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21 results on '"O, Glamazdin"'

1. Deep Exclusive Electroproduction of π0 at High Q2 in the Quark Valence Regime

Author

N. H. Saylor, D. Bulumulla, Wouter Deconinck, E. Pooser, L. Ye, B. Crowe, Weidong Li, B. P. Quinn, Y. Huang, Douglas Higinbotham, E. Fuchey, C. Ayerbe Gayoso, Y. Zhao, S. A. Wood, M. K. Jones, Darko Androić, Jie Liu, A. J. Sarty, Z. Ye, K. Hamilton, E. McClellan, M. E. Christy, A. Liyanage, J. Bane, F. Georges, O. F. Obretch, C. Gal, S. F. Ali, Bogdan Wojtsekhowski, P. M. King, C. Palatchi, F. Hauenstein, J. Roche, T. Averett, P. E. Reimer, J. P. Chen, G. M. Urciuoli, Franco Meddi, M. H. Shabestari, C. Fanelli, K. A. Aniol, R. I. Pomatsalyuk, B. Aljawrneh, Shams Rahman, C. E. Hyde, R. Beminiwattha, X. Yan, Andrew Puckett, E. Voutier, E. Cisbani, S. J. Nazeer, Chunhui Chen, C. Desnault, M. Carmignotto, O. Glamazdin, J. Castellano, Z. Ahmed, L. Ou, F. De Persio, Olfred Hansen, S. Allison, J. R. M. Annand, Simon Širca, T. Gautam, D. Nguyen, B. Sawatzky, G. M. Huber, S. Danagoulian, J. C. Cornejo, Tanja Horn, C. M. Jen, F. Tortorici, T. Su, S. Alsalmi, Yicheng Wang, G. Hamad, B. Duran, Kalyan Allada, Maxime Defurne, R. Michaels, Hongjun Liu, D. Gaskell, Juliette Mammei, David Hamilton, Pete Markowitz, L. A. Thorne, E. J. Brash, V. M. Gray, C. Munoz Camacho, D. Adikaram, T. W. Danley, Y. Tian, K. Park, Ping Zhu, L. S. Myers, M. N. H. Rashad, Rolf Ent, R. A. Montgomery, D. Biswas, S. Malace, W. Henry, A. Sun, M. Dlamini, H. Atac, N. Israel, R. Trotta, X. Bai, V. Bellini, N. Ton, R. Spies, Alexandre Camsonne, A. Stefanko, C. Gu, K. Bartlett, K. Jin, B. A. Clary, Kondo Gnanvo, M. Nycz, T. Holmstrom, P.-J. Lin, Shanfeng Li, C. Yero, T. Hague, Taya Chetry, Jie Zhang, J. Bericic, J. Campbell, A. Mkrtchyan, Nikos Sparveris, K. Mesik, I. Sapkota, Vladimir Nelyubin, A. Shahinyan, N. Compton, D. Di, Eliahu Cohen, S. Sooriyaarachchilage, Cynthia Keppel, H. S. Ko, A. Kabir, V. A. Punjabi, D. G. Meekins, S. Barcus, V. Khachatryan, G. B. Franklin, P. Nadel-Turonski, N. Nuruzzaman, Chao Peng, G. R. Smith, H. F. Ibrahim, B. Karki, M. Duer, H. Albataineh, A. Subedi, S. Park, B. Schmookler, B. Pandey, Vincent Sulkosky, J. A. Magee, B. Waidyawansa, and S. Covrig Dusa

Subjects
Quark, Physics, Particle physics, 010308 nuclear & particles physics, Momentum transfer, General Physics and Astronomy, Sigma, Virtual particle, Parton, 01 natural sciences, Helicity, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of $x_B$ (0.36, 0.48 and 0.60) and $Q^2$ (3.1 to 8.4 GeV$^2$) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions $d\sigma_L/dt+\epsilon d\sigma_T/dt$, $d\sigma_{TT}/dt$, $d\sigma_{LT}/dt$ and $d\sigma_{LT'}/dt$ are extracted as a function of the proton momentum transfer $t-t_{min}$. The results suggest the amplitude for transversely polarized virtual photons continues to dominate the cross-section throughout this kinematic range. The data are well described by calculations based on transversity Generalized Parton Distributions coupled to a helicity flip Distribution Amplitude of the pion, thus providing a unique way to probe the structure of the nucleon.

