effectively developed. This paper examines and discusses the details of the recent progress of this method.
Published: 2000

12. Tensor polarization in elastic electron-deuteron scattering to the highest possible momentum transfers

Author: S. A. Wood, S. Stepanyan, John C. Mitchell, D. J. Mack, R. D. Carlini, S. Mtingwa, R. Mohring, Justin I. McIntyre, A. F. Lung, J. Ball, L. M. Qin, W. Boeglin, H. Breuer, H. Mrktchyan, H. Anklin, Christophe Furget, J.E. Ducret, Paul Gueye, S. Kox, K. Gustafsson, L. Lu, Charles Glashausser, W. Turchinetz, S. Beedoe, G. J. Kumbartzki, D. Abbott, W. Schmidt, P. Rutt, J. A. Dunne, S. Danagoulian, N. S. Chant, E. Tomasi-Gustafsson, A. Ahmidouch, K. Vansyoc, J. Zhao, E. Voutier, P. G. Roos, K. A. Dow, W. Zhao, F. Merchez, A. Honegger, M. Garçon, D. Pitz, Ronald Gilman, J. Volmer, J. Jourdan, W. F. Vulcan, E.J. Stephenson, R. Sawafta, L. Eyraud, C. Yan, J. Arvieux, L. Ewell, Raphael Noel Tieulent, K. Hafidi, Pete Markowitz, J. S. Real, Ronald Ransome, D. G. Meekins, L. Bimbot, E. J. Beise, and C. Williamson
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Scattering, Momentum transfer, Elastic electron, Perturbative QCD, Polarimeter, Polarization (waves), Nuclear physics, Recoil, Deuterium, High Energy Physics::Experiment, Nuclear Experiment
Abstract: In elastic electron-deuteron scattering, the tensor polarization moments t 20 , t 21 and t 22 , together with the unpolarized cross-sections, have been measured up to a momentum transfer of 1.8 (GeV/c) 2 , or 6.8 fm −1 . The experiment was performed at Jefferson Laboratory using the recoil deuteron polarimeter POLDER. Preliminary results are presented and discussed, especially in view of their significance concerning the applicability of perturbative QCD to this exclusive process.
Published: 1999
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13. Induced proton polarization forπ0electroproduction atQ2=0.126 GeV2/c2around theΔ(1232)resonance

Author: S. E. Williamson, X. Jiang, B. Asavapibhop, G. W. Dodson, Glen A. Warren, Larry Weinstein, A. J. Sarty, S. B. Soong, K. Joo, D. J. Margaziotis, S. Kowalski, James J. Kelly, Shalev Gilad, C. Vellidis, K. A. Dow, C. S. Armstrong, L. M. Qin, P. Markowitz, Jiunn-Wei Chen, A. Young, R. W. Gothe, D. S. Dale, Justin I. McIntyre, Volker D. Burkert, P. M. Rutt, Ricardo Alarcon, J. P. Chen, M. B. Epstein, D. Liu, R. J. Woo, C. Tschalaer, V. A. Punjabi, D. H. Barkhuff, M. K. Jones, William Bertozzi, D. R. Tieger, J. M. Finn, A. Karabarbounis, J. R. Comfort, M. Farkhondeh, S. Van Verst, B. D. Milbrath, Richard Madey, R. A. Miskimen, S. Mukhopadhyay, S. Dolfini, C. Kunz, C. F. Perdrisat, J. Shaw, Costas N. Papanicolas, P. E. Ulmer, R.W. Lourie, W. Turchinetz, John C. Mitchell, and C. Mertz
Subjects: Physics, Baryon, Nuclear and High Energy Physics, Particle physics, Pion, Proton, Meson, Hadron, Elementary particle, Nucleon, Delta baryon
Abstract: We present a measurement of the induced proton polarization ${P}_{n}$ in ${\ensuremath{\pi}}^{0}$ electroproduction on the proton around the $\ensuremath{\Delta}$ resonance. The measurement was made at a central invariant mass and a squared four-momentum transfer of $W=1231 \mathrm{MeV}$ and ${Q}^{2}=0.126 {\mathrm{GeV}}^{2}{/c}^{2},$ respectively. We measured a large induced polarization, ${P}_{n}=\ensuremath{-}0.397\ifmmode\pm\else\textpm\fi{}0.055\ifmmode\pm\else\textpm\fi{}0.009.$ The data suggest that the scalar background is larger than expected from a recent effective Hamiltonian model.
Published: 1998
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14. Prototype studies and design considerations for the CLAS Region 2 drift chambers

Author: S. E. Kuhn, Larry Weinstein, J. Yun, G. E. Dodge, L. M. Qin, T.D. Pyron, C. E. Hyde-Wright, K.G. Vansyoc, Avraham Klein, and B. A. Raue
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Toroid, Spectrometer, Magnet, Measuring instrument, Mechanical engineering, Feedthrough, Tracking (particle physics), Instrumentation, Signal, Particle detector
Abstract: The CEBAF Large Acceptance Spectrometer (CLAS) has recently been commissioned in Hall B of the Thomas Jefferson National Accelerator Facility (Jefferson Lab). The six “Region 2” drift chambers, built by Old Dominion University with technical support from Jefferson Lab, are located between the coils of the CLAS super-conducting toroidal magnet. The endplates were constructed from non-conducting fiberglass in order to eliminate eddy-current forces during possible magnet quenches. The non-conducting endplate allowed the use of compact wire connecting and signal transfer hardware, thus minimizing the loss of acceptance of the Region 2 chambers. Wires were positioned by flared trumpet-shaped metal feedthroughs that were glued directly into precision holes drilled into the endplates. We report test results from two prototype chambers. A single-cell prototype proved general functionality of the endplate/feedthrough design and showed that the active area of the chamber starts approximately 10 mm from the end of the sense wire. A 36-cell prototype achieved a tracking resolution of better than 150 μm with various gas mixtures.
Published: 1998
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15. Construction update and drift velocity calibration for the CLAS drift chamber system

Author: R. A. Miskimen, R. Magahiz, S. Dytman, Ch. Hyde-Wright, Gerard Gilfoyle, J.E. O'Meara, L. M. Qin, T.D. Pyron, E. Burtin, S. Christo, A. Yegneswaran, F. Barbosa, R. A. Schumacher, L. Y. Murphy, P. Bonneau, Avraham Klein, Larry Weinstein, G. Doolittle, B. A. Raue, W. Tuzel, S. E. Kuhn, M. D. Mestayer, and M.V. Kossov
Subjects: Physics, Nuclear and High Energy Physics, Drift velocity, Physics::Instrumentation and Detectors, business.industry, Detector, Chamber geometry, Mechanics, Function (mathematics), Key features, Cathode, Anode, law.invention, Optics, law, Calibration, business, Instrumentation
Abstract: We briefly describe the drift chamber system for the CLAS detector at CEBAF, concentrating on the method which will be used to calibrate the drift velocity function. We identify key features of the function which should apply to any small-cell drift chamber geometry in which the cathode and anode surfaces are wires. Using these ideas, we describe a simple method to compensate for variations in the drift velocity function due to environmental changes.
Published: 1995
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16. Some biochemical characteristics of a partially purified extracellular keratinase from trichophyton schoenleinii

Author: S. Dekio, J. Jidoi, and L.-M. Qin
Subjects: Sodium, Guinea Pigs, Immunology, chemistry.chemical_element, medicine.disease_cause, Substrate Specificity, Column chromatography, Trichophyton, medicine, Extracellular, Animals, Humans, chemistry.chemical_classification, Gel electrophoresis, biology, biology.organism_classification, Enzyme, chemistry, Biochemistry, Keratinase, Dermatophyte, biology.protein, Keratins, Hair, Peptide Hydrolases
Abstract: A Trichophyton schoenleinii (T. schoenleinii) strain from tinea favus was cultured in a liquid medium, from which an extracellular keratinase extract was obtained. The keratinase was partially purified with carboxymethyl-cellulose (CMC) column chromatography. Some biochemical characteristics of the keratinase were then examined. Its molecular weight was estimated to be 38,000 on sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE). The optimal temperature was 50 degrees C, and the optimal pH value was 5.5. The keratinolytic activity was specifically increased by Fe++ and Fe .
Published: 1992
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17. Precise Measurement of the Neutron Magnetic Form FactorGMnin the Few-GeV2Region

Author: R. J. Feuerbach, J. P. Cummings, L. C. Smith, E. Munevar, R. De Masi, D. Keller, M. Kossov, B. S. Ishkhanov, I. Popa, K. S. Egiyan, G. Ricco, K. Mikhailov, L. Cheng, M. Khandaker, M. Garçon, J. Shaw, Michael Wood, P. Nadel-Turonski, Nikolay Shvedunov, M. R. Niroula, K. Hafidi, R. Nasseripour, S. McAleer, Friedrich Klein, B. P. Quinn, Brian Raue, V. S. Serov, L. Casey, F. X. Girod, Susan Taylor, Marco A. Huertas, M. Lowry, V. Sapunenko, D. P. Watts, L. C. Dennis, B. E. Bonner, Hartmuth Arenhövel, Dinko Pocanic, H. Egiyan, R. G. Fersch, H. Avakian, D. Doughty, B. B. Niczyporuk, G. S. Adams, S. Park, D. Sharov, N. Kalantarians, P. L. Cole, Sylvain Bouchigny, Sabine Jeschonnek, R. C. Minehart, Kei Moriya, D. Heddle, P. Rossi, J. Lachniet, H. G. Juengst, C. A. Meyer, N. Pivnyuk, K. Joo, W. J. Briscoe, B. L. Berman, A. Tkabladze, G. V. Fedotov, E. Pasyuk, D. Rowntree, A. Coleman, L. M. Qin, M. Y. Gabrielyan, S. E. Kuhn, S. A. Dytman, V. Crede, Y. Ilieva, J. R. Calarco, T. Mineeva, J. W. Price, M. J. Amaryan, C. Paterson, S. Strauch, M. MacCormick, A.V. Stavinsky, M. Klusman, I. Hleiqawi, V. P. Kubarovsky, K. P. Adhikari, S. L. Careccia, A. Empl, L. El Fassi, O. Pogorelko, B. Moreno, D. P. Weygand, J. Salamanca, R. Suleiman, M. E. McCracken, Elton Smith, K. L. Giovanetti, B. Asavapibhop, G. V. O'Rielly, Tsutomu Mibe, Larry Weinstein, Z. W. Zhao, J. W C McNabb, D. J. Tedeschi, D. Protopopescu, D. G. Jenkins, Barry Ritchie, M. Anghinolfi, James Mueller, S. Malace, S. A. Morrow, P. Rubin, I. Bedlinskiy, G. S. Mutchler, Konstantin Stopani, S. Pozdniakov, V. Gyurjyan, M. M. Ito, C. Djalali, Y. G. Sharabian, G. Rosner, T. Kageya, K. Livingston, D. S. Dale, X. Wei, R. Dickson, V. Kuznetsov, C. E. Hyde-Wright, H. Denizli, N. Guler, N. A. Baltzell, P. Mattione, K. A. Griffioen, M. S. Saini, A. V. Skabelin, P. Dragovitsch, J. Zhang, S. Barrow, E. De Sanctis, S. Niccolai, J. T. Goetz, E. Polli, H. Bagdasaryan, R. A. Miskimen, J. D. Kellie, B. McKinnon, Sergey Kuleshov, M. Bektasoglu, J. Hardie, M. Nozar, W. Kim, Laird Kramer, G. Niculescu, D. I. Sober, D. Branford, M. Guidal, R. A. Schumacher, H. Hakobyan, M. Mirazita, P. Khetarpal, C. Hanretty, J. M. Laget, M. Holtrop, Victor Mokeev, L. Graham, J. R. Johnstone, N. Gevorgyan, L. Guo, M. Ungaro, M. Osipenko, F. Sabatié, A. Daniel, K. Beard, Kalvir S. Dhuga, S. Bültmann, A. I. Ostrovidov, J. Yun, D. Cords, V. Batourine, T. A. Forest, A. Yegneswaran, A. C S Lima, A. Sandorfi, K. Park, R. Fatemi, S. Stepanyan, A. V. Vlassov, D. G. Ireland, Volker D. Burkert, A. S. Biselli, J. Pierce, Avraham Klein, B. Zhao, J. Langheinrich, R. De Vita, A. Fradi, S. S. Stepanyan, S. A. Philips, William Brooks, N. Markov, P. Konczykowski, B. E. Stokes, J. J. Manak, S. Anefalos Pereira, G. E. Dodge, H. Y. Lu, N. Dashyan, Maryam Moteabbed, P. V. Degtyarenko, K. V. Dharmawardane, I. Niculescu, D. Lawrence, D. Schott, F. W. Hersman, M. Battaglieri, N. Baillie, P. Stoler, K. Hicks, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Corvisiero, R. Bradford, B. A. Mecking, K. Lukashin, E. Wolin, Gerard Gilfoyle, M. Guillo, D. Sokhan, W. Gohn, N. Hassall, M. Bellis, E. Golovatch, J. P. Ball, J. Hu, Y. Prok, D. S. Carman, S. Dhamija, M. D. Mestayer, L. Elouadrhiri, I. I. Strakovsky, E. L. Isupov, R. W. Gothe, G. Gavalian, S. Tkachenko, A. Deur, Michael L. Williams, J. Kuhn, N. Benmouna, J. P. Santoro, Andrei Afanasev, M. Ripani, D. G. Crabb, K. Y. Kim, Roy Thompson, Cynthia Marie Hadjidakis, S. Boiarinov, Michael Dugger, B. M. Preedom, Douglas Higinbotham, M. Yurov, Lorenzo Zana, H. S. Jo, C. Bookwalter, C. Salgado, Kwangsoo Kim, G. Riccardi, P. Eugenio, A. Starostin, M. Taiuti, Michael Vineyard, and P. Collins
Subjects: Physics, 010308 nuclear & particles physics, Scattering, Nuclear Theory, General Physics and Astronomy, Scintillator, 7. Clean energy, 01 natural sciences, Nuclear physics, Dipole, Deuterium, 0103 physical sciences, Magnetic form factor, Neutron detection, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Electron scattering
Abstract: The neutron elastic magnetic form factor was extracted from quasielastic electron scattering on deuterium over the range Q;{2}=1.0-4.8 GeV2 with the CLAS detector at Jefferson Lab. High precision was achieved with a ratio technique and a simultaneous in situ calibration of the neutron detection efficiency. Neutrons were detected with electromagnetic calorimeters and time-of-flight scintillators at two beam energies. The dipole parametrization gives a good description of the data.
Published: 2009
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18. Search for the Photoexcitation of Exotic Mesons in theπ+π+π−System

Author: M. Nozar, C. Salgado, D. P. Weygand, L. Guo, G. Adams, Ji Li, P. Eugenio, M. J. Amaryan, M. Anghinolfi, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, S. Barrow, M. Battaglieri, I. Bedlinskiy, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, A. S. Biselli, L. Blaszczyk, B. E. Bonner, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, B. Carnahan, L. Casey, A. Cazes, S. Chen, L. Cheng, P. L. Cole, P. Collins, P. Coltharp, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, V. Crede, J. P. Cummings, D. Dale, N. Dashyan, R. De Masi, R. De Vita, E. De Sanctis, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deur, K. V. Dharmawardane, K. S. Dhuga, R. Dickson, C. Djalali, G. E. Dodge, D. Doughty, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. El Fassi, L. Elouadrhiri, R. Fatemi, G. Fedotov, R. J. Feuerbach, T. A. Forest, A. Fradi, H. Funsten, M. Garçon, G. Gavalian, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, R. W. Gothe, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, V. Gyurjyan, C. Hadjidakis, K. Hafidi, H. Hakobyan, C. Hanretty, J. Hardie, N. Hassall, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, C. E. Hyde-Wright, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, M. M. Ito, D. Jenkins, H. S. Jo, J. R. Johnstone, K. Joo, H. G. Juengst, N. Kalantarians, J. D. Kellie, M. Khandaker, W. Kim, A. Klein, F. J. Klein, M. Kossov, Z. Krahn, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, S. V. Kuleshov, V. Kuznetsov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, K. Livingston, H. Y. Lu, M. MacCormick, N. Markov, P. Mattione, S. McAleer, B. McKinnon, J. W. C. McNabb, B. A. Mecking, S. Mehrabyan, M. D. Mestayer, C. A. Meyer, T. Mibe, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, B. Moreno, K. Moriya, S. A. Morrow, M. Moteabbed, J. Mueller, E. Munevar, G. S. Mutchler, P. Nadel-Turonski, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, M. R. Niroula, R. A. Niyazov, G. V. O’Rielly, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. Anefalos Pereira, S. A. Philips, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, I. Popa, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, P. D. Rubin, F. Sabatié, J. Salamanca, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, D. Sharov, N. V. Shvedunov, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, D. Sokhan, A. Stavinsky, S. S. Stepanyan, S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, D. J. Tedeschi, U. Thoma, A. Tkabladze, S. Tkachenko, L. Todor, M. Ungaro, M. F. Vineyard, A. V. Vlassov, D. P. Watts, L. B. Weinstein, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, L. Zana, J. Zhang, B. Zhao, and Z. W. Zhao
Subjects: Quantum chromodynamics, Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Bremsstrahlung, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Nuclear physics, Excited state, 0103 physical sciences, Isobar, Production (computer science), 010306 general physics, Spin-½
Abstract: A search for exotic mesons in the $$\pi^{+}\pi^{+}\pi^{-}$$ system photoproduced by the charge exchange reaction $$\gamma p\to \pi^{+}\pi^{+}\pi^{-}(n)$$ was carried out by the CLAS collaboration at Jefferson Lab. A tagged-photon beam with energies in the 4.8 to 5.4 GeV range, produced through bremsstrahlung from a 5.744 GeV electron beam, was incident on a liquid-hydrogen target. A Partial Wave Analysis (PWA) was performed on a sample of 83,000 events, the highest such statistics to date in this reaction at these energies. The main objective of this study was to look for the photoproduction of an exotic $$J^{PC} = 1^{-+}$$ resonant state in the 1 to 2 GeV mass range. Our PWA analysis, based on the isobar model, shows production of the $$a_{2}(1320)$$ and the $$\pi_{2}(1670)$$ mesons, but no evidence for the $$a_{1}(1260)$$, nor the $$\pi_{1}(1600)$$ exotic state at the expected levels. An upper limit of 13.5 nb is determined for the exotic $$\pi_1(1600)$$ cross section, less than 2% of the $a_2(1320)
Published: 2009
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19. Measurement of semi-inclusive pi+ electroproduction off the proton

Author: L. C. Smith, E. Munevar, M. H. Wood, Y. Ilieva, M. E. McCracken, P. Nadel-Turonski, E. Wolin, R. J. Feuerbach, B. S. Ishkhanov, G. E. Dodge, Tsutomu Mibe, P. V. Degtyarenko, J. P. Ball, Y. Prok, D. S. Carman, M. R. Niroula, Alexander Ilyichev, O. P. Dzyubak, I. I. Strakovsky, Paolo Rossi, K. S. Egiyan, P. L. Cole, Z. W. Zhao, J. Lachniet, A. Tkabladze, W. Kim, I. Niculescu, R. A. Niyazov, D. G. Crabb, R. S. Hakobyan, L. El Fassi, Elton Smith, A. Deur, G. Niculescu, R. De Masi, B. L. Berman, J. Kuhn, B. McKinnon, W. K. Brooks, G. P. Gilfoyle, K. Livingston, R. Fatemi, N. Markov, A. V. Vlassov, J. P. Cummings, M. Anghinolfi, G. Ricco, B. Zhao, D. J. Tedeschi, S. Niccolai, R. Dickson, Ji Li, Y. G. Sharabian, S. Strauch, D. P. Watts, H. Egiyan, L. M. Qin, C. Paterson, L. Zana, D. Branford, J. M. Laget, M. Khandaker, G. Riccardi, N. Hassall, M. Bellis, Cynthia Marie Hadjidakis, R. De Vita, A. I. Ostrovidov, K. A. Griffioen, N. Guler, F. W. Hersman, J. Hardie, C. Butuceanu, M. J. Amaryan, M. Kossov, Shifeng Chen, E. N. Golovach, Volker D. Burkert, A. S. Biselli, Michael Dugger, J. Langheinrich, H. O. Funsten, H. G. Juengst, Luca Trentadue, M. MacCormick, I. Hleiqawi, M. D. Mestayer, C. Djalali, H. Denizli, P. Eugenio, S. Dytman, A. V. Skabelin, S. L. Careccia, I. Popa, P. Coltharp, R. A. Schumacher, P. Mattione, M. Osipenko, S. Barrow, M. Taiuti, A.V. Stavinsky, S. Anefalos Pereira, P. D. Rubin, R. W. Gothe, Laird Kramer, E. L. Isupov, D. Lawrence, D. Sokhan, M. M. Ito, H. Hakobyan, A. Cazes, J. R. Calarco, C. I O Gordon, K. L. Giovanetti, S. Mehrabyan, Alexei V. Klimenko, J. T. Goetz, R. Miskimen, C. Hanretty, G. V. O'Rielly, E. Polli, Michael L. Williams, Larry Weinstein, M. Mirazita, Kalvir S. Dhuga, J. D. Kellie, P. Collins, Friedrich Klein, F. Sabatié, Nikolay Shvedunov, J. J. Melone, V. Sapunenko, Sylvain Bouchigny, S. Bültmann, L. Todor, Barry Ritchie, Dinko Pocanic, Victor Mokeev, Brian Raue, G. Asryan, E. De Sanctis, M. Battaglieri, I. Bedlinskiy, V. A. Drozdov, S. Stepanyan, S. E. Kuhn, N. A. Baltzell, D. Protopopescu, S. Pozdniakov, M. Garçon, M. F. Vineyard, J. Pierce, Avraham Klein, Z. Krahn, N. Dashyan, S. Boiarinov, U. Thoma, D. I. Sober, R. Bradford, N. Kalantarians, Latifa Elouadrhiri, V. Gyurjyan, G. S. Mutchler, D. G. Ireland, V. Crede, N. Baillie, B. B. Niczyporuk, R. C. Minehart, Kei Moriya, S. McAleer, N. Pivnyuk, B. E. Stokes, J. Napolitano, G. S. Adams, J. Zhang, B. M. Preedom, F. X. Girod, L. Blaszczyk, H. Bagdasaryan, J. P. Santoro, C. Tur, C. A. Meyer, L. Guo, M. Ungaro, G. Gavalian, J. Donnelly, S. Tkachenko, D. Heddle, J. Salamanca, N. Benmouna, G. V. Fedotov, M. Ripani, J. W C McNabb, D. Jenkins, R. Nasseripour, S. A. Morrow, K. Joo, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, A. Yegneswaran, Atilla Gonenc, P. Ambrozewicz, J. W. Price, M. Holtrop, D. P. Weygand, P. Corvisiero, H. S. Jo, Gerald Feldman, Federico A. Ceccopieri, C. Salgado, G. Rosner, M. Guillo, K. Mikhailov, M. Guidal, H. Y. Lu, C. E. Hyde-Wright, P. Stoler, Sergey Kuleshov, M. Bektasoglu, M. Nozar, K. Hicks, S. S. Stepanyan, S. A. Philips, J. Mueller, K. Hafidi, V. S. Serov, K. Park, V. P. Kubarovsky, O. Pogorelko, L. C. Dennis, B. E. Bonner, H. Avakian, W. J. Briscoe, E. Pasyuk, D. Doughty, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Particle physics, Nuclear and High Energy Physics, Proton, DEEP-INELASTIC-SCATTERING, TARGET FRAGMENTATION REGION, TRANSVERSE-MOMENTUM, PARTON DISTRIBUTIONS, AZIMUTHAL ASYMMETRY, PION ELECTROPRODUCTION, CHARGED HADRONS, HARD PROCESSES, LEADING ORDER, CROSS-SECTION, TARGET FRAGMENTATION REGION, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Spectral line, Nuclear physics, Pion, Factorization, 0103 physical sciences, 010306 general physics, Nuclear Experiment, PION ELECTROPRODUCTION, Physics, DEEP-INELASTIC-SCATTERING, 010308 nuclear & particles physics, LEADING ORDER, TRANSVERSE-MOMENTUM, Azimuth, Diquark, CHARGED HADRONS, HARD PROCESSES, PARTON DISTRIBUTIONS, Cathode ray, AZIMUTHAL ASYMMETRY, High Energy Physics::Experiment, CROSS-SECTION
Abstract: Semi-inclusive {pi}{sup +} electroproduction on protons has been measured with the CLAS detector at Jefferson Lab. The measurement was performed on a liquid-hydrogen target using a 5.75 GeV electron beam. The complete five-fold differential cross sections were measured over a wide kinematic range including the complete range of azimuthal angles between hadronic and leptonic planes, {phi}, enabling us to separate the {phi}-dependent terms. Our measurements of the {phi}-independent term of the cross section at low Bjorken x were found to be in fairly good agreement with pQCD calculations. Indeed, the conventional current fragmentation calculation can account for almost all of the observed cross section, even at small {pi}{sup +} momentum. The measured center-of-momentum spectra are in qualitative agreement with high-energy data, which suggests a surprising numerical similarity between the spectator diquark fragmentation in the present reaction and the antiquark fragmentation measured in e{sup +}e{sup -} collisions. We have observed that the two {phi}-dependent terms of the cross section are small. Within our precision the cos2{phi} term is compatible with zero, except for the low-z region, and the measured cos{phi} term is much smaller in magnitude than the sum of the Cahn and Berger effects.
Published: 2009
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20. Electroexcitation of the Roper resonance for1.7<Q2<4.5GeV2ine→p→enπ+