Published
2021
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2. A small proton charge radius from an electron–proton scattering experiment

Author

D. Bhetuwal, C. Peng, M. L. Kabir, L. Ye, Z. Ye, B. Aljawrneh, James Maxwell, L. Gan, N. Ton, B. Emmich, R.S. Pedroni, H. Bhatt, S. J. Nazeer, J. Brock, Haiyan Gao, A. Karki, W. Xiong, Ashot Gasparian, X. Yan, C. D. Keith, O. Glamazdin, S. Kowalski, V. V. Tarasov, E. Pasyuk, Z. W. Zhao, S. Stepanyan, K. P. Adhikari, Douglas Higinbotham, J. Pierce, M. Levillain, P. Ekanayaka, Vladimir Nelyubin, C. F. Perdrisat, D. G. Meekins, C. Carlin, Volker D. Burkert, Nilanga Liyanage, L. El-Fassi, R. Silwal, Dipangkar Dutta, A. Liyanage, A. Shahinyan, I. Larin, A. Subedi, V. Lagerquist, Kondo Gnanvo, Yuelin Zhang, M. H. Shabestari, M. Meziane, A. Deur, J. A. Dunne, V. A. Punjabi, D. Di, M. Khandaker, X. Bai, Tiehui Liu, C. Gu, and H. Nguyen

Subjects
Physics, Multidisciplinary, Proton, 010308 nuclear & particles physics, Scattering, Radius, Hydrogen atom, Electron, 01 natural sciences, Nuclear physics, symbols.namesake, Charge radius, 0103 physical sciences, Rydberg formula, symbols, 010306 general physics, Exotic atom
Abstract

Elastic electron–proton scattering (e–p) and the spectroscopy of hydrogen atoms are the two methods traditionally used to determine the proton charge radius, rp. In 2010, a new method using muonic hydrogen atoms1 found a substantial discrepancy compared with previous results2, which became known as the ‘proton radius puzzle’. Despite experimental and theoretical efforts, the puzzle remains unresolved. In fact, there is a discrepancy between the two most recent spectroscopic measurements conducted on ordinary hydrogen3,4. Here we report on the proton charge radius experiment at Jefferson Laboratory (PRad), a high-precision e–p experiment that was established after the discrepancy was identified. We used a magnetic-spectrometer-free method along with a windowless hydrogen gas target, which overcame several limitations of previous e–p experiments and enabled measurements at very small forward-scattering angles. Our result, rp = 0.831 ± 0.007stat ± 0.012syst femtometres, is smaller than the most recent high-precision e–p measurement5 and 2.7 standard deviations smaller than the average of all e–p experimental results6. The smaller rp we have now measured supports the value found by two previous muonic hydrogen experiments1,7. In addition, our finding agrees with the revised value (announced in 2019) for the Rydberg constant8—one of the most accurately evaluated fundamental constants in physics. A magnetic-spectrometer-free method for electron–proton scattering data reveals a proton charge radius 2.7 standard deviations smaller than the currently accepted value from electron–proton scattering, yet consistent with other recent experiments.

Published
2019
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3. Deeply virtual Compton scattering off the neutron

Author

M. Benali, C. Desnault, M. Mazouz, Z. Ahmed, H. Albataineh, K. Allada, K. A. Aniol, V. Bellini, W. Boeglin, P. Bertin, M. Brossard, A. Camsonne, M. Canan, S. Chandavar, C. Chen, J.-P. Chen, M. Defurne, C. W. de Jager, R. de Leo, A. Deur, L. El Fassi, R. Ent, D. Flay, M. Friend, E. Fuchey, S. Frullani, F. Garibaldi, D. Gaskell, A. Giusa, O. Glamazdin, S. Golge, J. Gomez, O. Hansen, D. Higinbotham, T. Holmstrom, T. Horn, J. Huang, M. Huang, G. M. Huber, C. E. Hyde, S. Iqbal, F. Itard, Ho. Kang, Hy. Kang, A. Kelleher, C. Keppel, S. Koirala, I. Korover, J. J. LeRose, R. Lindgren, E. Long, M. Magne, J. Mammei, D. J. Margaziotis, P. Markowitz, A. Martí Jiménez-Argüello, F. Meddi, D. Meekins, R. Michaels, M. Mihovilovic, N. Muangma, C. Muñoz Camacho, P. Nadel-Turonski, N. Nuruzzaman, R. Paremuzyan, R. Pomatsalyuk, A. Puckett, V. Punjabi, Y. Qiang, A. Rakhman, M. N. H. Rashad, S. Riordan, J. Roche, G. Russo, F. Sabatié, K. Saenboonruang, A. Saha, B. Sawatzky, L. Selvy, A. Shahinyan, S. Sirca, P. Solvignon, M. L. Sperduto, R. Subedi, V. Sulkosky, C. Sutera, W. A. Tobias, G. M. Urciuoli, D. Wang, B. Wojtsekhowski, H. Yao, Z. Ye, L. Zana, X. Zhan, J. Zhang, B. Zhao, Z. Zhao, X. Zheng, P. Zhu, Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
quark: flavor, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, n: structure function, nucleon, FOS: Physical sciences, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High Energy Physics - Experiment, 010305 fluids & plasmas, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), deeply virtual Compton scattering, 0103 physical sciences, photon: scattering, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

The three-dimensional structure of nucleons (protons and neutrons) is embedded in so-called generalized parton distributions, which are accessible from deeply virtual Compton scattering. In this process, a high energy electron is scattered off a nucleon by exchanging a virtual photon. Then, a highly-energetic real photon is emitted from one of the quarks inside the nucleon, which carries information on the quark's transverse position and longitudinal momentum. By measuring the cross-section of deeply virtual Compton scattering, Compton form factors related to the generalized parton distributions can be extracted. Here, we report the observation of unpolarized deeply virtual Compton scattering off a deuterium target. From the measured photon-electroproduction cross-sections, we have extracted the cross-section of a quasi-free neutron and a coherent deuteron. Due to the approximate isospin symmetry of quantum chromodynamics, we can determine the contributions from the different quark flavours to the helicity-conserved Compton form factors by combining our measurements with previous ones probing the proton's internal structure. These results advance our understanding of the description of the nucleon structure, which is important to solve the proton spin puzzle.

Published
2020
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4. Measurement of double-polarization asymmetries in the quasi-elastic Process

Author

R. A. Lindgren, C. Dutta, William A. Tobias, X. Zhan, F. Garibaldi, M. H. Shabestari, G. D. Cates, D. Flay, B. Schoenrock, Henryk Witała, Y. Zhang, X. Deng, Diana Parno, T. Holmstrom, J. P. Chen, B. Zhao, P. Monaghan, Yingxiao Wang, J. Huang, P. M. King, A. Saha, G. M. Urciuoli, Bogdan Wojtsekhowski, N. Muangma, J. Gomez, Shalev Gilad, S. Golge, R. Subedi, C. W. de Jager, T. Averett, Chunhui Chen, S. Širca, A. Shahinyan, P. C. Bradshaw, X. Jiang, Xin Qian, A. Kievsky, J. St. John, P. U. Sauer, H. P. Khanal, B. Moffit, Mustafa Canan, Kalyan Allada, R. Michaels, R. Skibiński, L. El Fassi, W. U. Boeglin, A. Deltuva, A. Deur, H. Kang, B. D. Anderson, Yiyang Zhang, W. Tireman, M. Meziane, M. Posik, William Bertozzi, Z. Ye, H.-J. Lu, Wolfgang Korsch, B. E. Norum, Michele Viviani, Hiroyuki Kamada, Vincent Sulkosky, O. Glamazdin, Pete Markowitz, Olfred Hansen, J. R. M. Annand, A. Camsonne, H. F. Ibrahim, J. LeRose, W. Luo, R. De Leo, Joseph M. Katich, Kacper Topolnicki, J. W. Watson, B. Sawatzky, E. Chudakov, Haiyan Gao, L. E. Marcucci, S. Riordan, V. A. Punjabi, D. Wang, Ronald Gilman, Douglas Higinbotham, M. K. Jones, E. Jensen, Jacek Golak, K. Pan, K. Wang, X. Qui, L. Y. Zhu, S. Frullani, G. Jin, X. Zheng, S. K. Nanda, Yujie Qiang, Andrew Puckett, Rocco Schiavilla, E. Long, M. Mihovilovič, and E. Piasetzky