Author: B. Zhao, F. W. Hersman, Marco Ripani, S. Dhamija, R. W. Gothe, K. Y. Kim, J. Kuhn, J. P. Santoro, E. De Sanctis, Latifa Elouadrhiri, B. M. Preedom, P. Eugenio, R. C. Minehart, Kei Moriya, D. I. Sober, M. Taiuti, G. Rosner, C. A. Meyer, M. Battaglieri, G. V. Fedotov, P. Collins, J. J. Melone, Lorenzo Zana, R. Bradford, K. Lukashin, J. Shaw, V. Batourine, D. P. Weygand, H. Hakobyan, Friedrich Klein, H. S. Jo, Michael Wood, K. Hafidi, Brian Raue, Gerald Feldman, Elton Smith, R. Fatemi, V. S. Serov, A. V. Vlassov, T. Lee, M. Anghinolfi, P. Coltharp, James Mueller, I. I. Strakovsky, N. A. Baltzell, R. De Vita, P. D. Rubin, A. Cazes, Maryam Moteabbed, C. Salgado, Bernhard Mecking, Y. G. Sharabian, A. Deur, K. A. Griffioen, K. S. Egiyan, K. V. Dharmawardane, Baile Zhang, Alexei V. Klimenko, S. Anefalos Pereira, Z. Krahn, W. K. Brooks, Shifeng Chen, J. D. Kellie, Y. Prok, N. Hassall, M. Bellis, J. Langheinrich, Barry Ritchie, N. Baillie, P. Mattione, M. S. Saini, L. C. Dennis, B. E. Bonner, S. S. Stepanyan, S. A. Philips, R. A. Miskimen, B. McKinnon, H. Avakian, J. T. Goetz, E. Polli, B. L. Berman, D. Sharov, M. Mirazita, D. Branford, K. Livingston, D. S. Dale, Ji Li, L. M. Qin, J. M. Laget, H. Denizli, N. Gevorgyan, C. Paterson, G. Gavalian, W. J. Briscoe, E. Pasyuk, S. Tkachenko, M. D. Mestayer, S. A. Dytman, J. Donnelly, G. Asryan, A. V. Skabelin, N. Benmouna, Gerard Gilfoyle, O. P. Dzyubak, R. A. Niyazov, E. L. Isupov, A. Fradi, D. Sokhan, M. Guillo, V. Crede, Michael L. Williams, W. Gohn, N. Markov, V. Sapunenko, Dinko Pocanic, J. R. Calarco, P. Corvisiero, E. Golovatch, S. Boiarinov, S. E. Kuhn, Charles Hyde, V. P. Kubarovsky, O. Pogorelko, C. Tur, M. J. Amaryan, M. MacCormick, I. Hleiqawi, R. Nasseripour, S. L. Careccia, S. McAleer, F. X. Girod, Laird Kramer, B. E. Stokes, G. S. Adams, J. P. Cummings, Cynthia Marie Hadjidakis, G. E. Dodge, H. Y. Lu, K. L. Giovanetti, L. Blaszczyk, P. V. Degtyarenko, M. Kossov, V. Gyurjyan, K. Joo, I. Popa, Sergey Kuleshov, M. Bektasoglu, Michael Dugger, D. Heddle, M. Nozar, P. Stoler, I. Niculescu, D. Lawrence, J. Zhang, R. De Masi, D. Schott, S. A. Morrow, C. Djalali, R. A. Schumacher, M. Guidal, Larry Weinstein, K. Hicks, M. Holtrop, L. Graham, H. Bagdasaryan, C. I O Gordon, P. Ambrozewicz, S. Bültmann, L. Morand, T. A. Forest, S. Stepanyan, J. Pierce, Avraham Klein, K. Mikhailov, L. Cheng, Nikolay Shvedunov, A. I. Ostrovidov, L. Casey, A. C S Lima, K. Park, N. Kalantarians, B. B. Niczyporuk, D. G. Ireland, Michael Vineyard, N. Pivnyuk, Giovanni Ricco, Atilla Gonenc, E. Wolin, Volker D. Burkert, A. S. Biselli, J. P. Ball, D. S. Carman, D. G. Crabb, J. Salamanca, J. W C McNabb, M. Yurov, J. W. Price, S. Mehrabyan, C. Bookwalter, G. Riccardi, H. Funsten, P. Nadel-Turonski, C. Butuceanu, Tsutomu Mibe, N. Dashyan, K. Hafnaoui, C. Hanretty, G. V. O'Rielly, J. R. Johnstone, Z. W. Zhao, D. Keller, Paolo Rossi, D. G. Jenkins, J. Lachniet, A. Tkabladze, S. Park, Sylvain Bouchigny, D. Rowntree, M. M. Ito, R. S. Hakobyan, L. El Fassi, M. Khandaker, H. G. Juengst, A.V. Stavinsky, D. J. Tedeschi, V. Mokeev, I. Bedlinskiy, L. C. Smith, E. Munevar, B. S. Ishkhanov, M. R. Niroula, V. Kuznetsov, S. Strauch, R. Suleiman, L. Guo, G. S. Mutchler, M. Ungaro, S. Niccolai, J. Hardie, D. Doughty, W. Kim, D. P. Watts, G. Niculescu, J. Yun, D. Cords, H. Egiyan, T. Takeuchi, A. Yegneswaran, M. Osipenko, F. Sabatié, Kalvir S. Dhuga, M. Y. Gabrielyan, R. Dickson, R. J. Feuerbach, N. Guler, Inna Aznauryan, P. L. Cole, S. Barrow, L. Todor, D. Protopopescu, S. Pozdniakov, M. Garçon, Y. Ilieva, and B. Moreno
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Roper resonance, Meson production, 010308 nuclear & particles physics, State (functional analysis), 01 natural sciences, Helicity, Baryon, 0103 physical sciences, Pi, Isobar, 010306 general physics, Ground state
Abstract: The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for $1.7l{Q}^{2}l4.5\phantom{\rule{0.3em}{0ex}}{\mathrm{GeV}}^{2}$ from recent high precision JLab-CLAS cross section and longitudinally polarized beam asymmetry data for ${\ensuremath{\pi}}^{+}$ electroproduction on protons at $W=1.15\ensuremath{-}1.69$ GeV. The analysis is made using two approaches, dispersion relations and a unitary isobar model, which give consistent ${Q}^{2}$ behavior of the helicity amplitudes for the ${\ensuremath{\gamma}}^{*}p\ensuremath{\rightarrow}$N(1440)P${}_{11}$ transition. It is found that the transverse helicity amplitude ${A}_{1/2}$, which is large and negative at ${Q}^{2}=0$, becomes large and positive at ${Q}^{2}\ensuremath{\simeq}2\phantom{\rule{0.3em}{0ex}}{\mathrm{GeV}}^{2}$, and then drops slowly with ${Q}^{2}$. The longitudinal helicity amplitude ${S}_{1/2}$, which was previously found from CLAS $\stackrel{\ensuremath{\rightarrow}}{e}p\ensuremath{\rightarrow}\mathit{ep}{\ensuremath{\pi}}^{0},\mathit{en}{\ensuremath{\pi}}^{+}$ data to be large and positive at ${Q}^{2}=0.4,0.65\phantom{\rule{0.3em}{0ex}}{\mathrm{GeV}}^{2}$, drops with ${Q}^{2}$. Available model predictions for ${\ensuremath{\gamma}}^{*}p\ensuremath{\rightarrow}$N(1440)P${}_{11}$ allow us to conclude that these results provide strong evidence in favor of N(1440)P${}_{11}$ as a first radial excitation of the $3q$ ground state. The results of the present paper also confirm the conclusion of our previous analysis for ${Q}^{2}l1$ GeV${}^{2}$ that the presentation of N(1440)P${}_{11}$ as a q$^{3}\mathrm{G}$ hybrid state is ruled out.
Published: 2008
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21. Charged pion form factor betweenQ2=0.60and2.45 GeV2. II. Determination of, and results for, the pion form factor

Author: C. E. Keppel, D. J. Margaziotis, L. M. Qin, S. Vidakovic, John C. Mitchell, B. Zihlmann, T. Eden, V. Tadevosyan, Y. Okayasu, J. Arrington, D. H. Potterveld, J. Roche, Toshinobu Miyoshi, D. van Westrum, B. Mueller, K. A. Aniol, G. Niculescu, E. J. Brash, S. A. Wood, Ketevi Assamagan, K. Vansyoc, P. H. Kim, W. Zhao, D. McKee, H. C. Fenker, W.U. Boeglin, C. S. Armstrong, D. J. Mack, A. Matsumura, Stephen Avery, E. J. Beise, H. E. Jackson, D. Pitz, C. Xu, G. J. Lolos, A. J. Sarty, C. Yan, Andreas Klein, Jin Liu, M. E. Christy, P. E. Reimer, X. Zheng, I. K. Shin, J. Reinhold, E. F. Gibson, W. F. Vulcan, W. Hinton, S. Stepanyan, P. G. Roos, Ronald Gilman, C. C. Chang, R. van der Meer, D. Abbott, D. Gaskell, M. K. Jones, I. Niculescu, C. F. Perdrisat, Brynle Barrett, V. Kovaltchouk, H. Mkrtchyan, V. Tvaskis, A. F. Lung, Lubomir Pentchev, H. Anklin, Oliver Keith Baker, Geoffrey Smith, Pete Markowitz, Rolf Ent, Glen A. Warren, K. Gustafsson, M. Liang, C. Bochna, J. Volmer, G. M. Huber, P. M. King, D. Koltenuk, H. P. Blok, J. A. Dunne, L. G. Tang, V. A. Punjabi, D. G. Meekins, S. Jin, W. Kim, N. S. Chant, H. Breuer, Tanja Horn, and R. J. Holt
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Particle physics, Bethe–Salpeter equation, 010308 nuclear & particles physics, Hadron, Lattice field theory, Magnetic monopole, Form factor (quantum field theory), Sigma, Particle accelerator, 7. Clean energy, 01 natural sciences, Charged particle, law.invention, Nuclear physics, Pion, law, Charge radius, 0103 physical sciences, Neutron, Invariant mass, Nucleon, 010306 general physics
Abstract: Cross sections for the reaction {sup 1}H(e,e'{Pi}{sup +})n were measured in Hall C at Thomas Jefferson National Accelerator Facility (JLab) using the high-intensity Continuous Electron Beam Accelerator Facility (CEBAF) to determine the charged pion form factor. Data were taken for central four-momentum transfers ranging from Q{sup 2} = 0.60 to 2.45 GeV{sup 2} at an invariant mass of the virtual photon-nucleon system of W = 1.95 and 2.22 GeV. The measured cross sections were separated into the four structure functions {sigma}{sub L},{sigma}{sub T}, {sigma}{sub LT}, and {sigma}{sub TT}. The various parts of the experimental setup and the analysis steps are described in detail, including the calibrations and systematic studies, which were needed to obtain high-precision results. The different types of systematic uncertainties are also discussed. The results for the separated cross sections as a function of the Mandelstam variable t at the different values of Q{sup 2} are presented. Some global features of the data are discussed, and the data are compared with the results of some model calculations for the reaction {sup 1}H(e,e'{Pi}{sup +})n.
Published: 2008
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22. Electroproduction ofϕ(1020)mesons at1.4⩽Q2⩽3.8GeV2measured with the CLAS spectrometer

Author: M. Guidal, R. Nasseripour, M. Holtrop, I. I. Strakovsky, R. J. Feuerbach, G. V. O'Rielly, Cynthia Marie Hadjidakis, B. Zhao, Z. W. Zhao, D. G. Jenkins, Alexei V. Klimenko, R. De Masi, A. Deur, Michael Dugger, H. O. Funsten, Michael Wood, K. Hafidi, N. Dashyan, B. E. Stokes, G. S. Adams, Barry Ritchie, P. L. Cole, B. M. Preedom, V. S. Serov, C. E. Hyde-Wright, S. McAleer, J. Langheinrich, S. S. Stepanyan, S. A. Philips, L. Blaszczyk, G. Ricco, J. Ball, F. W. Hersman, Sergey Kuleshov, Lorenzo Zana, J. P. Santoro, M. Bektasoglu, M. Nozar, M. Garçon, Elton Smith, M. Battaglieri, J. Salamanca, J. Lachniet, A. Tkabladze, Latifa Elouadrhiri, P. Coltharp, H. Hakobyan, F. Sabatié, H. S. Jo, K. Livingston, D. S. Dale, J. W C McNabb, J. R. Ficenec, N. A. Baltzell, V. Kuznetsov, R. Bradford, R. C. Minehart, Kei Moriya, C. A. Meyer, J. W. Price, M. M. Ito, S. Strauch, V. Mokeev, C. Salgado, L. Cheng, B. L. Berman, L. M. Qin, D. P. Watts, H. Egiyan, K. A. Griffioen, J. P. Cummings, V. Gyurjyan, G. V. Fedotov, S. A. Morrow, M. Anghinolfi, E. De Sanctis, V. P. Kubarovsky, D. Keller, Nikolay Shvedunov, Friedrich Klein, R. Dickson, James Mueller, C. Paterson, D. I. Sober, O. Pogorelko, C. Djalali, E. Munevar, D. P. Weygand, L. C. Smith, M. Kossov, L. C. Dennis, J. Zhang, B. E. Bonner, H. Avakian, Ji Li, M. Guillo, Brian Raue, S. Niccolai, I. Popa, S. Dhamija, N. Hassall, M. Bellis, H. Bagdasaryan, F. X. Girod, B. S. Ishkhanov, S. Park, R. Fatemi, N. Kalantarians, W. Gohn, A. V. Vlassov, J. R. Johnstone, D. Sharov, M. D. Mestayer, Y. G. Sharabian, Sylvain Bouchigny, J. Hardie, H. G. Juengst, J. Kuhn, L. El Fassi, C. Marchand, G. Audit, E. Wolin, H. Denizli, E. L. Isupov, R. De Vita, J. D. Kellie, L. Morand, Michael L. Williams, P. Rossi, N. Guler, William Brooks, Christian Weiss, A.V. Stavinsky, M. R. Niroula, R. W. Gothe, S. Boiarinov, W. Kim, M. Mirazita, W. J. Briscoe, L. Casey, G. Gavalian, C. Hanretty, S. Tkachenko, S. Anefalos Pereira, G. Niculescu, P. Nadel-Turonski, N. Benmouna, J. P. Ball, Tsutomu Mibe, Y. Prok, D. S. Carman, A. V. Skabelin, A. Cazes, Maryam Moteabbed, Hall Crannell, Bernhard Mecking, D. J. Tedeschi, M. Ripani, E. Pasyuk, V. Crede, Shifeng Chen, G. Rosner, K. V. Dharmawardane, J. R. Calarco, S. A. Dytman, I. Bedlinskiy, B. B. Niczyporuk, L. Guo, M. Ungaro, N. Pivnyuk, D. G. Crabb, R. A. Schumacher, M. Khandaker, S. Barrow, P. Mattione, M. S. Saini, P. Eugenio, M. Taiuti, K. Joo, G. S. Mutchler, Michael Vineyard, D. Cords, L. Graham, C. I O Gordon, A. Yegneswaran, M. Yurov, J. T. Goetz, S. Mehrabyan, S. Bültmann, V. Sapunenko, P. Collins, Dinko Pocanic, J. J. Melone, M. Osipenko, S. Procureur, T. A. Forest, C. Bookwalter, G. Riccardi, S. Stepanyan, S. E. Kuhn, Kalvir S. Dhuga, C. Butuceanu, J. Pierce, Avraham Klein, C. Tur, G. E. Dodge, L. Todor, H. Y. Lu, P. V. Degtyarenko, M. J. Amaryan, D. Protopopescu, M. MacCormick, I. Hleiqawi, S. Pozdniakov, I. Niculescu, D. Lawrence, S. L. Careccia, D. Schott, K. L. Giovanetti, Larry Weinstein, D. Doughty, D. Heddle, Y. Ilieva, B. Moreno, R. A. Miskimen, B. McKinnon, D. Branford, J. M. Laget, N. Gevorgyan, A. I. Ostrovidov, K. Park, D. G. Ireland, Volker D. Burkert, A. S. Biselli, Z. Krahn, N. Baillie, Laird Kramer, Gerard Gilfoyle, D. Sokhan, A. Fradi, N. Markov, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Corvisiero, K. S. Egiyan, K. Mikhailov, P. Stoler, and K. Hicks
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Vector meson dominance, 01 natural sciences, Helicity, Gluon, 0103 physical sciences, Exponent, Vector meson, 010306 general physics, Nucleon, Exchange model
Abstract: Electroproduction of exclusive \ensuremath{\phi} vector mesons has been studied with the CLAS detector in the kinematic range $1.4\ensuremath{\leqslant}{Q}^{2}\ensuremath{\leqslant}3.8$ GeV${}^{2},0.0\ensuremath{\leqslant}{t}^{'}\ensuremath{\leqslant}3.6$ GeV${}^{2}$, and $2.0\ensuremath{\leqslant}W\ensuremath{\leqslant}3.0$ GeV. The scaling exponent for the total cross section as $1/({Q}^{2}+{M}_{\ensuremath{\phi}}^{2}){}^{n}$ was determined to be $n=2.49\ifmmode\pm\else\textpm\fi{}0.33$. The slope of the four-momentum transfer ${t}^{'}$ distribution is ${b}_{\ensuremath{\phi}}=0.98\ifmmode\pm\else\textpm\fi{}0.17$ GeV${}^{\ensuremath{-}2}$. Under the assumption of $s$-channel helicity conservation, we determine the ratio of longitudinal to transverse cross sections to be $R=0.86\ifmmode\pm\else\textpm\fi{}0.24$. A two-gluon exchange model is able to reproduce the main features of the data.
Published: 2008
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23. Ratios ofN15/C12andHe4/C12inclusive electroproduction cross sections in the nucleon resonance region

Author: K. S. Egiyan, L. Guo, K. Mikhailov, Calarco, P. Stoler, K. Hicks, Susan Taylor, M. Ungaro, C. D. Keith, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, H. Egiyan, P. Corvisiero, C. E. Hyde-Wright, Y. Ilieva, R. A. Miskimen, G. Ricco, M. Amarian, E. Wolin, B. Zhao, B. McKinnon, R. Fatemi, S. Strauch, Laird Kramer, K. Park, B. B. Niczyporuk, P. Dragovitsch, Nikolay Shvedunov, J. P. Ball, Y. Prok, D. S. Carman, K. Joo, L. M. Qin, R. Suleiman, D. Branford, N. Pivnyuk, Shifeng Chen, A. V. Vlassov, Sergey Kuleshov, J. Yun, D. Cords, M. Mirazita, D. G. Crabb, J. M. Laget, M. Bektasoglu, G. S. Mutchler, S. Niccolai, A. Yegneswaran, M. Battaglieri, Niroula, A. Fradi, M. Nozar, N. A. Baltzell, J. Hardie, P. Eugenio, H. G. Juengst, S. A. Morrow, R. De Vita, O. Pogorelko, C. Djalali, Kubarovsky, C. Paterson, Friedrich Klein, K. A. Griffioen, R. J. Feuerbach, N. Markov, K. Livingston, M. Klusman, M. Taiuti, A.V. Stavinsky, N. Kalantarians, Brian Raue, F. W. Hersman, R. Bradford, K. Lukashin, Marco A. Huertas, D. J. Tedeschi, J. Langheinrich, A. I. Ostrovidov, A. C S Lima, J. T. Goetz, J. Shaw, E. Polli, S. S. Stepanyan, Crede, S. A. Philips, P. Collins, D. G. Ireland, Michael Wood, K. Hafidi, I. Bedlinskiy, Batourine, Elton Smith, Gerard Gilfoyle, Mestayer, Volker D. Burkert, V. S. Serov, L. C. Dennis, A. S. Biselli, N. Guler, B. E. Bonner, H. Avakian, B. Carnahan, G. Gavalian, S. Tkachenko, M. Anghinolfi, N. Benmouna, M. Ripani, Kwangsoo Kim, J. Kuhn, J. Zhang, S Anefalos, R. W. Gothe, G. Riccardi, A. Cazes, James Mueller, J. W C McNabb, Maryam Moteabbed, Bernhard Mecking, J. D. Kellie, S. Barrow, C. Butuceanu, K. V. Dharmawardane, E. Pasyuk, H. Bagdasaryan, Mokeev, Cynthia Marie Hadjidakis, E. De Sanctis, P. D. Rubin, K. Y. Kim, Y. G. Sharabian, M. Guidal, S. A. Dytman, R. G. Fersch, Michael Dugger, H. O. Funsten, L. Todor, N. Baillie, D. I. Sober, D. Protopopescu, M. Holtrop, S. Pozdniakov, M. Garçon, Hong Lu, Sbr Ultmann, Dinko Pocanic, Sylvain Bouchigny, P. L. Cole, P. Rossi, S. E. Kuhn, M. Bellis, J. Lachniet, H. Denizli, A. Tkabladze, D. Rowntree, Sapunenko, R. S. Hakobyan, A. V. Skabelin, P. Nadel-Turonski, Tsutomu Mibe, R. C. Minehart, C. A. Meyer, G. V. Fedotov, B. E. Stokes, G. S. Adams, D. P. Weygand, U. Thoma, M. Khandaker, L. C. Smith, B. S. Ishkhanov, D. Doughty, D. Heddle, Gyurjyan, W. Kim, S. Stepanyan, G. Niculescu, M. MacCormick, I. Hleiqawi, G. Rosner, R. Nasseripour, P. Bosted, S. L. Careccia, K. L. Giovanetti, Larry Weinstein, P. Coltharp, M. M. Ito, M. Osipenko, F. Sabatié, M. Guillo, K. Beard, L. Elouadrhiri, A. Deur, W. K. Brooks, R. A. Schumacher, G. V. O'Rielly, E. Golovatch, L. Morand, T. A. Forest, J. Pierce, Avraham Klein, Z. W. Zhao, J. P. Cummings, Hall Crannell, M. Kossov, D. G. Jenkins, G. E. Dodge, P. V. Degtyarenko, S. McAleer, F. X. Girod, I. Niculescu, D. Lawrence, J. W. Price, R. De Masi, Ji Li, E. L. Isupov, Michael L. Williams, S. Boiarinov, Michael Vineyard, B. M. Preedom, Lorenzo Zana, J. P. Santoro, H. S. Jo, and C. Salgado
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, Hadron, Carbon-12, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Baryon, Helium-4, 0103 physical sciences, Phenomenological model, Atomic physics, 010306 general physics, Nucleon
Abstract: The (W,Q{sup 2}) dependence of the ratio of inclusive electron scattering cross sections for {sup 15}N/{sup 12}C was determined in the kinematic ranges 0.8
Published: 2008
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24. Polarized structure functionσLT'forH1(e→,e'K+)Λin the nucleon resonance region