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Observable, Kinematics, Spin structure, Polarization (waves), Breakup, 01 natural sciences, p-process, Nuclear interaction, Nuclear physics, Reaction dynamics, 0103 physical sciences, Nuclear Experiment, 010306 general physics
Abstract

We report on a precise measurement of double-polarization asymmetries in electron-induced breakup of He3 proceeding to pd and ppn final states, performed in quasi-elastic kinematics at Q2=0.25(GeV/c)2 for missing momenta up to 250MeV/c. These observables represent highly sensitive tools to investigate the electromagnetic and spin structure of He3 and the relative importance of two- and three-body effects involved in the breakup reaction dynamics. The measured asymmetries cannot be satisfactorily reproduced by state-of-the-art calculations of He3 unless their three-body segment is adjusted, indicating that the spin-dependent part of the nuclear interaction governing the three-body breakup process is much smaller than previously thought.

Published
2018

5. Photoproduction of K+K− meson pairs on the proton

Author

G. Ricco, R. A. Schumacher, K. Mikhailov, L. Bibrzycki, P. Stoler, A. D'Angelo, K. Hicks, H. Hakobyan, Ashot Gasparian, L. Gan, V. Mokeev, A.V. Stavinsky, K. Livingston, D. S. Dale, S. Anefalos Pereira, A. V. Vlassov, D. J. Tedeschi, V. V. Mochalov, K. A. Griffioen, S. Fegan, E. Clinton, Michael Wood, N. Hassall, M. Bellis, K. Hafidi, Michael Vineyard, R. De Vita, S. Stepanyan, C. Bookwalter, P. Nadel-Turonski, M. Kossov, Avraham Klein, T. Mineeva, V. Drozdov, S. Strauch, V. Kuznetsov, Friedrich Klein, D. P. Watts, E. L. Isupov, E. Munevar, H. Egiyan, I. Nakagawa, I. Bedlinskiy, Brian Raue, W. J. Briscoe, Michael L. Williams, A. Kubarovsky, W. Gohn, E. Wolin, Lorenzo Zana, M. Y. Gabrielyan, C. E. Hyde, O. Glamazdin, M. R. Niroula, Z. W. Zhao, S. Niccolai, Y. Prok, D. S. Carman, M. Battaglieri, Barry Ritchie, N. Pivnyuk, I. I. Strakovsky, D. Protopopescu, C. Salgado, E. De Sanctis, M. Garçon, S. Pozdniakov, A. Deur, G. E. Dodge, Martin K. Mayer, G. Rosner, H. Y. Lu, Kei Moriya, C. A. Meyer, M. Osipenko, N. Dashyan, D. I. Sober, F. X. Girod, E. Pasyuk, G. V. Fedotov, S. Tkachenko, Adam P. Szczepaniak, M. S. Saini, I. Niculescu, P. Eugenio, H. Baghdasaryan, K. P. Adhikari, D. P. Weygand, E. Golovatch, M. Taiuti, J. T. Goetz, D. Schott, J. W. Price, C. Djalali, F. Sabatié, V. P. Kubarovsky, O. Pogorelko, W. Kim, P. Collins, M. Anghinolfi, Leonard Lesniak, H. Seraydaryan, J. Zhang, P. Khetarpal, Y. G. Sharabian, C. S. Nepali, M. Ripani, V. Crede, C. Hanretty, J. R. Johnstone, L. Guo, M. Ungaro, S. Park, P. Rossi, K. Joo, M. Guidal, M. Holtrop, A. Daniel, A. I. Ostrovidov, K. Park, Sergey Kuleshov, D. G. Ireland, S. S. Stepanyan, Mark W. Paris, B. Zhao, Volker D. Burkert, A. S. Biselli, S. Dhamija, R. W. Gothe, A. Fradi, M. J. Amaryan, J. Goett, B. McKinnon, D. Branford, S. Pisano, M. Mirazita, S. L. Careccia, J. M. Laget, K. L. Giovanetti, Larry Weinstein, D. Keller, Gerard Gilfoyle, M. Khandaker, M. E. McCracken, Y. Ilieva, D. Sokhan, D. Doughty, A. Teymurazyan, and P. L. Cole