Author: L. C. Dennis, B. E. Bonner, S. McAleer, F. X. Girod, L. Blaszczyk, H. Avakian, D. Sharov, D. Lawrence, P. Stoler, K. Hicks, K. S. Egiyan, Laird Kramer, D. Doughty, L. C. Smith, E. Munevar, V. Mokeev, K. Mikhailov, Elton Smith, J. Langheinrich, S. S. Stepanyan, S. A. Philips, W. J. Briscoe, E. Pasyuk, B. S. Ishkhanov, D. P. Watts, S. A. Dytman, R. A. Schumacher, P. Eugenio, D. Heddle, H. Egiyan, J. W. Price, M. F. Vineyard, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Nadel-Turonski, Tsutomu Mibe, H. G. Juengst, P. Corvisiero, E. Wolin, M. Taiuti, M. Anghinolfi, M. Kossov, James Mueller, E. De Sanctis, M. R. Niroula, J. P. Ball, M. Battaglieri, Y. Ilieva, P. D. Rubin, Y. G. Sharabian, A.V. Stavinsky, D. S. Carman, Patrick Girard, W. Kim, T. A. Forest, G. Niculescu, J. Lachniet, D. I. Sober, R. J. Feuerbach, Michael Wood, A. I. Ostrovidov, V. Sapunenko, L. Casey, Dinko Pocanic, R. Bradford, K. Lukashin, D. J. Tedeschi, K. Park, C. Hanretty, S. Stepanyan, K. Hafidi, D. G. Crabb, J. Pierce, V. S. Serov, S. E. Kuhn, Avraham Klein, E. Anciant, B. E. Stokes, B. B. Niczyporuk, I. Bedlinskiy, G. Ricco, D. G. Ireland, B. Moreno, G. E. Dodge, H. Y. Lu, P. V. Degtyarenko, N. Pivnyuk, Volker D. Burkert, A. S. Biselli, G. Audit, C. E. Hyde-Wright, R. Fatemi, A. V. Vlassov, R. De Vita, Z. W. Zhao, V. Kuznetsov, K. Joo, S. Procureur, Maryam Moteabbed, B. Zhao, D. G. Jenkins, Bernhard Mecking, Z. Krahn, Shifeng Chen, D. Sayre, S. Strauch, P. Collins, D. Protopopescu, I. Niculescu, M. Khandaker, S. Pozdniakov, Sylvain Bouchigny, J. J. Manak, P. Rossi, N. Baillie, S. Anefalos Pereira, A. Fradi, C. Cetina, A. Shafi, P. Dragovitsch, P. Mattione, Friedrich Klein, Kwangsoo Kim, R. A. Miskimen, B. McKinnon, V. P. Kubarovsky, G. Riccardi, J. Salamanca, Sergey Kuleshov, M. Osipenko, R. De Masi, Brian Raue, D. Branford, M. Mirazita, J. M. Laget, J. W C McNabb, S. A. Morrow, C. Djalali, G. S. Mutchler, M. Bektasoglu, S. Niccolai, F. Sabatié, N. Gevorgyan, C. Butuceanu, K. Beard, F. W. Hersman, N. A. Baltzell, J. T. Goetz, K. Livingston, D. S. Dale, N. Markov, O. Pogorelko, P. Coltharp, V. Crede, K. A. Griffioen, R. Dickson, J. Hardie, M. J. Amaryan, Kalvir S. Dhuga, P. Ambrozewicz, Gerard Gilfoyle, M. Nozar, D. Sokhan, M. MacCormick, M. Bellis, I. Hleiqawi, M. M. Ito, S. L. Careccia, J. Kuhn, R. W. Gothe, G. Gavalian, N. Guler, J. R. Calarco, G. A. Peterson, S. Simionatto, J. D. Kellie, S. Taylor, S. Tkachenko, K. Y. Kim, K. L. Giovanetti, B. Asavapibhop, J. P. Santoro, Roy Thompson, Larry Weinstein, S. Barrow, N. Benmouna, M. Ripani, M. Guidal, M. Guillo, L. Cheng, M. D. Mestayer, G. Rosner, R. Nasseripour, Nikolay Shvedunov, J. Hu, E. L. Isupov, L. Elouadrhiri, M. Holtrop, Michael L. Williams, S. Boiarinov, I. I. Strakovsky, B. M. Preedom, A. Deur, Lorenzo Zana, N. Kalantarians, H. Hakobyan, H. S. Jo, Gerald Feldman, Michael Dugger, W. K. Brooks, K. Wang, H. O. Funsten, C. Salgado, B. L. Berman, L. M. Qin, C. Paterson, Thierry Auger, M. Garçcon, J. R. Johnstone, V. Gyurjyan, J. Zhang, H. Bagdasaryan, L. Guo, M. Ungaro, A. Tkabladze, J. Yun, D. Cords, L. El Fassi, A. Yegneswaran, P. L. Cole, Y. Prok, Barry Ritchie, R. C. Minehart, Kei Moriya, C. A. Meyer, G. V. Fedotov, D. P. Weygand, A. V. Skabelin, and N. Dashyan
Subjects: Physics, Nuclear and High Energy Physics, Angular range, 010308 nuclear & particles physics, Hydrogen-1, Structure function, Hyperon, Sigma, Resonance, Lambda, 01 natural sciences, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The first measurements of the polarized structure function {sigma}{sub LT{sup '}} for the reaction {sup 1}H(e-vector,e{sup '}K{sup +}){lambda} in the nucleon resonance region are reported. Measurements are included from threshold up to W=2.05 GeV for central values of Q{sup 2} of 0.65 and 1.00 GeV{sup 2}, and nearly the entire kaon center-of-mass angular range. {sigma}{sub LT{sup '}} is the imaginary part of the longitudinal-transverse response and is expected to be sensitive to interferences between competing intermediate s-channel resonances, as well as resonant and nonresonant processes. The results for {sigma}{sub LT{sup '}} are comparable in magnitude to previously reported results from CLAS for {sigma}{sub LT}, the real part of the same response. An intriguing sign change in {sigma}{sub LT{sup '}} is observed in the high Q{sup 2} data at W{approx_equal}1.9 GeV. Comparisons to several existing model predictions are shown.
Published: 2008
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25. Cross sections and beam asymmetries fore→p→enπ+in the nucleon resonance region for1.7⩽Q2⩽4.5GeV2

Author: R. Fatemi, A. V. Vlassov, T. Lee, H. G. Juengst, A. Fradi, R. De Vita, A.V. Stavinsky, N. Markov, N. Hassall, B. Zhao, D. J. Tedeschi, S. Park, Sylvain Bouchigny, K. Hafnaoui, K. Livingston, D. S. Dale, G. Rosner, R. Nasseripour, I. Bedlinskiy, S. Anefalos Pereira, P. Rossi, E. Wolin, R. Dickson, Ji Li, J. P. Ball, Y. Prok, F. W. Hersman, V. Kuznetsov, J. P. Cummings, V. Sapunenko, Dinko Pocanic, C. Hanretty, N. Guler, S. McAleer, F. X. Girod, L. Blaszczyk, D. G. Ireland, V. Crede, S. E. Kuhn, M. Osipenko, F. Sabatié, J. Lachniet, H. Denizli, A. Tkabladze, J. R. Johnstone, M. Kossov, J. R. Calarco, D. G. Crabb, D. Rowntree, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, A. I. Ostrovidov, A. C S Lima, R. Suleiman, I. Popa, G. S. Mutchler, L. Guo, G. E. Dodge, H. Y. Lu, M. Ungaro, D. Doughty, M. D. Mestayer, S. Niccolai, E. De Sanctis, Volker D. Burkert, A. S. Biselli, E. L. Isupov, C. Tur, M. Guillo, D. Heddle, W. Gohn, M. Guidal, J. Hardie, Z. Krahn, J. Kuhn, P. L. Cole, S. Barrow, Elton Smith, Friedrich Klein, M. Yurov, Kalvir S. Dhuga, Michael L. Williams, P. V. Degtyarenko, N. Baillie, M. Anghinolfi, James Mueller, A. V. Skabelin, L. Todor, D. Protopopescu, S. Mehrabyan, D. I. Sober, S. Pozdniakov, M. Garçon, J. Yun, D. Cords, S. S. Stepanyan, S. Boiarinov, P. D. Rubin, Y. G. Sharabian, A. Yegneswaran, R. A. Miskimen, Brian Raue, B. McKinnon, Atilla Gonenc, R. C. Minehart, Kei Moriya, C. A. Meyer, J. W. Price, T. Takeuchi, M. Holtrop, I. Niculescu, C. Bookwalter, G. V. Fedotov, W. Kim, G. Niculescu, G. Gavalian, Laird Kramer, G. Riccardi, D. Lawrence, Baile Zhang, Shifeng Chen, S. Dhamija, J. Shaw, P. Corvisiero, S. Tkachenko, L. El Fassi, D. Branford, Michael Wood, R. De Masi, B. E. Stokes, K. Hafidi, C. Butuceanu, D. Keller, D. Schott, G. S. Adams, N. A. Baltzell, V. Gyurjyan, N. Benmouna, M. Ripani, K. Joo, N. Dashyan, P. Mattione, D. P. Weygand, M. S. Saini, M. Mirazita, J. M. Laget, V. S. Serov, R. W. Gothe, Y. Ilieva, N. Gevorgyan, Michael Vineyard, J. Zhang, P. Nadel-Turonski, Alexei V. Klimenko, L. Cheng, Tsutomu Mibe, B. M. Preedom, L. Elouadrhiri, J. Langheinrich, K. Y. Kim, Nikolay Shvedunov, J. T. Goetz, E. Polli, H. Bagdasaryan, Lorenzo Zana, J. P. Santoro, Barry Ritchie, S. A. Philips, M. Khandaker, P. Eugenio, M. Taiuti, G. V. O'Rielly, Z. W. Zhao, I. I. Strakovsky, P. Stoler, J. D. Kellie, S. A. Morrow, V. P. Kubarovsky, V. Mokeev, R. A. Schumacher, B. Moreno, Gerard Gilfoyle, G. Ricco, C. Djalali, H. Hakobyan, H. S. Jo, Gerald Feldman, K. Hicks, O. Pogorelko, A. Deur, D. G. Jenkins, Federico Ronchetti, L. C. Dennis, L. Graham, P. Collins, B. E. Bonner, J. J. Melone, C. Salgado, D. Sokhan, K. Park, Daniel S. Carman, M. J. Amaryan, K. S. Egiyan, C. I O Gordon, N. Kalantarians, H. Avakian, W. K. Brooks, M. MacCormick, I. Hleiqawi, C. E. Hyde-Wright, D. Sharov, P. Ambrozewicz, K. Mikhailov, S. Bültmann, L. Morand, T. A. Forest, Cynthia Marie Hadjidakis, S. L. Careccia, Sergey Kuleshov, S. Stepanyan, K. L. Giovanetti, J. Pierce, Avraham Klein, Larry Weinstein, M. Bektasoglu, M. Nozar, Michael Dugger, H. O. Funsten, W. J. Briscoe, E. Pasyuk, S. A. Dytman, J. Salamanca, J. W C McNabb, L. Casey, B. B. Niczyporuk, N. Pivnyuk, V. Batourine, M. Battaglieri, L. C. Smith, E. Munevar, B. S. Ishkhanov, B. L. Berman, R. Bradford, B. A. Mecking, K. Lukashin, L. M. Qin, R. S. Hakobyan, K. A. Griffioen, C. Paterson, M. Klusman, D. P. Watts, M. R. Niroula, E. Golovatch, M. Bellis, S. Strauch, H. Egiyan, A. Cazes, Maryam Moteabbed, P. Coltharp, K. V. Dharmawardane, M. Y. Gabrielyan, R. J. Feuerbach, M. M. Ito, and Inna Aznauryan
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Resonance, 01 natural sciences, Excited state, Isospin, 0103 physical sciences, Production (computer science), Invariant mass, Sensitivity (control systems), Atomic physics, 010306 general physics, Nucleon
Abstract: The exclusive electroproduction process $\stackrel{\ensuremath{\rightarrow}}{e}p\ensuremath{\rightarrow}{e}^{'}n{\ensuremath{\pi}}^{+}$ was measured in the range of the photon virtuality ${Q}^{2}=1.7\text{\ensuremath{-}}4.5 {\mathrm{GeV}}^{2}$, and the invariant mass range for the $n{\ensuremath{\pi}}^{+}$ system of $W=1.15\text{\ensuremath{-}}1.7 \mathrm{GeV}$ using the CEBAF Large Acceptance Spectrometer. For the first time, these kinematics are probed in exclusive ${\ensuremath{\pi}}^{+}$ production from protons with nearly full coverage in the azimuthal and polar angles of the $n{\ensuremath{\pi}}^{+}$ center-of-mass system. The $n{\ensuremath{\pi}}^{+}$ channel has particular sensitivity to the isospin \textonehalf{} excited nucleon states, and together with the $p{\ensuremath{\pi}}^{0}$ final state will serve to determine the transition form factors of a large number of resonances. The largest discrepancy between these results and present modes was seen in the ${\ensuremath{\sigma}}_{{\mathit{LT}}^{'}}$ structure function. In this experiment, 31,295 cross section and 4,184 asymmetry data points were measured. Because of the large volume of data, only a reduced set of structure functions and Legendre polynomial moments can be presented that are obtained in model-independent fits to the differential cross sections.
Published: 2008
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26. π0photoproduction on the proton for photon energies from 0.675 to 2.875 GeV

Author: B. M. Preedom, J. P. Ball, D. S. Carman, L. C. Dennis, B. E. Bonner, R. A. Schumacher, H. Avakian, J. Kuhn, J. P. Santoro, Roy Thompson, B. Carnahan, D. G. Crabb, P. Eugenio, M. Taiuti, P. Collins, R. A. Niyazov, F. Sabatié, S. Bültmann, T. A. Forest, A. I. Ostrovidov, J. Langheinrich, A. C S Lima, W. J. Briscoe, V. Gyurjyan, S. S. Stepanyan, P. Stoler, J. Slamanca, S. A. Philips, S. Stepanyan, H. S. Jo, Gerald Feldman, E. Pasyuk, Valeria Muccifora, J. Pierce, Avraham Klein, D. Doughty, S. A. Dytman, D. G. Ireland, K. Wang, K. Hicks, J. Zhang, H. Bagdasaryan, D. Heddle, L. Elouadrhiri, R. J. Feuerbach, I. I. Strakovsky, Volker D. Burkert, B. B. Niczyporuk, A. S. Biselli, Gerard Gilfoyle, Marco A. Huertas, H. G. Juengst, L. Zana, G. E. Dodge, P. Coltharp, A. Deur, B. E. Stokes, W. K. Brooks, N. Pivnyuk, P. V. Degtyarenko, G. S. Adams, W. Kim, G. Gavalian, A.V. Stavinsky, J. Shaw, G. Niculescu, J. Napolitano, B. L. Berman, J. Donnelly, G. Asryan, O. P. Dzyubak, S. Tkachenko, Federico Ronchetti, Kwangsoo Kim, G. Riccardi, R. Fatemi, C. Butuceanu, Laird Kramer, M. M. Ito, L. M. Qin, F. W. Hersman, M. Kossov, A. V. Vlassov, Sylvain Bouchigny, P. Rossi, E. Anciant, G. V. O'Rielly, M. D. Mestayer, K. Joo, I. Niculescu, D. Lawrence, N. Benmouna, P. Corvisiero, M. Ripani, Carlos A. Salgado, G. Ricco, Michael L. Williams, Victor Mokeev, T. Lee, D. J. Tedeschi, M. Amarian, L. Guo, P. Nadel-Turonski, Tsutomu Mibe, Z. Krahn, Y. Ilieva, M. Spraker, M. Ungaro, Michael Wood, V. S. Serov, M. Guidal, Susan Taylor, S. Strauch, M. Khandaker, N. Baillie, C. Paterson, M. Klusman, S. Boiarinov, J. P. Cummings, R. De Vita, R. A. Miskimen, K. Park, K. S. Egiyan, B. McKinnon, D. G. Jenkins, H. Egiyan, L. C. Maximon, K. Mikhailov, A. Coleman, I. Hleiqawi, H. R. Weller, J. R. Calarco, M. Guillo, I. Bedlinskiy, S. L. Careccia, S. Simionatto, M. Holtrop, S. McAleer, Friedrich Klein, D. Branford, F. X. Girod, Brian Raue, N. Kalantarians, Hall Crannell, J. J. Manak, M. Osipenko, M. Mirazita, K. L. Giovanetti, B. Asavapibhop, Cynthia Marie Hadjidakis, J. M. Laget, A. Tkabladze, J. Yun, D. Cords, Larry Weinstein, J. W C McNabb, D. Rowntree, K. Beard, L. C. Smith, A. Yegneswaran, Michael Dugger, H. O. Funsten, Michael Vineyard, V. P. Kubarovsky, Nicola Bianchi, R. W. Gothe, B. S. Ishkhanov, Kalvir S. Dhuga, C. Marchand, V. Kuznetsov, S. A. Morrow, C. Djalali, L. Todor, A. Empl, R. S. Hakobyan, O. Pogorelko, K. Y. Kim, G. Rosner, R. Nasseripour, E. De Sanctis, D. Protopopescu, J. W. Price, M. R. Niroula, S. Pozdniakov, M. Garçon, G. Audit, C. E. Hyde-Wright, J. Lachniet, D. I. Sober, A. Shafi, P. Ambrozewicz, P. Dragovitsch, M. Bektasoglu, M. Nozar, K. Livingston, S. Niccolai, P. L. Cole, R. Dickson, J. Hardie, N. Guler, S. Barrow, M. Battaglieri, N. A. Baltzell, K. A. Griffioen, J. D. Kellie, Ron L. Workman, R. Bradford, K. Lukashin, G. S. Mutchler, M. Bellis, J. Hu, Alexei V. Klimenko, R. A. Arndt, Barry Ritchie, Bernhard Mecking, K. V. Dharmawardane, R. C. Minehart, Kei Moriya, C. A. Meyer, G. V. Fedotov, Y. Prok, D. P. Weygand, H. Denizli, A. V. Skabelin, Shifeng Chen, J. T. Goetz, V. Sapunenko, Dinko Pocanic, S. E. Kuhn, C. Tur, Elton Smith, J. R. Ficenec, M. Anghinolfi, James Mueller, P. D. Rubin, Y. G. Sharabian, and E. Wolin
Subjects: Physics, Normalization (statistics), Nuclear and High Energy Physics, Particle physics, Photon, Spectrometer, Proton, 010308 nuclear & particles physics, Forward scatter, Scattering, 01 natural sciences, Particle identification, Nuclear physics, 0103 physical sciences, Photon beam, Nuclear Experiment, 010306 general physics
Abstract: Differential cross sections for the reaction $\gamma p \to p \pi^0$ have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged photon beam with energies from 0.675 to 2.875 GeV. The results reported here possess greater accuracy in the absolute normalization than previous measurements. They disagree with recent CB-ELSA measurements for the process at forward scattering angles. Agreement with the SAID and MAID fits is found below 1 GeV. The present set of cross sections has been incorporated into the SAID database, and exploratory fits have been extended to 3 GeV. Resonance couplings have been extracted and compared to previous determinations.
Published: 2007
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27. Q2dependence of theS11(1535)photocoupling and evidence for aP-wave resonance in η electroproduction

Author: S. A. Morrow, Laird Kramer, P. Dragovitsch, P. Stoler, Barry Ritchie, J. Hardie, S. O. Nelson, K. Hicks, H. G. Juengst, M. L. Leber, Federico Ronchetti, K. Livingston, A.V. Stavinsky, D. J. Tedeschi, J. Kuhn, N. A. Baltzell, R. C. Minehart, C. A. Meyer, G. V. Fedotov, R. Dickson, L. Elouadrhiri, H. Denizli, J. P. Santoro, Roy Thompson, D. P. Weygand, I. Bedlinskiy, K. A. Griffioen, G. Ricco, N. Markov, J. Langheinrich, S. S. Stepanyan, N. Dashyan, S. A. Philips, I. I. Strakovsky, N. Guler, M. Bellis, G. A. Peterson, K. S. Egiyan, Nikolay Shvedunov, A. Deur, V. Frolov, M. J. Amaryan, K. Mikhailov, Shifeng Chen, R. J. Feuerbach, A. I. Ostrovidov, P. Eugenio, R. Fatemi, B. B. Niczyporuk, S. Barrow, W. K. Brooks, M. Taiuti, V. Batourine, I. Hleiqawi, Friedrich Klein, Y. Ilieva, C. Cetina, A. V. Vlassov, S. L. Careccia, N. Kalantarians, J. Hu, J. D. Kellie, J. P. Cummings, S. Simionatto, C. E. Hyde-Wright, Brian Raue, N. Pivnyuk, J. Napolitano, Michael Vineyard, L. Farhi, D. Rowntree, Sergey Kuleshov, N. Baillie, J. T. Goetz, E. Polli, M. Bektasoglu, M. Nozar, V. Gyurjyan, G. V. O'Rielly, P. Collins, Maryam Moteabbed, K. L. Giovanetti, B. Asavapibhop, M. Kossov, M. MacCormick, Valeria Muccifora, Bernhard Mecking, V. Sapunenko, Dinko Pocanic, R. De Vita, J. Zhang, M. Guidal, Z. W. Zhao, G. Gavalian, S. Tkachenko, R. A. Schumacher, Susan Taylor, N. Benmouna, P. L. Cole, M. Spraker, Larry Weinstein, D. Doughty, G. Rosner, L. C. Smith, S. J. Gaff, H. Bagdasaryan, R. Nasseripour, M. Holtrop, D. G. Jenkins, C. Djalali, M. D. Mestayer, E. L. Isupov, M. Ripani, L. Guo, S. Strauch, Gerard Gilfoyle, K. Sabourov, D. Heddle, Nicola Bianchi, D. P. Watts, H. Egiyan, S. Bültmann, M. Ungaro, Michael L. Williams, B. S. Ishkhanov, Sylvain Bouchigny, S. E. Kuhn, T. A. Forest, D. Sokhan, S. Stepanyan, P. Nadel-Turonski, B. E. Stokes, J. W. Price, J. Pierce, Avraham Klein, G. S. Adams, Tsutomu Mibe, G. E. Dodge, J. J. Manak, S. Boiarinov, Michael Dugger, S. McAleer, B. M. Preedom, H. Y. Lu, P. Rossi, H. O. Funsten, F. X. Girod, P. V. Degtyarenko, D. Protopopescu, R. A. Miskimen, B. McKinnon, J. H. Kelley, K. Joo, G. S. Mutchler, S. Pozdniakov, M. Garçon, L. M. Qin, J. Yun, D. Cords, C. Tur, Lorenzo Zana, D. G. Ireland, A. Shafi, A. Yegneswaran, I. Niculescu, M. Battaglieri, V. Crede, D. Lawrence, D. Branford, P. Ambrozewicz, H. Hakobyan, Kwangsoo Kim, G. Riccardi, Gerald Feldman, K. Moriya, U. Thoma, J. R. Calarco, A. Tkabladze, M. Mirazita, J. M. Laget, C. Paterson, Elton Smith, K. Wang, C. Salgado, Atilla Gonenc, M. R. Niroula, M. Klusman, R. Bradford, K. Lukashin, C. Butuceanu, M. Guillo, E. De Sanctis, M. Khandaker, M. Anghinolfi, E. Wolin, H. S. Jo, R. S. Hakobyan, James Mueller, L. El Fassi, P. D. Rubin, J. P. Ball, Y. Prok, Y. G. Sharabian, D. S. Carman, J. Lachniet, D. I. Sober, S. Niccolai, D. G. Crabb, J. Salamanca, J. W C McNabb, A. Coleman, H. R. Weller, Volker D. Burkert, A. S. Biselli, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Corvisiero, J. Miles, P. Coltharp, M. Osipenko, F. Sabatié, M. M. Ito, K. Beard, R. W. Gothe, Kalvir S. Dhuga, K. Y. Kim, W. Kim, A. V. Skabelin, G. Niculescu, B. Zhao, R. D. Levine, V. Mokeev, F. W. Hersman, L. C. Dennis, B. E. Bonner, H. Avakian, W. J. Briscoe, E. Pasyuk, S. A. Dytman, Patrick Girard, J. Shaw, Michael Wood, K. Hafidi, V. S. Serov, K. Park, V. P. Kubarovsky, A. Empl, and O. Pogorelko
Subjects: Baryon, Scattering cross-section, Physics, Nuclear and High Energy Physics, Cross section.transverse, Particle physics, Amplitude, Photon, Angular distribution, Momentum transfer, Resonance, High Energy Physics::Experiment
Abstract: New cross sections for the reaction $\mathit{ep}\ensuremath{\rightarrow}{e}^{'}\ensuremath{\eta}p$ are reported for total center-of-mass energy $W=1.5\text{\ensuremath{-}}2.3$ GeV and invariant squared momentum transfer ${Q}^{2}=0.13\text{\ensuremath{-}}3.3$ GeV${}^{2}$. This large kinematic range allows the extraction of new information about response functions, photocouplings, and $\ensuremath{\eta}N$ coupling strengths of baryon resonances. A sharp structure is seen at $W~1.7$ GeV. The shape of the differential cross section is indicative of the presence of a $P$-wave resonance that persists to high ${Q}^{2}$. Improved values are derived for the photocoupling amplitude for the ${S}_{11}$(1535) resonance. The new data greatly expand the ${Q}^{2}$ range covered, and an interpretation of all data with a consistent parametrization is provided.
Published: 2007
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28. Determination of the pion charge form factor forQ2=0.60–1.60 GeV2

Author: D. van Westrum, Ketevi Assamagan, R. van der Meer, J. Reinhold, V. Tadevosyan, C. S. Armstrong, P. H. Kim, W. Zhao, I. Niculescu, K. Vansyoc, D. Gaskell, W. Hinton, H. E. Jackson, B. Zihlmann, Andreas Klein, J. A. Dunne, D. McKee, Ronald Gilman, C. Yan, W. F. Vulcan, Rolf Ent, H. Mkrtchyan, D. Abbott, D. G. Meekins, J. Arrington, M. K. Jones, W. Kim, G. J. Lolos, H. Anklin, Oliver Keith Baker, John C. Mitchell, T. Eden, S. Stepanyan, A. F. Lung, C. Bochna, D. H. Potterveld, L. M. Qin, K. Gustafsson, G. Niculescu, I. K. Shin, C. E. Keppel, H. Breuer, S. A. Wood, D. J. Mack, Stephen Avery, N. S. Chant, B. Mueller, M. Liang, E. J. Brash, J. Volmer, G. M. Huber, D. Koltenuk, D. Pitz, H. P. Blok, and L. G. Tang
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Cross section.transverse, Pion, 010308 nuclear & particles physics, Hydrogen-1, 0103 physical sciences, Form factor (quantum field theory), Charge (physics), 010306 general physics, 01 natural sciences
Abstract: The data analysis for the reaction {sup 1}H(e,e{sup '}{pi}{sup +})n, which was used to determine values for the charged pion form factor F{sub {pi}} for values of Q{sup 2}= 0.6-1.6 GeV{sup 2}, has been repeated with careful inspection of all steps and special attention to systematic uncertainties. Also the method used to extract F{sub {pi}} from the measured longitudinal cross section was critically reconsidered. Final values for the separated longitudinal and transverse cross sections and the extracted values of F{sub {pi}} are presented.
Published: 2007
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29. Separated structure functions for the exclusive electroproduction ofK+ΛandK+Σ0final states

Author: Y. Ilieva, L. C. Dennis, B. E. Bonner, J. Kuhn, J. P. Santoro, Elton Smith, D. P. Watts, Roy Thompson, Nicola Bianchi, R. W. Gothe, H. Avakian, H. Egiyan, Latifa Elouadrhiri, R. C. Minehart, Kei Moriya, D. G. Ireland, P. Eugenio, V. Crede, M. Taiuti, P. Collins, Michael Dugger, C. A. Meyer, H. O. Funsten, K. Livingston, P. L. Cole, M. Anghinolfi, G. V. Fedotov, R. A. Miskimen, B. McKinnon, K. Y. Kim, N. Markov, A. Tkabladze, J. R. Calarco, E. Wolin, R. Dickson, I. I. Strakovsky, James Mueller, D. Rowntree, D. Branford, E. De Sanctis, A. Deur, K. S. Egiyan, W. J. Briscoe, P. D. Rubin, J. P. Ball, B. Zhao, E. Pasyuk, M. Mirazita, J. M. Laget, N. Guler, J. Lachniet, D. I. Sober, A. I. Ostrovidov, D. Doughty, W. K. Brooks, Y. G. Sharabian, D. P. Weygand, K. Mikhailov, L. El Fassi, D. G. Crabb, V. Batourine, S. A. Dytman, Volker D. Burkert, R. Fatemi, G. V. O'Rielly, D. Heddle, Daniel S. Carman, A. S. Biselli, S. Barrow, A. V. Vlassov, G. Gavalian, F. W. Hersman, P. Dragovitsch, Z. W. Zhao, L. Farhi, S. Tkachenko, V. Sapunenko, D. Sayre, N. Benmouna, M. Ripani, P. Nadel-Turonski, Dinko Pocanic, D. G. Jenkins, D. Protopopescu, Kwangsoo Kim, G. Riccardi, M. Amarian, D. Lawrence, Nikolay Shvedunov, J. P. Cummings, C. E. Hyde-Wright, A. V. Skabelin, K. Park, S. Pozdniakov, M. Garçon, C. Butuceanu, Tsutomu Mibe, P. Stoler, R. De Vita, Laird Kramer, N. Baillie, A. Shafi, S. McAleer, M. Osipenko, F. Sabatié, N. Kalantarians, S. E. Kuhn, F. X. Girod, K. Beard, M. Kossov, P. Coltharp, S. Niccolai, K. Hicks, Valeria Muccifora, B. L. Berman, Sylvain Bouchigny, C. Tur, Y. Prok, Barry Ritchie, Kalvir S. Dhuga, L. M. Qin, Gerard Gilfoyle, R. J. Feuerbach, M. M. Ito, Sergey Kuleshov, M. Guillo, M. Bektasoglu, P. Rossi, M. Nozar, V. P. Kubarovsky, J. Donnelly, G. Asryan, V. Frolov, D. Sokhan, O. P. Dzyubak, R. A. Niyazov, C. Paterson, Atilla Gonenc, J. W. Price, M. Klusman, W. Kim, J. Hardie, M. MacCormick, I. Hleiqawi, L. C. Smith, Shifeng Chen, B. S. Ishkhanov, S. L. Careccia, P. Corvisiero, S. Simionatto, G. Niculescu, K. L. Giovanetti, B. Asavapibhop, S. Taylor, Larry Weinstein, M. R. Niroula, M. Khandaker, H. G. Juengst, M. Guidal, M. Bellis, J. Salamanca, V. Mokeev, M. Holtrop, A.V. Stavinsky, C. Cetina, J. T. Goetz, Jian Zhang, E. Polli, Michael Vineyard, J. Langheinrich, S. S. Stepanyan, S. A. Philips, D. J. Tedeschi, I. Bedlinskiy, J. W C McNabb, J. Hu, M. D. Mestayer, E. L. Isupov, B. B. Niczyporuk, S. Boiarinov, Maryam Moteabbed, N. Pivnyuk, B. M. Preedom, Bernhard Mecking, Lorenzo Zana, J. Napolitano, H. Hakobyan, H. S. Jo, Gerald Feldman, K. Wang, C. Salgado, S. A. Morrow, C. Djalali, M. Battaglieri, R. Bradford, P. Ambrozewicz, K. Lukashin, N. A. Baltzell, K. A. Griffioen, J. J. Manak, J. D. Kellie, S. Strauch, G. S. Mutchler, Mathew Williams, V. Gyurjyan, H. Bagdasaryan, L. Guo, M. Ungaro, K. Joo, J. Yun, D. Cords, A. Yegneswaran, B. E. Stokes, G. Ricco, G. Rosner, R. Nasseripour, A. Empl, O. Pogorelko, Patrick Girard, Michael Wood, K. Hafidi, V. S. Serov, Friedrich Klein, Brian Raue, Federico Ronchetti, G. E. Dodge, H. Y. Lu, P. V. Degtyarenko, I. Niculescu, R. De Masi, R. A. Schumacher, S. Bültmann, T. A. Forest, S. Stepanyan, J. Pierce, Avraham Klein, and N. Dashyan
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Momentum transfer, Hyperon, Sigma, Strangeness, Lambda, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract: We report measurements of the exclusive electroproduction of K{sup +}{lambda} and K{sup +}{sigma}{sup 0} final states from a proton target using the Continuous Electron Beam Accelerator Facility (CEBAF) large-acceptance spectrometer (CLAS) detector at the Thomas Jefferson National Accelerator Facility. The separated structure functions {sigma}{sub T},{sigma}{sub L},{sigma}{sub TT}, and {sigma}{sub LT} were extracted from the {phi}- and {epsilon}-dependent differential cross sections taken with electron beam energies of 2.567, 4.056, and 4.247 GeV. This analysis represents the first {sigma}{sub L}/{sigma}{sub T} separation with the CLAS detector, and the first measurement of the kaon electroproduction structure functions away from parallel kinematics. The data span a broad range of momentum transfers from 0.5{
Published: 2007
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30. First measurement of beam-recoil observablesCxandCzin hyperon photoproduction

Author: V. Gyurjyan, L. C. Dennis, B. E. Bonner, H. Avakian, Maryam Moteabbed, Bernhard Mecking, J. Zhang, K. V. Dharmawardane, H. Bagdasaryan, K. Park, F. Sabatiã, V. P. Kubarovsky, A. Empl, O. Pogorelko, S. A. Morrow, K. Lukashin, W. J. Briscoe, E. Pasyuk, L. C. Smith, V. Sapunenko, Dinko Pocanic, S. A. Dytman, B. S. Ishkhanov, Barry Ritchie, J. Kuhn, Hall Crannell, Marco Ripani, S. E. Kuhn, E. Anciant, Roy Thompson, C. Marchand, M. Bellis, J. Shaw, M. R. Niroula, Michael Wood, J. P. Cummings, K. Hafidi, V. S. Serov, L. Elouadrhiri, C. Tur, B. P. Quinn, R. A. Schumacher, G. V. O'Rielly, R. Fatemi, B. Zhao, Kei Moriya, Federico Ronchetti, C. A. Meyer, Victor Mokeev, Z. W. Zhao, J. Hu, M. Khandaker, G. V. Fedotov, M. Kossov, L. Guo, M. Ungaro, B. L. Berman, D. G. Jenkins, Cynthia Marie Hadjidakis, S. Bültmann, T. A. Forest, A. V. Vlassov, I. Popa, I. I. Strakovsky, J. Langheinrich, S. S. Stepanyan, S. A. Philips, A. Coleman, S. Stepanyan, P. Eugenio, B. B. Niczyporuk, H. R. Weller, N. Baillie, M. Battaglieri, R. A. Miskimen, B. McKinnon, P. Dragovitsch, D. P. Weygand, M. Taiuti, J. Pierce, Avraham Klein, Shifeng Chen, Michael Dugger, Kwangsoo Kim, G. Riccardi, N. Pivnyuk, L. M. Qin, J. Napolitano, H. O. Funsten, R. Bradford, J. Yun, D. Cords, Friedrich Klein, M. Osipenko, F. W. Hersman, G. E. Dodge, S. McAleer, F. X. Girod, A. Yegneswaran, C. Butuceanu, R. J. Feuerbach, A. Deur, H. Denizli, Brian Raue, D. Branford, P. V. Degtyarenko, R. De Vita, N. Guler, P. Collins, Marco A. Huertas, M. Mirazita, J. M. Laget, P. L. Cole, M. Guidal, W. K. Brooks, K. Beard, J. Hardie, G. Niculescu, A. V. Skabelin, I. Niculescu, Giovanni Ricco, Atilla Gonenc, M. D. Mestayer, J. J. Manak, H. G. Juengst, P. Coltharp, D. Lawrence, M. Holtrop, J. W. Price, C. Paterson, R. De Masi, E. L. Isupov, P. Nadel-Turonski, M. M. Ito, C. Djalali, R. W. Gothe, Tsutomu Mibe, A.V. Stavinsky, M. Klusman, Michael L. Williams, E. De Sanctis, M. MacCormick, J. T. Goetz, J. Lachniet, D. I. Sober, G. Audit, C. E. Hyde-Wright, E. Polli, M. Guillo, J. D. Kellie, Valeria Muccifora, D. J. Tedeschi, K. Y. Kim, G. Gavalian, S. Tkachenko, V. Batourine, S. Boiarinov, B. M. Preedom, H. Y. Lu, Sergey Kuleshov, I. Bedlinskiy, M. Bektasoglu, N. Benmouna, M. Nozar, Gerard Gilfoyle, E. Wolin, B. Carnahan, Elton Smith, P. Ambrozewicz, D. Sokhan, A. Tkabladze, Nikolay Shvedunov, D. Rowntree, Lorenzo Zana, J. P. Santoro, W. Kim, J. P. Ball, Y. Prok, U. Thoma, R. S. Hakobyan, M. Anghinolfi, D. S. Carman, Sylvain Bouchigny, L. El Fassi, N. Natasha, N. Kalantarians, James Mueller, S. Niccolai, D. G. Crabb, J. Salamanca, Susan Taylor, P. Rossi, J. W C McNabb, D. P. Watts, H. Egiyan, P. D. Rubin, Y. G. Sharabian, V. Crede, J. R. Calarco, B. E. Stokes, G. S. Adams, H. S. Jo, K. Joo, N. A. Baltzell, K. A. Griffioen, N. Markov, Laird Kramer, Y. Ilieva, S. Strauch, G. S. Mutchler, A. I. Ostrovidov, A. C S Lima, D. G. Ireland, Volker D. Burkert, A. S. Biselli, Nicola Bianchi, L. Todor, D. Protopopescu, S. Pozdniakov, M. Garçon, G. Rosner, R. Nasseripour, A. Shafi, K. S. Egiyan, K. Livingston, R. Dickson, K. Mikhailov, S. Barrow, P. Stoler, K. Hicks, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, M. J. Amaryan, I. Hleiqawi, S. L. Careccia, S. Simionatto, P. Corvisiero, K. L. Giovanetti, B. Asavapibhop, M. Spraker, Larry Weinstein, D. Doughty, D. Heddle, H. Hakobyan, Gerald Feldman, K. Wang, C. Salgado, and Michael Vineyard
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, Bremsstrahlung, Hyperon, Observable, Lambda, Polarization (waves), 01 natural sciences, Induced polarization, Nuclear physics, Recoil, 0103 physical sciences, Nuclear Experiment, 010306 general physics
Abstract: Spin transfer from circularly polarized real photons to recoiling hyperons has been measured for the reactions $$\vec\gamma + p \to K^+ + \vec\Lambda$$ and $$\vec\gamma + p \to K^+ + \vec\Sigma^0$$. The data were obtained using the CLAS detector at Jefferson Lab for center-of-mass energies $W$ between 1.6 and 2.53 GeV, and for $$-0.85
Published: 2007
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31. Quark-hadron duality in spin structure functionsg1pandg1d

Author: Carlos A. Salgado, M. Amarian, Nikolay Shvedunov, S. Bültmann, M. Guidal, L. Morand, T. A. Forest, P. Dragovitsch, J. Pierce, Avraham Klein, Elton Smith, Gerard Gilfoyle, S. Niccolai, M. Holtrop, K. Livingston, G. E. Dodge, E. Wolin, Hall Crannell, Michael Vineyard, P. V. Degtyarenko, M. Anghinolfi, Hong Lu, J. Hardie, I. Niculescu, James Mueller, B. M. Preedom, D. Lawrence, P. D. Rubin, Y. G. Sharabian, P. Eugenio, R. De Masi, Lorenzo Zana, J. P. Santoro, V. Batourine, H. G. Juengst, J. Langheinrich, S. S. Stepanyan, S. A. Philips, R. Fatemi, B. Carnahan, F. Sabatié, H. S. Jo, D. Doughty, A. V. Vlassov, M. Taiuti, J. P. Ball, Y. Prok, A.V. Stavinsky, L. Elouadrhiri, N. Guler, P. Nadel-Turonski, Tsutomu Mibe, V. Gyurjyan, Federico Ronchetti, R. J. Feuerbach, V. Sapunenko, V. Crede, D. J. Tedeschi, J. P. Cummings, P. Stoler, Dinko Pocanic, D. Heddle, Daniel S. Carman, J. Zhang, B. E. Stokes, D. G. Crabb, S. E. Kuhn, C. E. Hyde-Wright, G. Ricco, J. R. Calarco, H. Denizli, G. Gavalian, N. Baillie, H. Bagdasaryan, J. W. Price, G. V. O'Rielly, I. Bedlinskiy, S. Tkachenko, M. Kossov, C. Tur, Ji Li, S. Barrow, A. Deur, K. Hicks, R. A. Miskimen, B. McKinnon, G. S. Adams, Jeffrey P. Donnelly, N. Benmouna, M. Ripani, Shifeng Chen, M. D. Mestayer, R. DeVita, Sergey Kuleshov, M. Bektasoglu, M. Nozar, E. L. Isupov, Cynthia Marie Hadjidakis, Michael L. Williams, L. M. Qin, J. W C McNabb, K. S. Egiyan, D. Branford, Friedrich Klein, Michael Dugger, P. L. Cole, S. Boiarinov, W. K. Brooks, J. Lachniet, Z. W. Zhao, A. Tkabladze, A. V. Skabelin, Brian Raue, H. O. Funsten, C. Paterson, J. T. Goetz, E. Polli, S. Stepanyan, P. Collins, M. Mirazita, S. A. Morrow, J. M. Laget, Victor Mokeev, J. J. Manak, D. Rowntree, M. Klusman, L. Todor, C. Djalali, K. Mikhailov, Marco A. Huertas, L. Guo, M. Ungaro, D. G. Jenkins, R. S. Hakobyan, Susan Taylor, E. Golovatch, Sylvain Bouchigny, D. Protopopescu, S. Pozdniakov, M. Garçon, C. D. Keith, Kwangsoo Kim, G. Riccardi, H. Egiyan, P. Rossi, P. Ambrozewicz, R. C. Minehart, C. Butuceanu, K. Joo, J. Yun, D. Cords, M. MacCormick, U. Thoma, G. Asryan, I. Hleiqawi, C. A. Meyer, A. Yegneswaran, O. P. Dzyubak, R. A. Niyazov, G. V. Fedotov, M. Bellis, S. L. Careccia, P. Corvisiero, E. De Sanctis, J. Kuhn, Roy Thompson, K. L. Giovanetti, D. I. Sober, M. Guillo, Larry Weinstein, B. B. Niczyporuk, S. McAleer, N. Pivnyuk, J. Napolitano, M. Khandaker, Y. Ilieva, F. X. Girod, D. P. Weygand, Atilla Gonenc, G. Rosner, P. Bosted, R. Nasseripour, P. Coltharp, M. M. Ito, L. C. Smith, B. S. Ishkhanov, A. Cazes, Maryam Moteabbed, Bernhard Mecking, M. R. Niroula, K. V. Dharmawardane, M. Osipenko, K. Beard, W. Kim, M. Battaglieri, G. Niculescu, R. Bradford, K. Lukashin, L. C. Dennis, Laird Kramer, B. E. Bonner, H. Avakian, E. Pasyuk, S. A. Dytman, N. Markov, K. Park, A. I. Ostrovidov, A. C S Lima, D. G. Ireland, Volker D. Burkert, A. S. Biselli, V. P. Kubarovsky, O. Pogorelko, J. Shaw, Michael Wood, K. Hafidi, V. S. Serov, S. Strauch, R. Suleiman, G. S. Mutchler, N. A. Baltzell, K. A. Griffioen, J. D. Kellie, R. W. Gothe, K. Y. Kim, B. Zhao, F. W. Hersman, and R. A. Schumacher
Subjects: Physics, Quantum chromodynamics, Quark, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Hadron, Duality (optimization), 01 natural sciences, Resonance (particle physics), Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Spin-½
Abstract: New measurements of the spin structure functions of the proton and deuteron g1p(x,Q2) and g1d(x,Q2) in the nucleon resonance region are compared with extrapolations of target-mass-corrected next-to-leading-order (NLO) QCD fits to higher energy data. Averaged over the entire resonance region (W 1.7 GeV2. This global duality appears to result from cancellations among the prominent local resonance regions: in particular strong sigma{3/2} contributions in the Delta(1232) region appear to be compensated by strong sigma{1/2} contributions in the resonance region centered on 1.5 GeV. These results are encouraging for the extension of NLO QCD fits to lower W and Q2 than have been used previously.
Published: 2007
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32. Separated response functions in exclusive, forward pi(+/-) electroproduction on deuterium