Subjects
Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, Elementary particle, 01 natural sciences, 7. Clean energy, Particle decay, Pion, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The exclusive reaction $\ensuremath{\gamma}p\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ was studied in the photon energy range 3.0--3.8 GeV and the momentum transfer range $0.4l\ensuremath{-}tl1.0\text{ }\text{ }{\mathrm{GeV}}^{2}$. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. In this kinematic range, the integrated luminosity was about $20\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. The reaction was isolated by detecting the ${\ensuremath{\pi}}^{+}$ and proton in CLAS, and reconstructing the ${\ensuremath{\pi}}^{\ensuremath{-}}$ via the missing-mass technique. Moments of the di-pion decay angular distributions were derived from the experimental data. Differential cross sections for the $S$, $P$, and $D$-waves, in the ${M}_{{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}}$ mass range 0.4--1.4 GeV, were derived performing a partial wave expansion of the extracted moments. Beside the dominant contribution of the $\ensuremath{\rho}(770)$ meson in the $P$-wave, evidence for the ${f}_{0}(980)$ and the ${f}_{2}(1270)$ mesons was found in the $S$ and $D$-waves, respectively. The differential production cross sections $d\ensuremath{\sigma}/dt$ for individual waves in the mass range of the above-mentioned mesons were extracted. This is the first time the ${f}_{0}(980)$ has been measured in a photoproduction experiment.

Published
2018
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6. Rosenbluth Separation of the π0 Electroproduction Cross Section Off the Neutron

Author

N. Nuruzzaman, S. Golge, M. L. Sperduto, Bogdan Wojtsekhowski, R. A. Lindgren, J. J. LeRose, C. M. Sutera, Chunhui Chen, Z. W. Zhao, Z. Ye, M. Mihovilovic, H. Albataineh, H. Yao, D. Flay, N. Muangma, V. Bellini, A. Martí Jiménez-Argüello, Yujie Qiang, A. Saha, M. Huang, Andrew Puckett, D. G. Meekins, Z. Ahmed, B. Zhao, F. Sabatié, Simon Širca, G. M. Huber, Pete Markowitz, S. Koirala, F. Garibaldi, L. El Fassi, W. U. Boeglin, C. E. Hyde, Tanja Horn, X. Zhan, D. J. Margaziotis, M. Brossard, S. Chandavar, Maxime Defurne, R. De Leo, D. Gaskell, M. Benali, C. W. de Jager, K. A. Aniol, M. Mazouz, P. Solvignon, O. Glamazdin, M. Magne, Olfred Hansen, A. Deur, Cynthia Keppel, A. Camsonne, Douglas Higinbotham, M. N. H. Rashad, A. Shahinyan, Vincent Sulkosky, V. A. Punjabi, Mustafa Canan, C. Desnault, Kalyan Allada, E. Long, J. Roche, S. Iqbal, William A. Tobias, E. Fuchey, I. Korover, A. Giusa, Abdurahim Rakhman, A. Kelleher, G.V. Russo, Ho. Kang, J. P. Chen, X. Zheng, L. Selvy, D. Wang, Juliette Mammei, L. Zana, J. Huang, G. M. Urciuoli, J. Gomez, Rolf Ent, S. Riordan, P.Y. Bertin, P. Nadel-Turonski, P. Zhu, H. Kang, Franco Meddi, M. Friend, Jie Zhang, S. Frullani, R. Paremuzyan, Kiadtisak Saenboonruang, R. Subedi, B. Sawatzky, F. Itard, T. Holmstrom, R. Michaels, and C. Munoz Camacho

Subjects
Quark, Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, Momentum transfer, General Physics and Astronomy, Parton, 01 natural sciences, 7. Clean energy, Nuclear physics, Recoil, 0103 physical sciences, Photon polarization, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