Author: L. Pentchev, L. G. Tang, S. Jin, D. van Westrum, D. G. Meekins, C. C. Chang, John C. Mitchell, C. Yan, H. C. Fenker, E. J. Beise, P. E. Reimer, G. M. Huber, John Arrington, W. U. Boeglin, P. M. King, G. R. Smith, D. Koltenuk, X. Zheng, D. J. Margaziotis, V. Kovaltchouk, H. P. Blok, B. Mueller, S. A. Wood, T. Eden, W. Hinton, M. Liang, Ketevi Assamagan, D. McKee, Joerg Reinhold, A. J. Sarty, V. Tvaskis, S. Vidakovic, V. Tadevosyan, R. J. Holt, W. F. Vulcan, D. J. Mack, L. M. Qin, C. S. Armstrong, Stephen Avery, Ronald Gilman, I. K. Shin, D. Abbott, K. A. Aniol, B. Zihlmann, C. E. Keppel, P. H. Kim, W. Zhao, J. Volmer, Y. Okayasu, D. H. Potterveld, H. E. Jackson, M. K. Jones, E. J. Brash, G. J. Lolos, J. Roche, H. Breuer, Tanja Horn, R. L.J. van der Meer, K. Vansyoc, C. Butuceanu, H. Anklin, C. Xu, D. Gaskell, N. S. Chant, D. Pitz, C. Bochna, I. Niculescu, Glen A. Warren, K. Gustafsson, E. F. Gibson, S. Stepanyan, H. Mkrtchyan, P. G. Roos, Avraham Klein, A. Matsumura, O. K. Baker, A. Lung, T. Miyoshi, C. F. Perdrisat, Rolf Ent, Jin Liu, M. E. Christy, W. Kim, G. Niculescu, Pete Markowitz, J. A. Dunne, B. Barrett, V. A. Punjabi, and Student Lab and Education
Subjects: Quantum chromodynamics, Quark, Physics, Nuclear and High Energy Physics, Particle physics, SDG 16 - Peace, Meson, Isoscalar, SDG 16 - Peace, Justice and Strong Institutions, Form factor (quantum field theory), Virtual particle, Parton, Justice and Strong Institutions, Nuclear physics, Pion, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, $Q^2$, and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in $\pi^-$ and $\pi^+$ electroproduction are particularly informative. The ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from electroproduction data. Method: Data were acquired with 2.6-5.2 GeV electron beams and the HMS+SOS spectrometers in Jefferson Lab Hall C, at central $Q^2$ values of 0.6, 1.0, 1.6 GeV$^2$ at W=1.95 GeV, and $Q^2$=2.45 GeV$^2$ at W=2.22 GeV. There was significant coverage in $\phi$ and $\epsilon$, which allowed separation of $\sigma_{L,T,LT,TT}$. Results: $\sigma_L$ shows a clear signature of the pion pole, with a sharp rise at small -t. In contrast, $\sigma_T$ is much flatter versus t. The longitudinal/transverse ratios evolve with $Q^2$ and t, and at the highest $Q^2$=2.45 GeV$^2$ show a slight enhancement for $\pi^-$ production compared to $\pi^+$. The $\pi^-/\pi^+$ ratio for transverse photons exhibits only a small $Q^2$-dependence, following a nearly universal curve with t, with a steep transition to a value of about 0.25, consistent with s-channel quark knockout. The $\sigma_{TT}/\sigma_T$ ratio also drops rapidly with $Q^2$, qualitatively consistent with s-channel helicity conservation. The $\pi^-/\pi^+$ ratio for longitudinal photons indicates a small isoscalar contamination at W=1.95 GeV, consistent with what was observed in our earlier determination of the pion form factor at these kinematics., Comment: 25 pages, 16 figures, 6 tables
Published: 2015
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33. Measurement of theN→Δ+(1232)Transition at High-Momentum Transfer byπ0Electroproduction

Author: L. C. Smith, B. Zhao, B. S. Ishkhanov, G. E. Dodge, P. V. Degtyarenko, V. Gyurjyan, I. Niculescu, D. Lawrence, M. Battaglieri, M. R. Niroula, J. Zhang, R. Fatemi, H. Bagdasaryan, A. V. Vlassov, L. Todor, T. Lee, F. W. Hersman, C. Marchand, V. Sapunenko, D. Protopopescu, R. A. Schumacher, I. Bedliski, Dinko Pocanic, B. M. Preedom, Inna Aznauryan, S. Pozdniakov, M. Garçon, Michael Wood, C. I O Gordon, S. Bültmann, L. Morand, Avraham Klein, R. Bradford, M. Khandaker, V. S. Serov, J. Lachniet, A. Tkabladze, B. L. Berman, Lorenzo Zana, J. P. Santoro, B. E. Stokes, Alexei V. Klimenko, E. Wolin, J. P. Cummings, S. Strauch, H. Egiyan, S. E. Kuhn, L. M. Qin, J. R. Calarco, G. S. Adams, M. Guidal, K. Park, H. S. Jo, Gerald Feldman, Y. Ilieva, R. A. Miskimen, B. McKinnon, V. P. Kubarovsky, Barry Ritchie, C. Salgado, M. Kossov, G. V. O'Rielly, S. A. Morrow, J. Kuhn, O. Pogorelko, C. Djalali, C. Tur, Baile Zhang, D. Doughty, L. C. Dennis, W. Kim, Rakhsha Nasseripour, N. Markov, B. E. Bonner, D. Branford, J. P. Ball, Y. Prok, H. Avakian, M. Holtrop, G. Niculescu, M. Bellis, Shifeng Chen, Ji Li, M. Mirazita, Latifa Elouadrhiri, J. M. Laget, R. C. Minehart, R. S. Hakobyan, N. A. Baltzell, C. A. Meyer, M. Guillo, E. De Sanctis, V. Batourine, K. Livingston, D. G. Jenkins, M. D. Mestayer, G. V. Fedotov, D. I. Sober, Sylvain Bouchigny, F. Sabatié, P. Ambrozewicz, S. Stepanyan, Michael L. Williams, K. A. Griffioen, Laird Kramer, P. Rossi, D. G. Crabb, N. Guler, S. Boiarinov, W. J. Briscoe, J. T. Goetz, E. Polli, Elton Smith, P. Eugenio, M. Taiuti, E. Pasyuk, D. P. Weygand, P. L. Cole, S. Barrow, S. McAleer, J. Langheinrich, S. S. Stepanyan, M. Anghinolfi, S. A. Philips, James Mueller, H. Denizli, F. X. Girod, U. Thoma, S. A. Dytman, J. D. Kellie, P. D. Rubin, P. Coltharp, Y. G. Sharabian, S. Mehrabyan, A. Cazes, Bernhard Mecking, D. Heddle, A. I. Ostrovidov, K. V. Dharmawardane, I. I. Strakovsky, I. Hleiqawi, G. Rosner, M. M. Ito, J. J. Melone, G. Riccardi, A. Deur, A. V. Skabelin, D. G. Ireland, R. DeVita, J. W C McNabb, S. L. Careccia, Michael Vineyard, Volker D. Burkert, W. K. Brooks, C. Butuceanu, J. W. Price, G. S. Mutchler, B. B. Niczyporuk, K. L. Giovanetti, M. Osipenko, N. Pivnyuk, J. Napolitano, Larry Weinstein, Gerard Gilfoyle, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Bektasoglu, M. Nozar, Victor Mokeev, A. S. Biselli, R. W. Gothe, G. Ricco, M. Amarian, P. Stoler, Friedrich Klein, K. Hicks, Brian Raue, K. S. Egiyan, Cynthia Marie Hadjidakis, Michael Dugger, H. O. Funsten, K. Mikhailov, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, Federico Ronchetti, P. Corvisiero, G. Gavalian, S. Tkachenko, N. Benmouna, M. Ripani, H. G. Juengst, A.V. Stavinsky, D. J. Tedeschi, S. Niccolai, J. Hardie, L. Guo, M. Ungaro, K. Joo, D. Cords, A. Yegneswaran, and R. J. Feuerbach
Subjects: Physics, Proton, 010308 nuclear & particles physics, Momentum transfer, Scalar (mathematics), Solid angle, General Physics and Astronomy, Resonance, 01 natural sciences, Helicity, Nuclear physics, Amplitude, 0103 physical sciences, Magnetic form factor, 010306 general physics
Abstract: We report a new measurement of the exclusive electroproduction reaction gamma*_p --> pi0_p to explore the evolution from soft nonperturbative physics to hard processes via the Q2 dependence of the magnetic (M1+), electric (E1+), and scalar (S1+) multipoles in the N --> Delta transition. 9000 differential cross section data points cover W from threshold to 1.4 GeV/c2, 4pi center-of-mass solid angle, and Q2 from 3 to 6 GeV2/c2, the highest yet achieved. It is found that the magnetic form factor G^*M decreases with Q2 more steeply than the proton magnetic form factor, the ratio E1+/M1+ is small and negative, indicating strong helicity nonconservation, and the ratio S1+/M1+ is negative, while its magnitude increases with Q2.
Published: 2006
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34. Erratum:η′Photoproduction on the Proton for Photon Energies from 1.527 to 2.227 GeV [Phys. Rev. Lett.96, 062001 (2006)]

Author: Laird Kramer, Dinko Pocanic, G. S. Mutchler, S. E. Kuhn, G. Rosner, Stephen Taylor, Yordanka Ilieva, M. D. Mestayer, J. J. Manak, P. Eugenio, M. Osipenko, Shifeng Chen, M. Taiuti, S. Boiarinov, B. M. Preedom, M. Guidal, G. Niculescu, K. Beard, K. Livingston, K. S. Egiyan, M. Holtrop, R. A. Schumacher, Lorenzo Zana, Frank Klein, K. Mikhailov, M. Guillo, J. T. Goetz, J. Langheinrich, S. A. Philips, K. A. Griffioen, V. Batourine, D. G. Ireland, V. Crede, S. A. Morrow, P. Rubin, L. Elouadrhiri, A.V. Stavinsky, H. S. Jo, Gerald Feldman, J. R. Calarco, N. Guler, G. Gavalian, C. Djalali, G. Audit, C. E. Hyde-Wright, R. J. Feuerbach, M. Bektasoglu, J. Shaw, N. A. Baltzell, I. I. Strakovsky, B. Carnahan, F. Sabatié, K. Wang, B. E. Stokes, G. S. Adams, D. J. Tedeschi, V. Mokeev, J. P. Cummings, J. Hu, E. Wolin, P. Ambrozewicz, Michael Wood, A. Deur, J. Donnelly, G. Asryan, S. Barrow, O. P. Dzyubak, R. A. Niyazov, H. Juengst, V. S. Serov, R. A. Miskimen, B. McKinnon, I. Bedlinskiy, M. Anghinolfi, G. V. O'Rielly, J. P. Ball, Y. Prok, M. Kossov, Andreas Klein, K. V. Dharmawardane, M. Nozar, P. Corvisiero, James Mueller, Rakhsha Nasseripour, K. S. Dhuga, D. Branford, J. P. Santoro, M. Bellis, E. S. Smith, Marco A. Huertas, D. S. Carman, A. Coleman, H. R. Weller, Roy Thompson, D. Protopopescu, T. A. Forest, D. G. Jenkins, J. D. Kellie, Y. G. Sharabian, Cynthia Marie Hadjidakis, E. De Sanctis, M. Mirazita, J. M. Laget, M. Battaglieri, P. Collins, M. Spraker, V. Gyurjyan, A. I. Ostrovidov, P. Stoler, A. C S Lima, K. Park, L. C. Smith, S. Pozdniakov, M. Garçon, B. S. Ishkhanov, P. L. Cole, Michael Vineyard, A. Shafi, Mark Richard James Williams, S. Stepanyan, Sylvain Bouchigny, R. Bradford, B. A. Mecking, P. Rossi, R. DeVita, J. Zhang, V. P. Kubarovsky, D. G. Crabb, Michael Dugger, Volker D. Burkert, H. Egiyan, J. Pierce, J. W C McNabb, K. Hicks, W. Kim, Clarisse Tur, P. Nadel-Turonski, H. Bagdasaryan, J. W. Price, V. Sapunenko, Valeria Muccifora, A. Empl, O. Pogorelko, A. S. Biselli, P. Dragovitsch, D. I. Sober, S. McAleer, F. X. Girod, Tsutomu Mibe, B. L. Berman, H. O. Funsten, S. Niccolai, L. M. Qin, Gerard Gilfoyle, B. B. Niczyporuk, William Brooks, U. Thoma, L. C. Dennis, B. E. Bonner, P. Coltharp, N. Pivnyuk, K. Lukashin, J. Napolitano, Hall Crannell, H. Avakian, M. M. Ito, J. Hardie, S. Strauch, Jens H. Kuhn, C. Paterson, Nicola Bianchi, L. C. Maximon, C. Marchand, M. Klusman, J. Lachniet, A. Tkabladze, L. Guo, M. Ungaro, G. E. Dodge, D. Rowntree, P. V. Degtyarenko, K. Kim, S. Bültmann, W. J. Briscoe, E. Pasyuk, K. Joo, J. Yun, D. Cords, S. S. Stepanyan, N. Baillie, S. A. Dytman, R. S. Hakobyan, R. Fatemi, A. Yegneswaran, D. Lawrence, A. V. Vlassov, Kwangsoo Kim, G. Riccardi, C. Butuceanu, S. Tkachenko, N. Benmouna, T. Lee, M. Ripani, Carlos A. Salgado, G. Ricco, Brian Raue, Federico Ronchetti, R. C. Minehart, C. A. Meyer, G. V. Fedotov, D. P. Weygand, D. Doughty, H. Denizli, D. Heddle, A. V. Skabelin, Alexei V. Klimenko, Barry Ritchie, E. Anciant, M. Khandaker, I. Hleiqawi, S. L. Careccia, S. Simionatto, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, F. W. Hersman, and R. W. Gothe
Subjects: Physics, Nuclear physics, Meson production, Photon, Proton, General Physics and Astronomy
Published: 2006
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35. Measurement of the deuteron structure functionF2in the resonance region and evaluation of its moments

Author: B. E. Stokes, G. S. Adams, Daniel S. Carman, J. P. Cummings, K. Joo, M. Guillo, G. Audit, C. E. Hyde-Wright, B. M. Preedom, M. Kossov, Susan Taylor, S. Strauch, C. Marchand, H. Egiyan, Silvano Simula, Lorenzo Zana, J. P. Santoro, P. Eugenio, K. Park, M. Taiuti, H. S. Jo, M. Nozar, G. V. O'Rielly, I. Hleiqawi, Alexei V. Klimenko, K. S. Egiyan, S. L. Careccia, J. R. Calarco, W. Kim, Y. Ilieva, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, M. Khandaker, K. Mikhailov, V. P. Kubarovsky, C. Salgado, Barry Ritchie, M. Battaglieri, D. Doughty, G. Niculescu, R. DeVita, J. W C McNabb, D. Heddle, R. J. Feuerbach, R. A. Schumacher, D. G. Jenkins, A. Empl, N. A. Baltzell, L. C. Smith, B. S. Ishkhanov, E. Wolin, O. Pogorelko, Shifeng Chen, H. G. Juengst, R. Bradford, K. Lukashin, J. J. Melone, E. Golovatch, S. McAleer, K. A. Griffioen, S. A. Morrow, M. Guidal, H. Denizli, C. Djalali, F. X. Girod, J. P. Ball, Y. Prok, A.V. Stavinsky, Ji Li, L. M. Qin, A. V. Skabelin, Marco A. Huertas, Federico Ronchetti, J. Donnelly, G. Rosner, R. Nasseripour, J. D. Kellie, D. G. Crabb, J. T. Goetz, E. Polli, U. Thoma, C. I O Gordon, M. Holtrop, G. Asryan, L. Todor, D. J. Tedeschi, D. Protopopescu, M. D. Mestayer, G. Gavalian, R. C. Minehart, P. Ambrozewicz, L. Elouadrhiri, S. Pozdniakov, M. Garçon, O. P. Dzyubak, A. Cazes, V. Sapunenko, Dinko Pocanic, Sylvain Bouchigny, C. A. Meyer, N. Benmouna, M. Ripani, J. Shaw, G. V. Fedotov, Michael L. Williams, Bernhard Mecking, J. Kuhn, K. V. Dharmawardane, J. W. Price, M. Osipenko, I. Bedlinskiy, M. Klusman, P. Rossi, P. Corvisiero, S. E. Kuhn, S. Boiarinov, S. Bültmann, A. Tkabladze, Michael Wood, D. P. Weygand, A. Deur, Roy Thompson, K. Beard, R. Suleiman, G. Ricco, C. Tur, L. Morand, T. A. Forest, P. Coltharp, V. S. Serov, L. C. Dennis, B. E. Bonner, W. K. Brooks, Cynthia Marie Hadjidakis, G. S. Mutchler, S. Stepanyan, H. Avakian, Michael Dugger, H. O. Funsten, K. Livingston, M. M. Ito, Michael Vineyard, P. Stoler, J. Pierce, Avraham Klein, J. Langheinrich, S. S. Stepanyan, S. A. Philips, B. B. Niczyporuk, Elton Smith, M. Anghinolfi, N. Pivnyuk, J. Napolitano, V. Batourine, S. Mehrabyan, James Mueller, F. Sabatié, P. D. Rubin, E. Pasyuk, P. Dragovitsch, N. Guler, G. Nefedov, K. Hicks, S. A. Dytman, M. Bellis, S. Niccolai, Y. G. Sharabian, G. E. Dodge, J. Hardie, Friedrich Klein, S. Barrow, Brian Raue, P. V. Degtyarenko, Kwangsoo Kim, G. Riccardi, J. Hu, A. Coleman, F. W. Hersman, I. Niculescu, D. Lawrence, C. Butuceanu, Gerard Gilfoyle, R. W. Gothe, R. A. Miskimen, K. Y. Kim, B. McKinnon, D. Branford, M. Mirazita, J. M. Laget, Laird Kramer, N. Baillie, E. De Sanctis, D. I. Sober, R. Fatemi, A. V. Vlassov, T. Lee, J. J. Manak, A. I. Ostrovidov, A. C S Lima, D. G. Ireland, Volker D. Burkert, A. S. Biselli, M. Bektasoglu, J. Lachniet, D. Rowntree, R. S. Hakobyan, P. Nadel-Turonski, P. L. Cole, L. Guo, M. Ungaro, R. A. Niyazov, J. Yun, D. Cords, A. Yegneswaran, V. Gyurjyan, J. Zhang, H. Bagdasaryan, and Victor Mokeev
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Scattering, Hadron, Resonance, 01 natural sciences, Nuclear physics, Cover (topology), 0103 physical sciences, Invariant mass, Operator product expansion, Twist, 010306 general physics
Abstract: Inclusive electron scattering off the deuteron has been measured to extract the deuteron structure function F{sub 2} with the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. The measurement covers the entire resonance region from the quasielastic peak up to the invariant mass of the final-state hadronic system W{approx_equal}2.7 GeV with four-momentum transfers Q{sup 2} from 0.4 to 6 (GeV/c){sup 2}. These data are complementary to previous measurements of the proton structure function F{sub 2} and cover a similar two-dimensional region of Q{sup 2} and Bjorken variable x. Determination of the deuteron F{sub 2} over a large x interval including the quasielastic peak as a function of Q{sup 2}, together with the other world data, permit a direct evaluation of the structure function moments for the first time. By fitting the Q{sup 2} evolution of these moments with an OPE-based twist expansion we have obtained a separation of the leading twist and higher twist terms. The observed Q{sup 2} behavior of the higher twist contribution suggests a partial cancelation of different higher twists entering into the expansion with opposite signs. This cancelation, found also in the proton moments, is a manifestation of the 'duality' phenomenon inmore » the F{sub 2} structure function.« less
Published: 2006
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36. Differential cross sections forγ+p→K++Yfor Λ andΣ0hyperons

Author: R. Bradford, R. A. Schumacher, J. W. C. McNabb, L. Todor, G. Adams, P. Ambrozewicz, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Asryan, G. Audit, H. Avakian, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, S. Barrow, V. Batourine, M. Battaglieri, K. Beard, I. Bedlinskiy, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, N. Bianchi, A. S. Biselli, B. E. Bonner, S. Bouchigny, S. Boiarinov, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, B. Carnahan, S. Chen, P. L. Cole, A. Coleman, P. Coltharp, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, R. DeVita, E. De Sanctis, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deur, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, J. Donnelly, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, P. Eugenio, R. Fatemi, G. Fedotov, G. Feldman, R. J. Feuerbach, T. A. Forest, H. Funsten, M. Garçon, G. Gavalian, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, E. Golovatch, A. Gonenc, R. W. Gothe, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, J. Hu, M. Huertas, C. E. Hyde-Wright, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, M. M. Ito, D. Jenkins, H. S. Jo, K. Joo, H. G. Juengst, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, S. V. Kuleshov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, A. C. S. Lima, K. Livingston, K. Lukashin, J. J. Manak, C. Marchand, S. McAleer, B. McKinnon, B. A. Mecking, M. D. Mestayer, C. A. Meyer, T. Mibe, K. Mikhailov, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, S. A. Morrow, V. Muccifora, J. Mueller, G. S. Mutchler, P. Nadel-Turonski, J. Napolitano, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, G. V. O'Rielly, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. A. Philips, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, I. Popa, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. P. Quinn, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, C. Salgado, J. P. Santoro, V. Sapunenko, V. S. Serov, A. Shafi, Y. G. Sharabian, J. Shaw, S. Simionatto, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, M. Spraker, A. Stavinsky, S. S. Stepanyan, S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, R. Suleiman, M. Taiuti, S. Taylor, D. J. Tedeschi, U. Thoma, R. Thompson, A. Tkabladze, S. Tkachenko, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, H. Weller, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, L. Zana, J. Zhang, and B. Zhao
Subjects: Physics, Nuclear and High Energy Physics, Angular distribution, Effective lagrangian, Hyperon, Theoretical models, Sigma, Atomic physics, Lambda, Scaling, Resonance (particle physics)
Abstract: High-statistics cross sections for the reactions {gamma} + p {yields} K{sup +} + {Lambda} and {gamma} + p {yields} K{sup +} + {Sigma}{sup 0} have been measured using CLAS at Jefferson Lab for center-of-mass energies W between 1.6 and 2.53 GeV, and for -0.85 < cos {theta}{sub K{sup +}}{sup c.m.} < +0.95. In the K{sup +}{Lambda} channel we confirm a resonance-like structure near W=1.9 GeV at backward kaon angles. The position and width of this structure change with angle, indicating that more than one resonance is likely playing a role. The K{sup +} {Lambda} channel at forward angles and all energies is well described by a t-channel scaling characteristic of Regge exchange, while the same scaling applied to the K{sup +} {Sigma}{sup 0} channel is less successful. Several existing theoretical models are compared to the data, but none provide a good representation of the results.
Published: 2006
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37. Measurement of Two- and Three-Nucleon Short-Range Correlation Probabilities in Nuclei

Author: D. Doughty, J. Langheinrich, E. Pasyuk, P. Nadel-Turonski, L. M. Qin, Tsutomu Mibe, K. Mikhailov, Y. Prok, H. Denizli, M. Klusman, N. A. Baltzell, V. Batourine, B. Carnahan, K. A. Griffioen, K. S. Egiyan, P. Coltharp, G. Ricco, Victor Mokeev, R. A. Schumacher, C. Bultuceanu, Cynthia Marie Hadjidakis, Michael Dugger, K. Park, Daniel S. Carman, H. O. Funsten, Friedrich Klein, S. Tkachenko, L. Guo, M. Ungaro, M. Osipenko, F. Sabatié, S. Bültmann, T. A. Forest, Bernhard Mecking, V. P. Kubarovsky, K. V. Dharmawardane, C. E. Hyde-Wright, J. Donnelly, G. Asryan, O. P. Dzyubak, M. M. Ito, P. Eugenio, M. Taiuti, S. Stepanyan, J. D. Kellie, B. E. Stokes, C. Peterson, G. S. Adams, Alexei V. Klimenko, R. Miskimen, Sergey Kuleshov, M. Bektasoglu, J. Pierce, R. J. Feuerbach, A. Empl, O. Pogorelko, Avraham Klein, L. C. Dennis, P. Corvisiero, K. Joo, L. C. Smith, Elton Smith, B. E. Bonner, R. A. Niyazov, J. Yun, M. Battaglieri, D. J. Tedeschi, H. Avakian, M. Guidal, Barry Ritchie, J. R. Calarco, B. S. Ishkhanov, N. Guler, E. De Sanctis, Federico Ronchetti, David Jenkins, A. Yegneswaran, R. Bradford, G. Gavalian, R. DeVita, J. W C McNabb, Hall Crannell, F. W. Hersman, P. Stoler, M. Anghinolfi, M. Holtrop, W. Kim, James Mueller, N. Benmouna, M. Ripani, Latifa Elouadrhiri, S. Strauch, P. L. Cole, J. Lachniet, E. Golovatch, D. I. Sober, R. C. Minehart, C. A. Meyer, Michael Vineyard, P. D. Rubin, G. E. Dodge, A. Tkabladze, Y. G. Sharabian, G. V. Fedotov, G. Rosner, B. B. Niczyporuk, Misak Sargsian, M. Bellis, P. Dragovitsch, D. Rowntree, Mark Strikman, P. V. Degtyarenko, R. Fatemi, J. Zhang, R. Suleiman, S. Taylor, G. Niculescu, S. A. Dytman, N. Pivnyuk, V. Sapunenko, Dinko Pocanic, A. V. Vlassov, J. Hu, D. P. Weygand, J. Kuhn, T. Lee, G. S. Mutchler, I. Niculescu, S. Niccolai, L. C. Maximon, M. Khandaker, Roy Thompson, S. E. Kuhn, D. Lawrence, S. A. Morrow, C. Djalali, M. Guillo, C. Tur, J. Hardie, J. Shaw, Shifeng Chen, R. W. Gothe, P. Ambrozewicz, M. D. Mestayer, H. Egiyan, W. K. Brooks, K. Y. Kim, A.V. Stavinsky, J. T. Goetz, E. Polli, V. Gyurjyan, Marco A. Huertas, Michael Wood, V. S. Serov, Michael L. Williams, Sylvain Bouchigny, I. Bedlinskiy, S. Boiarinov, B. M. Preedom, Lorenzo Zana, J. P. Santoro, H. S. Jo, C. Salgado, A. I. Ostrovidov, D. G. Ireland, Gerard Gilfoyle, Volker D. Burkert, A. S. Biselli, B. McKinnon, H. G. Juengst, K.H. Hicks, D. Branford, M. Mirazita, J. M. Laget, N. Gevorgyan, Laird Kramer, N. Baillie, E. Wolin, J. P. Ball, D. G. Crabb, Kwangsoo Kim, Jim Napolitano, G. Riccardi, B. A. Raue, N. Dashyan, I. Hleiqawi, S. L. Careccia, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, S. McAleer, F. X. Girod, Y. Ilieva, Hovhannes Baghdasaryan, J. W. Price, J. P. Cummings, Rakhsha Nasseripour, L. Todor, D. Protopopescu, S. Pozdniakov, G. V. O'Rielly, K. Livingston, and P. Rossi
Subjects: Physics, Nuclear physics, Helium-4, Scattering, Helium-3, Carbon-12, General Physics and Astronomy, Nuclear force, Electron, Atomic physics, Nucleon, Electron scattering
Abstract: The ratios of inclusive electron scattering cross sections of {sup 4}He, {sup 12}C, and {sup 56}Fe to {sup 3}He have been measured at 1 1.4 GeV{sup 2}, the ratios exhibit two separate plateaus, at 1.5 2.25. This pattern is predicted by models that include 2- and 3-nucleon short-range correlations (SRC). Relative to A=3, the per-nucleon probabilities of 3-nucleon SRC are 2.3, 3.1, and 4.4 times larger for A=4, 12, and 56. This is the first measurement of 3-nucleon SRC probabilities in nuclei.
Published: 2006
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38. Singleπ+electroproduction on the proton in the first and second resonance regions at0.25GeV2<Q2<0.65GeV2

Author: J. Kuhn, Shifeng Chen, R. J. Feuerbach, Roy Thompson, R. W. Gothe, K. Y. Kim, C. Cetina, Y. Kuang, V. Gyurjyan, J. Zhang, E. Anciant, Michael Vineyard, M. Guidal, G. E. Dodge, H. Bagdasaryan, E. Polli, F. W. Hersman, G. Gavalian, K. S. Egiyan, G. Niculescu, Daijin Kim, Min Suk Kim, S. Stepanyan, P. V. Degtyarenko, L. M. Qin, Sylvain Bouchigny, N. Benmouna, M. Ripani, M. Khandaker, K. A. Griffioen, G. Ricco, K. Mikhailov, P. Rossi, M. Holtrop, H. Denizli, Elton Smith, P. Eugenio, M. Taiuti, Philip L. Cole, Ji Li, F. Ronchetti, K. Livingston, E. DeSanctis, G. V. O'Rielly, M. Klusman, M. Anghinolfi, James Mueller, I. Niculescu, Moshe Gai, A. V. Skabelin, E. Wolin, I. G. Aznauryan, I. Hleiqawi, P. D. Rubin, Y. G. Sharabian, J. P. Cummings, D. G. Jenkins, Friedrich Klein, Victor Mokeev, D. Lawrence, S. L. Careccia, S. Simionatto, M. D. Mestayer, Alexei V. Klimenko, K. Sabourov, M. Osipenko, J. Langheinrich, R. DeVita, J. D. Kellie, J. W C McNabb, R. S. Hicks, Brian Raue, J. Lachniet, P. Stoler, J. R. Calarco, L. C. Smith, S. J. Gaff, B. S. Ishkhanov, S. A. Philips, Barry Ritchie, K. Beard, P. Dragovitsch, Dinko Pocanic, M. Kossov, G. T. Goetz, D. Rowntree, Rakhsha Nasseripour, S. McAleer, S. O. Nelson, K. L. Giovanetti, B. Asavapibhop, M. Spraker, Larry Weinstein, L. Guo, M. Ungaro, J. J. Melone, Bernhard Mecking, K. Hicks, S. E. Kuhn, B. Carnahan, F. Sabatié, Latifa Elouadrhiri, W. Kim, K. V. Dharmawardane, D. Doughty, D. Heddle, J. P. Ball, Y. Prok, R. C. Minehart, Cynthia Marie Hadjidakis, C. A. Meyer, B. B. Niczyporuk, J. H. Kelley, S. Niccolai, G. V. Fedotov, C. Tur, Shalev Gilad, Thierry Auger, Michael Dugger, N. Guler, S. Boiarinov, B. M. Preedom, A. Tkabladze, R. S. Hakobyan, O. P. Dzyubak, Daniel S. Carman, Susan Taylor, S. Strauch, G. A. Peterson, H. O. Funsten, M. Eckhause, D. P. Weygand, J. W. Price, J. Hardie, N. Pivnyuk, J. Napolitano, A. Longhi, G. Audit, K. Joo, C. E. Hyde-Wright, R. A. Niyazov, J. Yun, D. Cords, H. Egiyan, A. Yegneswaran, J. P. Santoro, P. Corvisiero, M. Sargsyan, A.V. Stavinsky, N. Baltzel, Hall Crannell, S. A. Morrow, S. Barrow, L. C. Dennis, B. E. Bonner, C. S. Whisnant, C. Djalali, D. J. Tedeschi, C. Marchand, Gerald Feldman, R. A. Schumacher, H. Avakian, J. Hu, M. Nozar, A. Coleman, L. Todor, M. Battaglieri, H. R. Weller, P. Ambrozewicz, K. Wang, C. Salgado, D. Protopopescu, S. Pozdniakov, C. I O Gordon, R. Bradford, K. Lukashin, D. G. Crabb, G. S. Mutchler, Z. L. Zhou, G. Rosner, J. Donnely, A. Shafi, L. Morand, T. A. Forest, W. J. Briscoe, E. Pasyuk, Avraham Klein, S. A. Dytman, G. S. Adams, Y. Ilieva, M. Bellis, K. Park, M. M. Ito, R. Fatemi, A. V. Vlassov, V. P. Kubarovsky, A. Empl, O. Pogorelko, J. J. Manak, Patrick Girard, J. Shaw, Michael Wood, V. S. Serov, Nicola Bianchi, D. I. Sober, L. Y. Murphy, S. Mehrabyan, Kwangsoo Kim, G. Riccardi, C. Butuceanu, Laird Kramer, M. Bektasoglu, D. G. Ireland, Volker D. Burkert, Jing Zhao, A. S. Biselli, R. A. Miskimen, B. McKinnon, H. G. Juengst, D. Branford, M. Mirazita, J. M. Laget, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, U. Thoma, M. Guillo, I. I. Strakovsky, and W. K. Brooks
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Hadron, Resonance, Sigma, 01 natural sciences, 7. Clean energy, Helicity, Particle identification, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The ep {yields} e'pi{sup +}n reaction was studied in the first and second nucleon resonance regions in the 0.25 GeV{sup 2} < Q{sup 2} < 0.65 GeV{sup 2} range using the CLAS detector at Thomas Jefferson National Accelerator Facility. For the first time the absolute cross sections were measured covering nearly the full angular range in the hadronic center-of-mass frame. The structure functions {sigma}{sub TL}, {sigma}{sub TT} and the linear combination {sigma}{sub T} + {epsilon}{sigma}{sub L} were extracted by fitting the {phi}-dependence of the measured cross sections, and were compared to the MAID and Sato-Lee models.
Published: 2006
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39. $\eta$' Photoproduction on the Proton for Photon Energies from 1.527 to 2.227 GeV

Author: K. S. Egiyan, I. Hleiqawi, L. C. Smith, B. S. Ishkhanov, R. Fatemi, L. C. Dennis, B. E. Bonner, S. L. Careccia, S. Simionatto, A. V. Vlassov, K. Mikhailov, H. Avakian, V. Mokeev, T. Lee, V. Sapunenko, K. L. Giovanetti, B. Asavapibhop, Bernhard Mecking, K. V. Dharmawardane, Dinko Pocanic, Larry Weinstein, Marco A. Huertas, M. Battaglieri, R. Bradford, K. Lukashin, W. J. Briscoe, R. C. Minehart, C. A. Meyer, S. E. Kuhn, E. Pasyuk, D. Doughty, M. Bellis, G. V. Fedotov, Daniel S. Carman, J. J. Manak, S. A. Dytman, N. A. Baltzell, Sylvain Bouchigny, L. C. Maximon, R. J. Feuerbach, J. Hu, B. M. Preedom, D. Heddle, Laird Kramer, G. Audit, C. E. Hyde-Wright, K. Livingston, J. P. Cummings, K. A. Griffioen, G. Ricco, P. Rossi, M. Guillo, C. Tur, A. Coleman, H. R. Weller, D. P. Weygand, R. A. Schumacher, J. Donnelly, G. Asryan, L. Elouadrhiri, W. Kim, S. McAleer, G. Niculescu, F. X. Girod, O. P. Dzyubak, R. A. Niyazov, V. Batourine, Lorenzo Zana, Shifeng Chen, J. Kuhn, M. Kossov, J. D. Kellie, J. Shaw, I. I. Strakovsky, G. Gavalian, J. P. Santoro, Alexei V. Klimenko, S. Tkachenko, E. De Sanctis, Michael Wood, P. Corvisiero, M. Bektasoglu, E. Anciant, M. Nozar, A. Deur, E. Wolin, S. Bültmann, N. Benmouna, M. Ripani, J. R. Calarco, V. S. Serov, T. A. Forest, B. Carnahan, D. I. Sober, N. Guler, Y. Prok, Barry Ritchie, A. I. Ostrovidov, A. C S Lima, H. S. Jo, Friedrich Klein, S. Stepanyan, Roy Thompson, J. Langheinrich, J. Pierce, Avraham Klein, K. Park, S. S. Stepanyan, M. Khandaker, S. A. Philips, D. G. Ireland, J. T. Goetz, J. P. Ball, G. S. Mutchler, Gerald Feldman, P. Coltharp, W. K. Brooks, F. W. Hersman, Cynthia Marie Hadjidakis, Michael Dugger, K. Wang, Brian Raue, G. E. Dodge, C. Salgado, P. Stoler, H. O. Funsten, V. P. Kubarovsky, N. Baillie, Volker D. Burkert, A. S. Biselli, S. Barrow, M. M. Ito, D. G. Crabb, Elton Smith, H. Denizli, P. V. Degtyarenko, J. W. Price, A. Empl, O. Pogorelko, Valeria Muccifora, Y. Ilieva, P. Eugenio, Susan Taylor, M. Guidal, M. Osipenko, F. Sabatié, S. Strauch, K. Hicks, M. Anghinolfi, M. Taiuti, A. V. Skabelin, P. Dragovitsch, James Mueller, H. Egiyan, K. Beard, D. Lawrence, B. L. Berman, M. Holtrop, P. D. Rubin, Gerard Gilfoyle, Y. G. Sharabian, L. M. Qin, Nicola Bianchi, Federico Ronchetti, Kalvir S. Dhuga, R. A. Miskimen, B. McKinnon, S. Niccolai, G. V. O'Rielly, P. Collins, M. D. Mestayer, Kwangsoo Kim, G. Riccardi, D. Protopopescu, P. Nadel-Turonski, S. Pozdniakov, M. Garçon, J. Hardie, Tsutomu Mibe, C. Butuceanu, A. Shafi, H. G. Juengst, Michael L. Williams, Hall Crannell, C. Marchand, D. G. Jenkins, C. Paterson, M. Klusman, D. Branford, M. Mirazita, J. M. Laget, A.V. Stavinsky, D. J. Tedeschi, S. Boiarinov, R. W. Gothe, I. Bedlinskiy, K. Y. Kim, U. Thoma, Michael Vineyard, B. E. Stokes, G. S. Adams, J. Lachniet, V. Gyurjyan, A. Tkabladze, D. Rowntree, K. Joo, J. Zhang, H. Bagdasaryan, L. Guo, M. Spraker, M. Ungaro, J. Yun, D. Cords, A. Yegneswaran, R. S. Hakobyan, P. L. Cole, G. Rosner, R. Nasseripour, R. DeVita, J. W C McNabb, B. B. Niczyporuk, N. Pivnyuk, J. Napolitano, S. A. Morrow, C. Djalali, P. Ambrozewicz, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Thomas Jefferson National Accelerator Facility (Jefferson Lab), and CLAS
Subjects: Photon, Proton, eta meson resonances, FOS: Physical sciences, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 13.60.Le, 14.20.Gk, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Spin-½, Physics, Spectrometer, 010308 nuclear & particles physics, Scattering, Coupling (probability), meson photoproduction, photon-proton interactions, Mass spectrum, N channel, High Energy Physics::Experiment, baryon resonances, Atomic physics
Abstract: Differential cross sections for the reaction gamma p -> eta-prime p have been measured with the CLAS spectrometer and a tagged photon beam with energies from 1.527 to 2.227 GeV. The results reported here possess much greater accuracy than previous measurements. Analyses of these data indicate for the first time the coupling of the etaprime N channel to both the S_11(1535) and P_11(1710) resonances, known to couple strongly to the eta N channel in photoproduction on the proton, and the importance of j=3/2 resonances in the process., 6 pages, 3 figures
Published: 2006
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40. MEASUREMENT OF DEEPLY VIRTUAL COMPTON SCATTERING WITH A POLARIZED PROTON TARGET

Author: B. E. Bonner, H. Avakian, Marco A. Huertas, D. Doughty, Sylvain Bouchigny, Daniel S. Carman, P. Rossi, S. Barrow, W. J. Briscoe, V. Batourine, C. E. Hyde-Wright, S. A. Dytman, P. Nadel-Turonski, Tsutomu Mibe, Y. Ilieva, B. Carnahan, Sergey Kuleshov, Ji Li, M. Bektasoglu, E. Wolin, M. Ripani, M. Nozar, R. J. Feuerbach, P. Coltharp, A. V. Vlassov, M. D. Mestayer, J. Langheinrich, S. S. Stepanyan, E. Pasyuk, S. A. Philips, M. Khandaker, E. L. Isupov, V. Sapunenko, J. Kuhn, B. McKinnon, J. P. Ball, Y. Prok, M. M. Ito, Michael L. Williams, J. Shaw, Michael Wood, S. Strauch, A. I. Ostrovidov, A. C S Lima, L. Todor, S. Boiarinov, K. Hafidi, D. Protopopescu, Friedrich Klein, D. J. Tedeschi, S. Pozdniakov, M. Garçon, B. L. Berman, H. Y. Lu, D. Branford, M. Guidal, R. W. Gothe, D. G. Ireland, D. G. Crabb, L. M. Qin, Hall Crannell, V. S. Serov, M. Mirazita, J. M. Laget, A. Yegneswaran, Volker D. Burkert, A. S. Biselli, K. Y. Kim, G. Rosner, K. Park, M. Bellis, R. Nasseripour, M. Holtrop, C. Paterson, R. Suleiman, G. S. Mutchler, K.H. Hicks, D. P. Watts, H. Egiyan, N. A. Baltzell, M. Klusman, Michael Vineyard, M. Osipenko, F. Sabatié, Laird Kramer, K. A. Griffioen, B. E. Stokes, P. Stoler, B. M. Preedom, N. Markov, V. Crede, G. S. Adams, K. Beard, L. C. Smith, M. Amarian, Lorenzo Zana, J. P. Santoro, B. S. Ishkhanov, P. Eugenio, Federico Ronchetti, V. P. Kubarovsky, J. R. Calarco, Kalvir S. Dhuga, Nikolay Shvedunov, H. Hakobyan, R. A. Schumacher, M. Taiuti, H. S. Jo, W. Kim, G. Niculescu, Gerard Gilfoyle, M. R. Niroula, M. MacCormick, I. Hleiqawi, S. L. Careccia, J. D. Kellie, U. Thoma, Gerald Feldman, C. Salgado, N. Guler, S. Niccolai, M. Battaglieri, P. Collins, N. Natasha, E. De Sanctis, K. L. Giovanetti, S. Bültmann, L. Morand, Larry Weinstein, T. A. Forest, D. I. Sober, R. Fatemi, S. Stepanyan, N. Baillie, J. Hardie, K. S. Egiyan, R. Bradford, K. Lukashin, J. Pierce, Avraham Klein, B. Zhao, G. E. Dodge, E. Golovatch, K. Mikhailov, P. V. Degtyarenko, P. Bosted, I. Niculescu, D. Lawrence, A. Cazes, Maryam Moteabbed, Bernhard Mecking, R. De Masi, F. W. Hersman, C. D. Keith, K. V. Dharmawardane, S. Tkachenko, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, Kwangsoo Kim, G. Riccardi, B. A. Raue, Cynthia Marie Hadjidakis, Chaden Djalali, C. Butuceanu, Michael Dugger, H. O. Funsten, P. Corvisiero, H. G. Juengst, G. Gavalian, H. Denizli, N. Benmouna, A.V. Stavinsky, I. Bedlinskiy, A. V. Skabelin, Marc Vanderhaeghen, Barry Ritchie, Victor Mokeev, L. Guo, M. Ungaro, Latifa Elouadrhiri, K. Joo, R. C. Minehart, C. A. Meyer, J. Yun, D. Cords, G. V. Fedotov, D. P. Weygand, J. Zhang, M. Guillo, H. Bagdasaryan, I. I. Strakovsky, A. Deur, W. K. Brooks, J. Lachniet, A. Tkabladze, D. Rowntree, G. V. O'Rielly, R. S. Hakobyan, L. El Fassi, Z. W. Zhao, D. G. Jenkins, B. B. Niczyporuk, P. L. Cole, S. McAleer, F. X. Girod, N. Pivnyuk, D. Heddle, J. Napolitano, Giovanni Ricco, Atilla Gonenc, J. W. Price, O. Pogorelko, R. Miskimen, R. DeVita, J. W C McNabb, S. A. Morrow, P. Ambrozewicz, Shifeng Chen, J. P. Cummings, M. Kossov, I. Popa, J. T. Goetz, E. Polli, V. Gyurjyan, Dinko Pocanic, S. E. Kuhn, C. Tur, Elton Smith, M. Anghinolfi, James Mueller, P. D. Rubin, Y. G. Sharabian, K. Livingston, L. C. Dennis, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CEA- Saclay (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Photon, Proton, Nuclear Theory, media_common.quotation_subject, General Physics and Astronomy, FOS: Physical sciences, Parton, Electron, 01 natural sciences, Asymmetry, High Energy Physics - Experiment, Nuclear physics, Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), GENERALIZED PARTON DISTRIBUTIONS, CLAS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, NUCLEON, Spin-½, media_common, Physics, 010308 nuclear & particles physics, Compton scattering, High Energy Physics - Phenomenology, High Energy Physics::Experiment, GENERALIZED PARTON DISTRIBUTIONS, NUCLEON, CLAS, 13.60.Fz, 13.60.Hb, 14.20.Dh, Nucleon
Abstract: The longitudinal target-spin asymmetry A_UL for the exclusive electroproduction of high energy photons was measured for the first time in p(e,e'p\gamma). The data have been accumulated at Jefferson Lab with the CLAS spectrometer using 5.7 GeV electrons and a longitudinally polarized NH_3 target. A significant azimuthal angular dependence was observed, resulting from the interference of the Deeply Virtual Compton Scattering and Bethe-Heitler processes. The amplitude of the sin(phi) moment is 0.252 +/- 0.042(stat) +/- 0.020(sys). Theoretical calculations are in good agreement with the magnitude and the kinematic dependence of the target-spin asymmetry, which is sensitive to the generalized parton distributions H and H-tilde., Comment: Modified text slightly, added references
Published: 2006
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41. MEASUREMENT OF THE N ---> DELTA+(1232) TRANSITION AT HIGH MOMENTUM TRANSFER BY PI0 ELECTROPRODUCTION

Author: M, Ungaro, P, Stoler, I, Aznauryan, V D, Burkert, K, Joo, L C, Smith, G, Adams, M, Amarian, P, Ambrozewicz, M, Anghinolfi, G, Asryan, G, Audit, H, Avakian, H, Bagdasaryan, J P, Ball, N A, Baltzell, S, Barrow, V, Batourine, M, Battaglieri, I, Bedliski, M, Bektasoglu, M, Bellis, N, Benmouna, B L, Berman, A S, Biselli, B E, Bonner, S, Bouchigny, S, Boiarinov, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, S, Bültmann, C, Butuceanu, J R, Calarco, S L, Careccia, D S, Carman, A, Cazes, S, Chen, P L, Cole, P, Coltharp, D, Cords, P, Corvisiero, D, Crabb, J P, Cummings, E De, Sanctis, R, Devita, P V, Degtyarenko, H, Denizli, L, Dennis, A, Deur, K V, Dharmawardane, C, Djalali, G E, Dodge, J, Donnelly, D, Doughty, M, Dugger, S, Dytman, O P, Dzyubak, H, Egiyan, K S, Egiyan, L, Elouadrhiri, P, Eugenio, R, Fatemi, G, Fedotov, G, Feldman, R J, Feuerbach, H, Funsten, M, Garçon, G, Gavalian, G P, Gilfoyle, K L, Giovanetti, F X, Girod, J, Goetz, C I O, Gordon, R W, Gothe, K A, Griffioen, M, Guidal, M, Guillo, N, Guler, L, Guo, V, Gyurjyan, C, Hadjidakis, R S, Hakobyan, J, Hardie, D, Heddle, F W, Hersman, I, Hleiqawi, M, Holtrop, K, Hicks, C E, Hyde-Wright, Y, Ilieva, D G, Ireland, B S, Ishkhanov, M M, Ito, D, Jenkins, H S, Jo, H G, Juengst, J D, Kellie, M, Khandaker, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Kossov, L H, Kramer, V, Kubarovsky, J, Kuhn, S E, Kuhn, J, Lachniet, J M, Laget, J, Langheinrich, D, Lawrence, T, Lee, Ji, Li, K, Livingston, C, Marchand, N, Markov, S, McAleer, B, McKinnon, J W C, McNabb, B A, Mecking, S, Mehrabyan, J J, Melone, M D, Mestayer, C A, Meyer, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Mokeev, L, Morand, S A, Morrow, J, Mueller, G S, Mutchler, J, Napolitano, R, Nasseripour, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, M, Niroula, R A, Niyazov, M, Nozar, G V, O'rielly, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, S A, Philips, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, B A, Raue, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, P, Rossi, P D, Rubin, F, Sabatié, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, A V, Skabelin, E S, Smith, D I, Sober, A, Stavinsky, S S, Stepanyan, S, Stepanyan, B E, Stokes, I I, Strakovsky, S, Strauch, M, Taiuti, D J, Tedeschi, U, Thoma, A, Tkabladze, L, Todor, S, Tkachenko, C, Tur, M F, Vineyard, A V, Vlassov, L B, Weinstein, D P, Weygand, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, L, Zana, B, Zhang, J, Zhang, and B, Zhao
Abstract: We report a new measurement of the exclusive electroproduction reaction gamma(*)p--pi(0)p to explore the evolution from soft nonperturbative physics to hard processes via the Q(2) dependence of the magnetic (M(1+)), electric (E(1+)), and scalar (S(1+)) multipoles in the N--Delta transition. 9000 differential cross section data points cover W from threshold to 1.4 GeV/c(2), 4pi center-of-mass solid angle, and Q(2) from 3 to 6 GeV(2)/c(2), the highest yet achieved. It is found that the magnetic form factor G(M)(*) decreases with Q(2) more steeply than the proton magnetic form factor, the ratio E(1+)/M(1+) is small and negative, indicating strong helicity nonconservation, and the ratio S(1+)/M(1+) is negative, while its magnitude increases with Q(2).
Published: 2006