We report the first longitudinal-transverse separation of the deeply virtual exclusive π^{0} electroproduction cross section off the neutron and coherent deuteron. The corresponding four structure functions dσ_{L}/dt, dσ_{T}/dt, dσ_{LT}/dt, and dσ_{TT}/dt are extracted as a function of the momentum transfer to the recoil system at Q^{2}=1.75 GeV^{2} and x_{B}=0.36. The ed→edπ^{0} cross sections are found compatible with the small values expected from theoretical models. The en→enπ^{0} cross sections show a dominance from the response to transversely polarized photons, and are in good agreement with calculations based on the transversity generalized parton distributions of the nucleon. By combining these results with previous measurements of π^{0} electroproduction off the proton, we present a flavor decomposition of the u and d quark contributions to the cross section.

Published
2017
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7. Extraction of the Neutron Electric Form Factor from Measurements of Inclusive Double Spin Asymmetries

Author

G. D. Cates, T. Holmstrom, Xin Qian, Haiyan Gao, M. Meziane, Simon Širca, F. Garibaldi, H. F. Ibrahim, E. Chudakov, Houbing Lu, P. M. King, A. Shahinyan, W.U. Boeglin, V. A. Punjabi, D. G. Meekins, X. Jiang, E. Long, C. Dutta, William A. Tobias, Bogdan Wojtsekhowski, L. El Fassi, Vincent Sulkosky, S. Riordan, H. P. Khanal, A. Kelleher, H. Kang, A. Camsonne, R. A. Lindgren, Eric L. N. Jensen, N. Muangma, W. Tireman, Diana Parno, M. Mihovilovic, R. Subedi, D. Flay, Yingxiao Wang, W. Luo, M. H. Shabestari, B. Shoenrock, B. Sawatzky, Shalev Gilad, C. W. de Jager, Bryan J. Moffit, E. Piasetzky, X. Zhan, A. Deur, J.-O. Hansen, Z. Ye, B. E. Norum, Y. Zhang, M. Posik, R. Michaels, X. Deng, B. Zhao, J. Gomez, X. Qui, S. Golge, Arijit Saha, P. Monaghan, P. C. Bradshaw, Chunhui Chen, A. J. R. Puckett, L. Y. Zhu, Wolfgang Korsch, J. W. Watson, O. Glamazdin, J. R. M. Annand, S. Frullani, J. P. Chen, J. Huang, G. M. Urciuoli, William Bertozzi, Ronald Gilman, Pete Markowitz, J. LeRose, R. De Leo, J. John, Brian P. Anderson, Yiyang Zhang, Joseph M. Katich, Douglas Higinbotham, Matthew Jones, K. Pan, K. Wang, D. Wang, T. Averett, G. Jin, X. Zheng, Mustafa Canan, Kalyan Allada, S. K. Nanda, and Yujie Qiang

Subjects
Physics, Particle physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Nuclear Theory, Electric form factor, Form factor (quantum field theory), FOS: Physical sciences, 01 natural sciences, Asymmetry, Nuclear physics, Pion, 0103 physical sciences, Neutron detection, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Spin-½, media_common
Abstract

$[Background]$ Measurements of the neutron charge form factor, $G^n_E$, are challenging due to the fact that the neutron has no net charge. In addition, measurements of the neutron form factors must use nuclear targets which require accurately accounting for nuclear effects. Extracting $G^n_E$ with different targets and techniques provides an important test of our handling of these effects. $[Purpose]$ The goal of the measurement was to use an inclusive asymmetry measurement technique to extract the neutron charge form factor at a four-momentum transfer of $1~(\rm{GeV/c})^2$. This technique has very different systematic uncertainties than traditional exclusive measurements and thus serves as an independent check of whether nuclear effects have been taken into account correctly. $[Method]$ The inclusive quasi-elastic reaction $^3\overrightarrow{\rm{He}}(\overrightarrow{e},e')$ was measured at Jefferson Lab. The neutron electric form factor, $G_E^n$, was extracted at $Q^2 = 0.98~(\rm{GeV/c})^2$ from ratios of electron-polarization asymmetries measured for two orthogonal target spin orientations. This $Q^2$ is high enough that the sensitivity to $G_E^n$ is not overwhelmed by the neutron magnetic contribution, and yet low enough that explicit neutron detection is not required to suppress pion production. $[Results]$ The neutron electric form factor, $G_E^n$, was determined to be $0.0414\pm0.0077\;{(stat)}\pm0.0022\;{(syst)}$; providing the first high precision inclusive extraction of the neutron's charge form factor. $[Conclusions]$ The use of the inclusive quasi-elastic $^3\overrightarrow{\rm{He}}(\overrightarrow{e},e')$ with a four-momentum transfer near $1~(\rm{GeV/c})^2$ has been used to provide a unique measurement of $G^n_E$. This new result provides a systematically independent validation of the exclusive extraction technique results., 7 pages, 2 figures, 2 tables