42. Measurement of the polarized structure functionσLT'for pion electroproduction in the Roper-resonance region

Author: H. Avakian, L. Elouadrhiri, V. Gyurjyan, J. Zhang, H. Bagdasaryan, A.V. Stavinsky, M. Osipenko, V. Batourine, E. Anciant, L. Guo, M. Ungaro, P. Stoler, R. Fatemi, D. J. Tedeschi, I. I. Strakovsky, A. Deur, A. V. Vlassov, K. Joo, N. A. Baltzell, R. A. Niyazov, J. Yun, D. Cords, A. Yegneswaran, M. Bektasoglu, R. A. Schumacher, B. Carnahan, F. Sabatié, W. J. Briscoe, E. Pasyuk, Thierry Auger, K. Beard, S. A. Dytman, I. Bedlinskiy, T. Lee, J. P. Cummings, W. K. Brooks, E. Wolin, K. A. Griffioen, S. Strauch, S. O. Nelson, K. Hicks, M. Kossov, Susan Taylor, R. A. Miskimen, B. McKinnon, H. G. Juengst, J. J. Manak, G. Gavalian, M. Khandaker, J. Lachniet, S. Bueltmann, J. Kuhn, Kalvir S. Dhuga, V. Mokeev, Shifeng Chen, T. A. Forest, J. P. Ball, M. Bellis, Patrick Girard, L. C. Maximon, J. Donnelly, G. Asryan, O. P. Dzyubak, N. Benmouna, M. Ripani, D. Rowntree, H. Egiyan, S. Stepanyan, J. Pierce, Avraham Klein, P. Coltharp, J. Shaw, Michael Wood, J. D. Kellie, M. Guillo, D. Doughty, P. Dragovitsch, Sylvain Bouchigny, Roy Thompson, P. Corvisiero, E. De Sanctis, P. Rossi, J. T. Goetz, D. Protopopescu, G. E. Dodge, E. Polli, D. I. Sober, D. Heddle, R. DeVita, S. Niccolai, Federico Ronchetti, D. G. Ireland, J. Hardie, V. Sapunenko, Dinko Pocanic, K. S. Egiyan, D. Branford, D. G. Crabb, S. Pozdniakov, M. Garçon, J. W C McNabb, W. Kim, M. M. Ito, P. V. Degtyarenko, K. Kim, R. S. Hakobyan, K. Mikhailov, V. S. Serov, G. Niculescu, J. R. Calarco, J. Hu, S. E. Kuhn, M. Mirazita, G. Ricco, S. A. Morrow, J. M. Laget, J. H. Kelley, C. Tur, A. Shafi, L. Farhi, G. S. Mutchler, I. Niculescu, C. Djalali, D. Lawrence, Elton Smith, V. Frolov, M. Battaglieri, K. Park, P. Nadel-Turonski, M. Anghinolfi, P. Eugenio, I. Hleiqawi, James Mueller, R. J. Feuerbach, S. L. Careccia, M. Taiuti, R. Bradford, K. Lukashin, A. Coleman, A. I. Ostrovidov, Friedrich Klein, P. D. Rubin, Y. G. Sharabian, P. Ambrozewicz, S. Simionatto, H. R. Weller, Brian Raue, K. Livingston, Michael Dugger, H. O. Funsten, V. P. Kubarovsky, K. L. Giovanetti, B. Asavapibhop, A. Empl, O. Pogorelko, M. Spraker, Larry Weinstein, G. Rosner, R. Nasseripour, C. Marchand, Volker D. Burkert, A. S. Biselli, Alexei V. Klimenko, M. D. Mestayer, L. C. Smith, S. J. Gaff, Bernhard Mecking, B. S. Ishkhanov, Michael L. Williams, K. V. Dharmawardane, Inna Aznauryan, B. E. Stokes, Y. Prok, B. B. Niczyporuk, G. S. Adams, Laird Kramer, Barry Ritchie, S. Boiarinov, N. Pivnyuk, J. Napolitano, G. Riccardi, N. Guler, N. Baillie, C. Butuceanu, G. A. Peterson, Valeria Muccifora, Gerard Gilfoyle, P. L. Cole, J. Langheinrich, C. Cetina, Michael Vineyard, A. V. Skabelin, S. S. Stepanyan, S. A. Philips, B. M. Preedom, S. Barrow, R. C. Minehart, C. A. Meyer, G. V. Fedotov, Lorenzo Zana, J. P. Santoro, B. L. Berman, M. Guidal, L. M. Qin, A. Tkabladze, Y. Ilieva, D. P. Weygand, H. S. Jo, Gerald Feldman, M. Holtrop, M. Klusman, K. Wang, C. Salgado, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Nozar, Nicola Bianchi, R. W. Gothe, K. Y. Kim, U. Thoma, F. W. Hersman, S. McAleer, F. X. Girod, J. W. Price, G. V. O'Rielly, D. G. Jenkins, K. Sabourov, L. C. Dennis, and B. E. Bonner
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Roper resonance, 010308 nuclear & particles physics, Structure function, Sigma, Electron, Polarization (waves), 01 natural sciences, Pion, Amplitude, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Beam energy
Abstract: The polarized longitudinal-transverse structure function {sigma}{sub LT{sup '}} measures the interference between real and imaginary amplitudes in pion electroproduction and can be used to probe the coupling between resonant and nonresonant processes. We report new measurements of {sigma}{sub LT{sup '}} in the N(1440)(1/2){sup +} (Roper) resonance region at Q{sup 2}=0.40 and 0.65GeV{sup 2} for both the {pi}{sup 0}p and {pi}{sup +}n channels. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS) using longitudinally polarized electrons at a beam energy of 1.515 GeV. Complete angular distributions were obtained and are compared to recent phenomenological models. The {sigma}{sub LT{sup '}}({pi}{sup +}n) channel shows a large sensitivity to the Roper-resonance multipoles M{sub 1-} and S{sub 1-} and provides new constraints on models of resonance formation.
Published: 2005
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43. Erratum: Radiative decays of theΣ0(1385)andΛ(1520)hyperons [Phys. Rev. C71, 054609 (2005)]

Author: A. V. Vlassov, T. Lee, M. Spraker, Michael Vineyard, G. V. O'Rielly, B. E. Stokes, G. S. Adams, D. G. Jenkins, B. S. Raue, J. P. Santoro, R. DeVita, J. W C McNabb, L. Todor, Roy Thompson, Kwangsoo Kim, G. Riccardi, C. Butuceanu, D. Protopopescu, S. Pozdniakov, M. Garçon, E. Wolin, J. P. Ball, Y. Prok, D. S. Carman, D. G. Crabb, Yordanka Ilieva, Ji Li, W. Kim, J. P. Cummings, R. A. Schumacher, L. Elouadrhiri, M. Kossov, Rakhsha Nasseripour, K. S. Egiyan, I. I. Strakovsky, V. Koubarovski, C. I O Gordon, M. Bellis, K. Mikhailov, M. M. Ito, M. Nozar, A. Deur, E. De Sanctis, L. Morand, T. A. Forest, S. Stepanyan, Federico Ronchetti, D. I. Sober, A. Empl, O. Pogorelko, L. C. Dennis, B. E. Bonner, G. Ricco, G. S. Mutchler, H. Avakian, V. Batourine, C. A. Meyer, E. Golovatch, G. Asryan, S. Bültmann, B. Carnahan, O. P. Dzyubak, R. A. Niyazov, W. J. Briscoe, E. Pasyuk, F. Sabatié, J. D. Kellie, S. A. Dytman, M. D. Mestayer, J. J. Manak, P. Corvisiero, M. Anghinolfi, U. Thoma, H. R. Weller, G. E. Dodge, Frank Klein, James Mueller, P. V. Degtyarenko, K. Kim, K. V. Dharmawardane, L. C. Smith, J. Shaw, D. P. Weygand, Michael Wood, Y. G. Sharabian, S. A. Morrow, P. Stoler, I. Niculescu, A. Shafi, P. Rubin, C. Djalali, S. Boiarinov, D. Lawrence, M. Guillo, J. Langheinrich, K. Hicks, V. S. Serov, M. Osipenko, S. A. Philips, Shifeng Chen, William Brooks, G. Rosner, Hall Crannell, H. Denizli, V. Sapunenko, C. Marchand, Valeria Muccifora, B. L. Berman, M. Battaglieri, L. M. Qin, P. Ambrozewicz, F. W. Hersman, H. Juengst, A. I. Ostrovidov, A. C S Lima, K. Park, Gerard Gilfoyle, E. Polli, M. Klusman, R. W. Gothe, G. Audit, C. E. Hyde-Wright, A. V. Skabelin, R. J. Feuerbach, Dinko Pocanic, M. Bektasoglu, Alexei V. Klimenko, R. Bradford, B. A. Mecking, Volker D. Burkert, A. S. Biselli, S. E. Kuhn, Cynthia Marie Hadjidakis, B. M. Preedom, M. Guidal, Barry Ritchie, G. Niculescu, P. Eugenio, Stephen Taylor, S. McAleer, M. Taiuti, K. A. Griffioen, Michael Dugger, M. Holtrop, H. O. Funsten, B. B. Niczyporuk, S. Strauch, J. J. Melone, Laird Kramer, D. G. Ireland, N. Pivnyuk, Lorenzo Zana, J. R. Calarco, K. Lukashin, J. Napolitano, R. A. Miskimen, Carlos A. Salgado, D. Branford, J. Hu, Gerald Feldman, M. Mirazita, J. M. Laget, K. Wang, N. Benmouna, M. Ripani, E. S. Smith, Marco A. Huertas, Sylvain Bouchigny, P. Rossi, Mark Richard James Williams, P. Dragovitsch, S. Niccolai, J. Hardie, A.V. Stavinsky, D. J. Tedeschi, K. Beard, Andreas Klein, G. Gavalian, V. Mokeev, D. Doughty, D. Heddle, J. Lachniet, A. Tkabladze, H. Egiyan, E. Anciant, C. S. Whisnant, D. Rowntree, M. Khandaker, V. Gyurjyan, K. Livingston, R. S. Hakobyan, N. Guler, H. Bagdasaryan, J. W. Price, L. Guo, S. Barrow, M. Ungaro, I. Hleiqawi, K. Joo, J. Yun, D. Cords, S. S. Stepanyan, A. Yegneswaran, R. G. Fersch, S. Simionatto, P. L. Cole, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, Clarisse Tur, Jens H. Kuhn, Nicola Bianchi, R. Suleiman, and R. Fatemi
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Hyperon, Radiative decay, Radiative transfer, Sigma, Lambda, Particle identification
Published: 2005
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44. Beam-Helicity Asymmetries in Double-Charged-Pion Photoproduction on the Proton

Author: D. Doughty, G. Ricco, C. Bennhold, Hall Crannell, D. Heddle, K. S. Egiyan, K. Mikhailov, C. Marchand, Shifeng Chen, R. Fatemi, J. Zhang, Gerard Gilfoyle, Marco A. Huertas, A. V. Vlassov, T. Lee, A.V. Stavinsky, Mokeev, R. A. Miskimen, B. McKinnon, M. Guidal, G. Niculescu, B. L. Berman, L. M. Qin, H. Bagdasaryan, J. W. Price, R. A. Schumacher, J. P. Cummings, J. T. Goetz, E. Polli, D. Branford, M. Mirazita, J. M. Laget, Cynthia Marie Hadjidakis, C. Paterson, Brian Raue, Chaden Djalali, Michael Dugger, D. J. Tedeschi, M. Holtrop, S. Strauch, H. Egiyan, L. Guo, M. Ungaro, M. Klusman, R. C. Minehart, J. Lachniet, A. Tkabladze, H. O. Funsten, A. I. Ostrovidov, A. C S Lima, K. Park, L. C. Smith, M. Nozar, T. A. Forest, M. Khandaker, D. Rowntree, S. Stepanyan, Dinko Pocanic, N. Baillie, C. A. Meyer, Calarco, G. V. Fedotov, Sylvain Bouchigny, D. G. Ireland, J. Pierce, M. Kossov, B. S. Ishkhanov, S. E. Kuhn, G. E. Dodge, A. Fix, R. S. Hakobyan, P. Stoler, P. Rossi, I. Bedlinskiy, Daniel S. Carman, S. McAleer, B. Carnahan, F. Sabatié, I. Hleiqawi, K. Joo, Volker D. Burkert, A. S. Biselli, F. X. Girod, G. Audit, Andreas Klein, C. E. Hyde-Wright, S. L. Careccia, Rakhsha Nasseripour, Stephen Taylor, J. Yun, D. P. Weygand, D. Cords, P. V. Degtyarenko, K. Kim, S. S. Stepanyan, A. Yegneswaran, K. Hicks, Elton Smith, K. L. Giovanetti, B. Asavapibhop, H. Denizli, M. Bektasoglu, Larry Weinstein, G. Gavalian, I. Niculescu, D. Lawrence, S. Tkachenko, M. Anghinolfi, Clarisse Tur, P. Nadel-Turonski, Y. Ilieva, James Mueller, N. Benmouna, M. Ripani, E. De Sanctis, Carlos A. Salgado, Laird Kramer, Tsutomu Mibe, R. Suleiman, J. Langheinrich, S. Bültmann, S. A. Philips, Muccifora, Y. G. Sharabian, Federico Ronchetti, A. V. Skabelin, D. I. Sober, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, Alexei V. Klimenko, P. Dragovitsch, Gyurjyan, W. Kim, P. Coltharp, F. W. Hersman, Barry Ritchie, S. Niccolai, P. Corvisiero, M. M. Ito, Batourine, J. Hardie, G. V. O'Rielly, D. G. Jenkins, R. W. Gothe, Kwangsoo Kim, A. Coleman, M. Osipenko, K. Beard, Winston Roberts, Kalvir S. Dhuga, U. Thoma, C. Butuceanu, Jens H. Kuhn, G. Riccardi, L. Elouadrhiri, R. DeVita, J. W C McNabb, Bernhard Mecking, L. Todor, K. V. Dharmawardane, D. Protopopescu, S. A. Morrow, P. Rubin, A. Deur, S. Pozdniakov, M. Bellis, P. L. Cole, W. K. Brooks, A. Shafi, P. Ambrozewicz, H. Juengst, J. Hu, E. Wolin, K. Livingston, M. Battaglieri, J. P. Ball, R. Bradford, Y. Prok, B. B. Niczyporuk, D. G. Crabb, N. Guler, Sapunenko, N. Pivnyuk, K. Lukashin, J. Napolitano, S. Barrow, Michael Vineyard, J. J. Manak, Michael L. Williams, S. Boiarinov, B. M. Preedom, P. Eugenio, M. Taiuti, Lorenzo Zana, H. S. Jo, Gerald Feldman, K. Wang, J. P. Santoro, Roy Thompson, G. Rosner, B. E. Stokes, G. S. Adams, G. S. Mutchler, N. A. Baltzell, K. A. Griffioen, Mestayer, J. D. Kellie, Frank Klein, J. Shaw, Strakovsky, Michael Wood, V. S. Serov, L. C. Dennis, H. Avakian, W. J. Briscoe, E. Pasyuk, S. A. Dytman, A. Empl, O. Pogorelko, Kubarovsky, R. J. Feuerbach, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and CLAS
Subjects: Particle physics, Photon, Proton, General Physics and Astronomy, FOS: Physical sciences, 13.60.-r, 13.60.Le, 13.88.+e, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, 0103 physical sciences, Phenomenological model, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Bremsstrahlung, Helicity, 3. Good health, Pair production, Nucleon
Abstract: Beam-helicity asymmetries for the two-pion-photoproduction reaction gamma + p --> p pi+ pi- have been studied for the first time in the resonance region for center-of-mass energies between 1.35 GeV and 2.30 GeV. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer using circularly polarized tagged photons incident on an unpolarized hydrogen target. Beam-helicity-dependent angular distributions of the final-state particles were measured. The large cross-section asymmetries exhibit strong sensitivity to the kinematics and dynamics of the reaction. The data are compared with the results of various phenomenological model calculations, and show that these models currently do not provide an adequate description for the behavior of this new observable., 6 pages, 4 figures, submitted to Physical Review Letters
Published: 2005
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45. Radiative decays of theΣ0(1385)andΛ(1520)hyperons

Author: P. Dragovitsch, G. Gavalian, R. DeVita, M. Guidal, N. Benmouna, M. Ripani, S. Niccolai, J. W C McNabb, Hall Crannell, M. Holtrop, E. Anciant, Alexei V. Klimenko, J. Hardie, S. Strauch, C. Marchand, J. P. Cummings, M. Kossov, Rakhsha Nasseripour, R. A. Miskimen, H. G. Juengst, S. A. Morrow, R. Fatemi, Federico Ronchetti, M. Khandaker, Barry Ritchie, D. Branford, R. A. Schumacher, C. Djalali, A. V. Vlassov, Ji Li, T. Lee, Daniel S. Carman, Cynthia Marie Hadjidakis, Marco A. Huertas, M. Mirazita, J. M. Laget, A.V. Stavinsky, M. Bellis, C. I O Gordon, G. Audit, G. Ricco, Michael Dugger, P. Ambrozewicz, C. E. Hyde-Wright, M. D. Mestayer, G. Asryan, H. O. Funsten, D. J. Tedeschi, K. Livingston, L. Morand, T. A. Forest, C. S. Whisnant, Michael L. Williams, I. Hleiqawi, O. P. Dzyubak, R. A. Niyazov, A. I. Ostrovidov, V. Sapunenko, A. C S Lima, S. Boiarinov, S. Stepanyan, Avraham Klein, Sylvain Bouchigny, B. M. Preedom, S. Simionatto, G. V. O'Rielly, J. Hu, Dinko Pocanic, P. Corvisiero, M. Bektasoglu, D. G. Ireland, M. Nozar, P. Rossi, B. B. Niczyporuk, J. J. Manak, L. C. Smith, Lorenzo Zana, J. P. Santoro, J. Kuhn, K. L. Giovanetti, B. Asavapibhop, Friedrich Klein, H. Denizli, G. E. Dodge, D. G. Jenkins, M. Spraker, Larry Weinstein, B. S. Raue, N. Pivnyuk, Volker D. Burkert, A. S. Biselli, D. Doughty, J. Napolitano, R. J. Feuerbach, Gerald Feldman, M. Battaglieri, R. G. Fersch, K. Wang, S. E. Kuhn, P. Stoler, J. Langheinrich, P. V. Degtyarenko, K. Kim, D. Heddle, C. Salgado, S. McAleer, Laird Kramer, B. L. Berman, L. M. Qin, Hovanes Egiyan, Roy Thompson, S. S. Stepanyan, S. A. Philips, J. Lachniet, R. Bradford, K. Lukashin, I. Niculescu, D. Rowntree, A. V. Skabelin, C. Tur, Stephen Taylor, K. Hicks, N. Guler, D. Lawrence, K. S. Egiyan, E. De Sanctis, V. Gyurjyan, M. Klusman, V. Koubarovski, Michael Vineyard, Valeria Muccifora, R. S. Hakobyan, K. Mikhailov, L. Todor, Shifeng Chen, J. W. Price, J. R. Calarco, H. Bagdasaryan, V. Batourine, D. I. Sober, B. Carnahan, L. Guo, M. Ungaro, Gerard Gilfoyle, P. L. Cole, S. Barrow, P. Eugenio, Bernhard Mecking, E. Polli, K. V. Dharmawardane, M. Taiuti, Elton Smith, J. Yun, D. Cords, H. R. Weller, M. Anghinolfi, A. Yegneswaran, G. Rosner, James Mueller, P. D. Rubin, Y. G. Sharabian, C. A. Meyer, Y. Ilieva, J. J. Melone, A. Tkabladze, D. P. Weygand, Nicola Bianchi, M. M. Ito, K. A. Griffioen, D. Protopopescu, S. Pozdniakov, M. Garçon, A. Shafi, B. E. Stokes, G. S. Adams, J. D. Kellie, K. Joo, R. Suleiman, G. S. Mutchler, M. Guillo, E. Golovatch, L. Elouadrhiri, I. I. Strakovsky, A. Deur, W. K. Brooks, M. Osipenko, F. Sabatié, K. Beard, W. Kim, G. Niculescu, F. W. Hersman, R. W. Gothe, K. Y. Kim, U. Thoma, V. Mokeev, S. Bültmann, E. Wolin, J. P. Ball, Y. Prok, D. G. Crabb, G. Riccardi, C. Butuceanu, K. Park, A. Empl, O. Pogorelko, L. C. Dennis, B. E. Bonner, H. Avakian, W. J. Briscoe, E. Pasyuk, S. A. Dytman, J. Shaw, Michael Wood, and V. S. Serov
Subjects: Physics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Lambda, Lambda baryon, 01 natural sciences, Particle identification, Sigma baryon, Nuclear physics, Baryon, Particle decay, 0103 physical sciences, Radiative transfer, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: The electromagnetic decays of the Sig0(1385) and Lambda(1520) hyperons were studied in photon-induced reactions gamma p -> K+ Lambda(1116)gamma in the CLAS detector at the Thomas Jefferson National Accelerator Facility. We report the first observation of the radiative decay of the Sig0(1385) and a measurement of the Lambda(1520) radiative decay width. For the Sig0(1385) -> Lambda(1116)gamma transition, we measured a partial width of 479+/-120(stat)+81-100(sys) keV, larger than all of the existing model predictions. For the Lambda(1520) -> Lambda(1116)gamma transition, we obtained a partial width of 167+/-43(stat)+26-12(sys) keV.
Published: 2005
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46. Exclusive photoproduction of the cascade ($\Xi$) hyperons

Author: Alexei V. Klimenko, R. J. Feuerbach, D. Doughty, L. Elouadrhiri, Barry Ritchie, D. Heddle, Laird Kramer, K. Park, G. Rosner, L. C. Smith, S. J. Gaff, G. Ricco, I. I. Strakovsky, David Jenkins, R. Fatemi, A. V. Vlassov, Shifeng Chen, F. W. Hersman, E. Wolin, J. Kuhn, V. P. Kubarovsky, Hovanes Egiyan, Hall Crannell, A. Empl, K. Livingston, O. Pogorelko, P. Stoler, W. K. Brooks, R. W. Gothe, Roy Thompson, J. J. Melone, Friedrich Klein, L. C. Dennis, K. Y. Kim, H. Denizli, U. Thoma, H. Avakian, Brian Raue, C. Marchand, M. Osipenko, B. M. Preedom, V. Sapunenko, Valeria Muccifora, Sylvain Bouchigny, J. P. Ball, Y. Prok, M. Eckhause, J. J. Manak, Y. Kuang, M. Sanzone-Arenhovel, S. O. Nelson, Susan Taylor, K. Hicks, G. V. O'Rielly, J. Connelly, A. V. Skabelin, Gerard Gilfoyle, B. B. Niczyporuk, E. Anciant, W. J. Briscoe, E. Pasyuk, J. T. Goetz, K. S. Egiyan, K. Beard, J. P. Santoro, E. Polli, P. Eugenio, M. Taiuti, N. Pivnyuk, J. Napolitano, R. A. Miskimen, H. G. Juengst, D. G. Crabb, G. S. Mutchler, N. Guler, S. A. Dytman, G. E. Dodge, M. Khandaker, P. V. Degtyarenko, K. Kim, K. Sabourov, J. P. Cummings, C. A. Meyer, A.V. Stavinsky, P. Rossi, G. A. Peterson, Elton Smith, K. Mikhailov, W. Major, W. Kim, S. McAleer, M. Kossov, I. Niculescu, V. Gyurjyan, D. Lawrence, G. Niculescu, B. E. Stokes, G. S. Adams, Federico Ronchetti, D. Branford, M. Mirazita, J. M. Laget, K. Wang, C. Salgado, A. Tkabladze, P. L. Cole, J. Lachniet, B. M. K. Nefkens, D. Rowntree, V. Frolov, K. Joo, S. Barrow, D. J. Tedeschi, S. Strauch, Rakhsha Nasseripour, D. P. Weygand, M. Anghinolfi, D. G. Ireland, M. Guillo, R. A. Schumacher, James Mueller, J. Shaw, Michael Wood, L. Farhi, P. D. Rubin, M. M. Ito, J. R. Calarco, J. W. Price, G. Riccardi, I. Hleiqawi, S. Simionatto, Y. G. Sharabian, V. S. Serov, R. DeVita, Ji Li, H. Bagdasaryan, C. Butuceanu, J. W C McNabb, M. Bellis, R. S. Hakobyan, Dinko Pocanic, C. I O Gordon, D. Hancock, K. L. Giovanetti, B. Asavapibhop, K. A. Griffioen, D. Protopopescu, A. Coleman, M. D. Mestayer, S. A. Morrow, H. R. Weller, C. Djalali, M. Spraker, Larry Weinstein, S. E. Kuhn, S. Pozdniakov, L. Morand, J. H. Kelley, T. A. Forest, Michael L. Williams, J. Hu, C. Tur, S. Stepanyan, A. Shafi, O. P. Dzyubak, J. L. Ducote, S. Boiarinov, P. Ambrozewicz, J. D. Kellie, John T. O'Brien, Avraham Klein, P. Corvisiero, M. Witkowski, Bernhard Mecking, K. V. Dharmawardane, C. Cetina, Y. Ilieva, L. Guo, M. Ungaro, Michael Vineyard, B. Carnahan, L. Todor, F. Sabatié, P. Dragovitsch, M. Battaglieri, Thierry Auger, R. Bradford, K. Lukashin, Nicola Bianchi, R. A. Niyazov, J. Yun, D. Cords, B. L. Berman, L. M. Qin, S. Niccolai, A. Yegneswaran, M. Klusman, J. Hardie, E. De Sanctis, D. I. Sober, A. I. Ostrovidov, Volker D. Burkert, A. S. Biselli, J. Langheinrich, S. A. Philips, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Bektasoglu, M. Nozar, M. Guidal, M. Holtrop, Thomas E. Smith, G. Gavalian, N. Benmouna, M. Ripani, Cynthia Marie Hadjidakis, Michael Dugger, H. O. Funsten, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and CLAS
Subjects: Physics, BARYONS, Nuclear and High Energy Physics, Particle physics, 13.60.Rj, 25.20.Lj, 14.20.Jn, 010308 nuclear & particles physics, Hyperon, FOS: Physical sciences, PENTAQUARKS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Particle identification, INCLUSIVE PHOTOPRODUCTION, PENTAQUARKS, BARYONS, Cascade, Excited state, 0103 physical sciences, Production (computer science), Nuclear Experiment (nucl-ex), 010306 general physics, Ground state, INCLUSIVE PHOTOPRODUCTION, Nuclear Experiment, Spin-½
Abstract: We report on the first measurement of exclusive Xi-(1321) hyperon photoproduction in gamma p --> K+ K+ Xi- for 3.2 < E(gamma) < 3.9 GeV. The final state is identified by the missing mass in p(gamma,K+ K+)X measured with the CLAS detector at Jefferson Laboratory. We have detected a significant number of the ground-state Xi-(1321)1/2+, and have estimated the total cross section for its production. We have also observed the first excited state Xi-(1530)3/2+. Photoproduction provides a copious source of Xi's. We discuss the possibilities of a search for the recently proposed Xi5-- and Xi5+ pentaquarks., submitted to Phys. Rev. C
Published: 2005
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47. Complete measurement of three-body photodisintegration ofHe3for photon energies between 0.35 and1.55GeV

Author: J. P. Ball, Y. Prok, Alexei V. Klimenko, J. R. M. Annand, R. A. Miskimen, H. G. Juengst, L. Guo, M. Ungaro, Barry Ritchie, M. M. Ito, D. Branford, P. Stoler, M. Mirazita, J. M. Laget, A. I. Ostrovidov, A. C S Lima, D. Doughty, A.V. Stavinsky, S. McAleer, Cynthia Marie Hadjidakis, P. Eugenio, K. Joo, A. Coleman, B. B. Niczyporuk, D. G. Crabb, L. C. Smith, D. J. Tedeschi, S. Strauch, N. Pivnyuk, R. A. Schumacher, Marco A. Huertas, R. A. Niyazov, J. Yun, D. Cords, D. Heddle, M. Bellis, J. Napolitano, Dinko Pocanic, Ji Li, M. Guidal, Federico Ronchetti, Michael Dugger, K. Hicks, S. Pozdniakov, Volker D. Burkert, A. S. Biselli, J. P. Cummings, M. Taiuti, S. Stepanyan, Sylvain Bouchigny, K. A. Griffioen, S. E. Kuhn, C. I O Gordon, H. O. Funsten, P. Rossi, J. Hu, G. S. Adams, A. Shafi, J. W. Price, M. D. Mestayer, G. Ricco, M. Holtrop, A. Yegneswaran, D. G. Ireland, H. Denizli, L. Morand, Si Chen, J. R. Calarco, C. Tur, Rolf Ent, R. DeVita, J. W C McNabb, M. Battaglieri, B. L. Berman, T. A. Forest, Michael L. Williams, M. Kossov, S. A. Morrow, C. Djalali, L. M. Qin, P. Heimberg, Andrei Afanasev, I. Popa, K. Livingston, E. De Sanctis, R. Bradford, K. Lukashin, J. D. Kellie, Susan Taylor, P. Ambrozewicz, J. J. Melone, Friedrich Klein, S. Boiarinov, B. M. Preedom, R. J. Feuerbach, L. Y. Murphy, O. P. Dzyubak, Avraham Klein, Brian Raue, Y. Kuang, Daniel S. Carman, V. Gyurjyan, John T. O'Brien, M. Klusman, E. Polli, Laird Kramer, Lorenzo Zana, J. P. Santoro, G. V. O'Rielly, G. Audit, C. E. Hyde-Wright, D. I. Sober, C. S. Whisnant, Elton Smith, J. R. Ficenec, Bernhard Mecking, P. Dragovitsch, K. V. Dharmawardane, Y.Y. Llieva, U. Thoma, N. Guler, D. Protopopescu, H. Bagdasaryan, H. S. Jo, D. G. Jenkins, M. Anghinolfi, Gerald Feldman, Latifa Elouadrhiri, James Mueller, S. Niccolai, Hall Crannell, P. Corvisiero, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, K. Wang, P. D. Rubin, C. Marchand, Y. G. Sharabian, R. C. Minehart, C. Salgado, R. Fatemi, C. A. Meyer, J. Kuhn, G. V. Fedotov, G. Riccardi, B. Carnahan, G. E. Dodge, M. Bektasoglu, C. Armstrong, F. Sabatié, A. V. Vlassov, J. Hardie, M. Guillo, S. Barrow, K. S. Egiyan, P. V. Degtyarenko, K. Kim, M. Khandaker, M. Nozar, C. Butuceanu, I. Niculescu, P. L. Cole, D. Lawrence, Roy Thompson, R. Naseripour, K. Mikhailov, D. P. Weygand, R. Suleiman, A. V. Skabelin, J. Lachniet, J. Langheinrich, G. S. Mutchler, Michael Vineyard, D. Rowntree, L. Todor, S. A. Philips, G. Gavalian, N. Benmouna, M. Ripani, J. J. Manak, R. S. Hakobyan, E. Golovatch, Nicola Bianchi, K. Hleiqawi, G. Rosner, I. I. Strakovsky, W. K. Brooks, M. Osipenko, K. Beard, Kalvir S. Dhuga, L. C. Dennis, B. E. Bonner, W. Kim, G. Niculescu, H. Avakian, W. J. Briscoe, E. Pasyuk, S. A. Dytman, K. Park, A. Empl, O. Pogorelko, F. W. Hersman, J. Shaw, Michael Wood, V. S. Serov, R. W. Gothe, K. Y. Kim, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, Hovanes Egiyan, R. Tkabladze, and E. Wolin
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Spectrometer, 010308 nuclear & particles physics, Hadron, 7. Clean energy, 01 natural sciences, Baryon, Nuclear physics, Momentum, Massless particle, Photodisintegration, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The three-body photodisintegration of 3He has been measured with the CLAS detector at Jefferson Lab, using tagged photons of energies between 0.35 GeV and 1.55 GeV. The large acceptance of the spectrometer allowed us for the first time to cover a wide momentum and angular range for the two outgoing protons. Three kinematic regions dominated by either two- or three-body contributions have been distinguished and analyzed. The measured cross sections have been compared with results of a theoretical model, which, in certain kinematic ranges, have been found to be in reasonable agreement with the data.
Published: 2004
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48. Proton Source Size Measurements in theeA→e′ppXReaction

Author: R. A. Schumacher, P. Eugenio, M. Taiuti, C. I O Gordon, Daniel S. Carman, Sylvain Bouchigny, L. Morand, T. A. Forest, G. Audit, C. E. Hyde-Wright, C. A. Meyer, Muccifora, P. Rossi, H. Bagdasaryan, S. Stepanyan, Enzo De Sanctis, G. Asryan, F. Ronchetti, O. P. Dzyubak, R. A. Niyazov, Avraham Klein, M. Bellis, K. Park, L. M. Qin, I. Hleiqawi, A. Tkabladze, S. McAleer, Shifeng Chen, P. Corvisiero, J. Lachniet, D. Rowntree, R. S. Hakobyan, Susan Taylor, D. P. Weygand, R. Fatemi, A. V. Vlassov, K. S. Egiyan, K. Mikhailov, M. Bektasoglu, M. Nozar, S. Simionatto, M. Klusman, E. Polli, B. E. Stokes, G. S. Adams, A. Empl, O. Pogorelko, K. Lukashin, T. Lee, L. C. Smith, G. E. Dodge, Cynthia Marie Hadjidakis, H. Egiyan, K. Joo, Mokeev, K. L. Giovanetti, B. Asavapibhop, B. B. Niczyporuk, N. Pivnyuk, J. Kuhn, Elton Smith, M. Guidal, Chaden Djalali, Daijin Kim, Alexei V. Klimenko, Michael Dugger, M. Spraker, Larry Weinstein, J. W. Price, M. Anghinolfi, C. Cetina, J. Napolitano, Roy Thompson, James Mueller, C. S. Whisnant, Patrick Girard, J. Shaw, P. V. Degtyarenko, K. Kim, Strakovsky, Barry Ritchie, H. O. Funsten, Michael Vineyard, L. Guo, M. Ungaro, L. Todor, R. W. Gothe, S. A. Morrow, M. Holtrop, J. J. Manak, Michael Wood, Raffaella De Vita, V. S. Serov, E. Anciant, P. D. Rubin, Y. G. Sharabian, B. E. Bonner, H. Avakian, Ji Li, R Lednicky, Dinko Pocanic, S. Mehrabyan, K. Y. Kim, G. V. O'Rielly, Thierry Auger, M. Khandaker, Bernhard Mecking, K. V. Dharmawardane, H. Denizli, E. Pasyuk, S. E. Kuhn, D. G. Jenkins, K. Sabourov, J. Langheinrich, U. Thoma, S. S. Stepanyan, S. A. Philips, S. A. Dytman, G. S. Mutchler, G. Riccardi, I. Niculescu, D. Lawrence, Calarco, P. Stoler, C. Butuceanu, J. H. Kelley, G. Ricco, A.V. Stavinsky, D. Doughty, Michael L. Williams, C. Tur, Sapunenko, J. Yun, D. Cords, A. Yegneswaran, D. Heddle, S. Boiarinov, B. M. Preedom, N. Dashyan, R. G. Fersch, A. V. Skabelin, D. I. Sober, P. L. Cole, LS Vorobeyev, Lorenzo Zana, J. P. Santoro, S. O. Nelson, N. Benmouna, M. Ripani, K. Hicks, K. A. Griffioen, K. Wang, J. J. Melone, Friedrich Klein, C. Salgado, J. D. Kellie, Brian Raue, F. W. Hersman, E. Wolin, D. J. Tedeschi, Mestayer, J. P. Ball, Y. Prok, A. Coleman, H. R. Weller, J. P. Cummings, C. Marchand, M. Kossov, D. G. Crabb, Rakhsha Nasseripour, J. Hu, Shalev Gilad, J. W C McNabb, G. Rosner, M. Battaglieri, P. Dragovitsch, S. Niccolai, L.C. Dennis, R. Bradford, J. Hardie, M. Osipenko, F. Sabatié, M. M. Ito, K. Beard, G. Gavalian, Kubarovski, Gyurjyan, W. Kim, G. Niculescu, Batourine, Gerard Gilfoyle, Kim, R. A. Miskimen, H. G. Juengst, G.A. Leksin, D. Branford, M. Mirazita, J. M. Laget, P Ambrozewich, D. Protopopescu, S. Pozdniakov, M. Garçon, A. I. Ostrovidov, D. G. Ireland, Volker D. Burkert, A. S. Biselli, Nicola Bianchi, K. Livingston, N. Guler, G. A. Peterson, R. J. Feuerbach, Laird Kramer, S. Barrow, M. Guillo, L. Elouadrhiri, A. Deur, and W. K. Brooks
Subjects: Nuclear reaction, Baryon, Physics, Proton, Helium-3, Hadron, General Physics and Astronomy, Atomic physics, Nucleon, Isotopes of helium, Lepton
Abstract: Two-proton correlations at small relative momentum q were studied in the e A ( 3 H e , 4 H e , C , F e ) → e ′ p p X reaction at E 0 = 4.46 G e V using the CLAS detector at Jefferson Lab. The enhancement of the correlation function at small q was found to be in accordance with theoretical expectations. Sizes of the emission region were extracted, and proved to be dependent on A and on the proton momentum. The size of the two-proton emission region for He was measured in e A reactions for the first time.
Published: 2004
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49. Measurement of the polarized structure functionσLT′forp(e⃗,e′π+)nin theΔ(1232)resonance region

Author: K. Joo, L. C. Smith, I. G. Aznauryan, V. D. Burkert, R. Minehart, G. Adams, P. Ambrozewicz, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, H. Bagdasaryan, J. P. Ball, S. Barrow, V. Batourine, M. Battaglieri, K. Beard, M. Bektasoglu, N. Benmouna, N. Bianchi, A. S. Biselli, S. Boiarinov, B. E. Bonner, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, C. Butuceanu, J. R. Calarco, D. S. Carman, B. Carnahan, C. Cetina, S. Chen, L. Ciciani, P. L. Cole, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. De Sanctis, R. DeVita, P. V. Degtyarenko, L. Dennis, A. Deur, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, P. Eugenio, R. Fersch, R. J. Feuerbach, T. A. Forest, H. Funsten, S. J. Gaff, M. Garçon, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, R. W. Gothe, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, J. Hu, C. E. Hyde-Wright, Y. Ilieva, D. Ireland, M. M. Ito, D. Jenkins, H. G. Juengst, J. D. Kellie, J. H. Kelley, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, V. Koubarovski, L. H. Kramer, S. E. Kuhn, J. Kuhn, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, T. Lee, K. Livingston, K. Lukashin, J. J. Manak, C. Marchand, S. McAleer, J. W. C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, L. Morand, S. A. Morrow, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, R. Nasseripour, S. O. Nelson, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, G. V. O’Rielly, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, K. Sabourov, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, J. Shaw, S. Simionatto, A. V. Skabelin, E. S. Smith, D. I. Sober, M. Spraker, A. Stavinsky, S. Stepanyan, S. S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, S. Taylor, D. J. Tedeschi, U. Thoma, R. Thompson, A. Tkabladze, L. Todor, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, H. Weller, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, and L. Zana
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, Elementary particle, 01 natural sciences, Delta baryon, Baryon, Pion, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The polarized longitudinal-transverse structure function {sigma}{sub LT{sup '}} has been measured using the p(e-vector,e{sup '}{pi}{sup +})n reaction in the {delta}(1232) resonance region at Q{sup 2}=0.40 and 0.65 GeV{sup 2}. No previous {sigma}{sub LT{sup '}} data exist for this reaction channel. The kinematically complete experiment was performed at the Jefferson Lab with the CEBAF large acceptance spectrometer using longitudinally polarized electrons at an energy of 1.515 GeV. A partial-wave analysis of the data shows generally better agreement with recent phenomenological models of pion electroproduction compared to the previously measured {pi}{sup 0}p channel. A fit to both {pi}{sup 0}p and {pi}{sup +}n channels using a unitary isobar model suggests the unitarized Born terms provide a consistent description of the nonresonant background. The t-channel pion pole term is important in the {pi}{sup 0}p channel through a rescattering correction, which could be model dependent.
Published: 2004
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50. Survey of A_LT' asymmetries in semi-exclusive electron scattering on He4 and C12

Author: L. Elouadrhiri, J. Kuhn, V. Sapunenko, Valeria Muccifora, Roy Thompson, R. Fatemi, D. Doughty, P. Dragovitsch, M. Battaglieri, Gerard Gilfoyle, D. Heddle, A. V. Vlassov, T. Lee, J. R. Calarco, S. Niccolai, R. Bradford, Y.G. Sharabian, M. Osipenko, F. Sabatié, B. M. Preedom, Shalev Gilad, R. A. Miskimen, J. Hardie, H. G. Juengst, W. K. Brooks, K. Beard, Ji Li, Lorenzo Zana, J. P. Santoro, M. D. Mestayer, G. Ricco, Kalvir S. Dhuga, Michael L. Williams, M. Guidal, S. Boiarinov, A. I. Ostrovidov, E. Wolin, K. Wang, D. Branford, Dimitri Debruyne, C. Salgado, M. M. Ito, G. Gavalian, J. J. Manak, D. G. Ireland, R. C. Minehart, J. P. Ball, S. Stepanyan, M. Mirazita, J. M. Laget, Y. Prok, I. Hleiqawi, S. Simionatto, Volker D. Burkert, A. S. Biselli, G. E. Dodge, C. A. Meyer, D. Protopopescu, M. Holtrop, Bernhard Mecking, A.V. Stavinsky, K. S. Egiyan, P. Eugenio, M. Taiuti, Cynthia Marie Hadjidakis, C. Cetina, K. A. Griffioen, Michael Vineyard, L. Todor, W. Ingram, K. V. Dharmawardane, K. L. Giovanetti, B. Asavapibhop, Friedrich Klein, S. Pozdniakov, P. V. Degtyarenko, A. Tkabladze, Michael Dugger, Brian Raue, D. G. Crabb, M. Spraker, Larry Weinstein, William Bertozzi, E. Anciant, M. Guillo, D. J. Tedeschi, K. Mikhailov, D. P. Weygand, H. O. Funsten, E. De Sanctis, J. D. Kellie, A. Coleman, H. R. Weller, B. Carnahan, I. Niculescu, Sylvain Bouchigny, W. Kim, S. McAleer, G. Niculescu, M. Khandaker, R. J. Feuerbach, D. I. Sober, D. Lawrence, J. J. Melone, Daniel S. Carman, Alexei V. Klimenko, P. Rossi, G. Rosner, Laird Kramer, G. Audit, Thierry Auger, C. E. Hyde-Wright, Barry Ritchie, R. A. Schumacher, L. C. Smith, Susan Taylor, S. Strauch, H. Egiyan, Federico Ronchetti, C. I O Gordon, Kwangsoo Kim, G. Riccardi, J. Hu, G. S. Mutchler, G. Asryan, Nicola Bianchi, C. Butuceanu, S. McLauchlan, B. E. Stokes, G. S. Adams, K. Joo, L. Morand, T. A. Forest, K. Livingston, O. P. Dzyubak, R. A. Niyazov, C. S. Whisnant, B. L. Berman, N. Guler, U. Thoma, Avraham Klein, G. A. Peterson, A. V. Skabelin, M. Bektasoglu, L. M. Qin, F. W. Hersman, P. Corvisiero, P. L. Cole, S. Barrow, M. Nozar, Hall Crannell, M. Klusman, C. Marchand, N. Benmouna, M. Ripani, L. Guo, M. Ungaro, R. DeVita, P. Stoler, J. W C McNabb, J. Langheinrich, S. A. Philips, J. W. Price, S. O. Nelson, K. Hicks, R. W. Gothe, K. Y. Kim, J. Yun, D. Cords, A. Yegneswaran, G. V. O'Rielly, V. Gyurjyan, D. G. Jenkins, K. Sabourov, H. Bagdasaryan, B. B. Niczyporuk, N. Pivnyuk, J. Napolitano, S. A. Morrow, C. Djalali, P. Ambrozewicz, J. Lachniet, Jan Ryckebusch, D. Rowntree, R. S. Hakobyan, Patrick Girard, J. Shaw, Michael Wood, Baile Zhang, V. S. Serov, Shifeng Chen, M. Bellis, K. Park, E. Polli, Elton Smith, A. Empl, O. Pogorelko, M. Anghinolfi, K. Lukashin, L. C. Dennis, B. E. Bonner, James Mueller, H. Avakian, P. D. Rubin, J. P. Cummings, M. Kossov, Dinko Pocanic, W. J. Briscoe, E. Pasyuk, S. A. Dytman, Rakhsha Nasseripour, S. E. Kuhn, J. H. Kelley, C. Tur, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and CLAS
Subjects: Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, FOS: Physical sciences, Comparisons with model predictions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 4He, single spin azimuthal asymmetries vs missing momentum, 01 natural sciences, NUCLEON EMISSION, missing energy, Nuclear physics, 12C (polarised e, deduced, 0103 physical sciences, e′p), Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Spin-½, Physics, NUCLEAR REACTIONS, POLARIZED ELECTRONS, E'P REACTIONS, 010308 nuclear & particles physics, Scattering, POLARIZED ELECTRONS, NUCLEON EMISSION, E'P REACTIONS, KNOCKOUT, Helicity, Eikonal approximation, KNOCKOUT, 24.70.+s, 25.30.Dh, 27.10.+h, measured, final state interaction effects, High Energy Physics::Experiment, Nucleon, Glauber, Electron scattering, E=2.261, 4.461 GeV
Abstract: Single spin azimuthal asymmetries A_LT' were measured at Jefferson Lab using 2.2 and 4.4 GeV longitudinally polarized electrons incident on He4 and C12 targets in the CLAS detector. A_LT' is related to the imaginary part of the longitudinal-transverse interference and in quasifree nucleon knockout it provides an unambiguous signature for final state interactions (FSI). Experimental values of A_LT' were found to be below 5%, typically |A_LT'| < 3% for data with good statistical precision. Optical Model in Eikonal Approximation (OMEA) and Relativistic Multiple-Scattering Glauber Approximation (RMSGA) calculations are shown to be consistent with the measured asymmetries., 9 pages, 5 figures
Published: 2004
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