Published
2017

8. First measurement of unpolarized semi-inclusive deep-inelastic scattering cross sections from a He3 target

Author

Nilanga Liyanage, D. J. Margaziotis, T. Liu, G. D. Cates, X. Zhan, Young Do Oh, Y. Li, E. Cisbani, P. C. Bradshaw, D. McNulty, Arijit Saha, C. Dutta, J. C. Cornejo, A. Kolarkar, Simon Širca, Chunhui Chen, R. A. Lindgren, J. J. LeRose, F. Garibaldi, A. Shahinyan, P. A. M. Dolph, F. Cusanno, William A. Tobias, L. G. Tang, Abdurahim Rakhman, X. Yan, Y. Zhang, W. Kim, V. Sulkosky, A. Deur, M. Huang, Ronald Ransome, H. Ding, H. F. Ibrahim, H. Yao, R. Michaels, Mustafa Canan, Xin Qian, S. K. Phillips, Kalyan Allada, William Bertozzi, Yanxi Zhang, Bogdan Wojtsekhowski, T. Averett, X. Jiang, C. Munoz Camacho, B. Zhao, L. Guo, E. Long, M. M. Dalton, Wouter Deconinck, M. Posik, L. El Fassi, S. Riordan, Wolfgang Korsch, P. E. Bosted, Haiyan Gao, Zein-Eddine Meziani, Ronald Gilman, David Hamilton, M. H. Shabestari, Pete Markowitz, Y. F. Wang, E. Chudakov, S. Frullani, X. Zong, A. Kelleher, M. Osipenko, I. Vilardi, Xiaofeng Zhu, Dipanwita Dutta, X. Deng, B. Sawatzky, Jen-Chieh Peng, G. Jin, A. J. R. Puckett, B. Moffit, Y. X. Ye, Houbing Lu, X. Zheng, S. Stepanyan, W. Chen, Fatiha Benmokhtar, R. De Leo, T. Holmstrom, L. Yuan, Vladimir Nelyubin, R. Subedi, Shalev Gilad, Diana Parno, K. Chirapatpimol, J. P. Chen, C. W. de Jager, O. Glamazdin, E. Schulte, K. A. Aniol, Olfred Hansen, J. R. M. Annand, S. K. Nanda, Yujie Qiang, S. Golge, L. Y. Zhu, J. Huang, G. M. Urciuoli, Alexandre Camsonne, Z. Ye, B. E. Norum, Y. Zhao, X. Li, Mauro Iodice, Douglas Higinbotham, M. K. Jones, K. Wang, S. Marrone, Amrendra Narayan, Joseph M. Katich, and D. Gaskell

Subjects
Quark, Quantum chromodynamics, Physics, Particle physics, 010308 nuclear & particles physics, Scattering, Quark model, Deep inelastic scattering, 01 natural sciences, Nuclear physics, 0103 physical sciences, Neutron, Nuclear cross section, 010306 general physics, Nucleon
Abstract

The unpolarized semi-inclusive deep-inelastic scattering (SIDIS) differential cross sections in He3(e,e′π±)X have been measured for the first time in Jefferson Lab experiment E06-010 with a 5.9GeVe− beam on a He3 gas target. The experiment focuses on the valence quark region, covering a kinematic range 0.12

Published
2017
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9. Measurement of the single-spin asymmetry Ay0 in quasi-elastic 3He↑(e,e′n) scattering at 0.4 < Q2 < 1.0 GeV/c2

Author

E. Long, O. Glamazdin, J. R. M. Annand, J. P. Chen, S. K. Nanda, Yujie Qiang, A. Kelleher, J. Huang, M. Mihovilovič, A. Deur, T. Holmstrom, F. Garibaldi, Z. Ye, B. E. Norum, William Bertozzi, Pete Markowitz, M. H. Shabestari, L. Y. Zhu, J. Gomez, X. Jiang, B. Zhao, R. De Leo, X. Deng, S. Riordan, P. Monaghan, A. Shahinyan, Y. Zhang, T. Averett, Xin Qian, G. Jin, Chunhui Chen, S. Širca, J. St. John, M. Meziane, A. Camsonne, B. D. Anderson, X. Zheng, B. Moffit, H. F. Ibrahim, B. Sawatzky, H.-J. Lu, B. Shoenrock, S. Golge, L. El Fassi, W. U. Boeglin, Wolfgang Korsch, P. M. King, Vincent Sulkosky, E. Chudakov, R. Subedi, C. Dutta, William A. Tobias, J. O. Hansen, V. A. Punjabi, Bogdan Wojtsekhowski, J. W. Watson, X. Qui, N. Muangma, R. Michaels, H. P. Khanal, W. Tireman, G. D. Cates, X. Zhan, Yingxiao Wang, H. Kang, S. Frullani, G. M. Urciuoli, M. Posik, Shalev Gilad, R. A. Lindgren, J. J. LeRose, C. W. de Jager, W. Luo, Diana Parno, A. J. R. Puckett, D. Flay, Haiyan Gao, D. Wang, E. Piasetzky, Ronald Gilman, Mustafa Canan, Kalyan Allada, Yiyang Zhang, Joseph M. Katich, Douglas Higinbotham, A. Saha, M. K. Jones, P. C. Bradshaw, E. Jensen, K. Pan, and K. Wang

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, Plane wave, Electron, 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Electron scattering, media_common
Abstract

Due to the lack of free neutron targets, studies of the structure of the neutron are typically made by scattering electrons from either 2H or 3He targets. In order to extract useful neutron information from a 3He target, one must understand how the neutron in a 3He system differs from a free neutron by taking into account nuclear effects such as final state interactions and meson exchange currents. The target single spin asymmetry A y 0 is an ideal probe of such effects, as any deviation from zero indicates effects beyond plane wave impulse approximation. New measurements of the target single spin asymmetry A y 0 at Q 2 of 0.46 and 0.96 (GeV/ c ) 2 were made at Jefferson Lab using the quasi-elastic He ↑ 3 ( e , e ′ n ) reaction. Our measured asymmetry decreases rapidly, from > 20 % at Q 2 = 0.46 (GeV/ c ) 2 to nearly zero at Q 2 = 0.96 (GeV / c ) 2 , demonstrating the fall-off of the reaction mechanism effects as Q 2 increases. We also observed a small ϵ-dependent increase in A y 0 compared to previous measurements, particularly at moderate Q 2 . This indicates that upcoming high Q 2 measurements from the Jefferson Lab 12 GeV program can cleanly probe neutron structure from polarized 3He using plane wave impulse approximation.

Published
2019
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10. A glimpse of gluons through deeply virtual compton scattering on the proton

Author

J. Huang, S. Riordan, M. Brossard, I. Korover, N. Nuruzzaman, S. Golge, H. Al-Bataineh, P. Bertin, William A. Tobias, Abdurahim Rakhman, H. Kang, H. Yao, A. Camsonne, Franco Meddi, Yujie Qiang, M. Huang, A. Kelleher, A. Martí Jiménez-Argüello, S. Koirala, Kiadtisak Saenboonruang, D. J. Margaziotis, Andrew Puckett, T. Horn, E. Fuchey, G.V. Russo, R. Ent, Z. W. Zhao, Z. Ye, S. Chandavar, J. LeRose, R. De Leo, O. Glamazdin, Olfred Hansen, E. Long, F. Garibaldi, V. Bellini, L. Selvy, Bogdan Wojtsekhowski, M. N. H. Rashad, R. A. Lindgren, Cynthia Keppel, P. Markowitz, Jian-Ping Chen, X. Zhan, M. Mihovilovic, Juliette Mammei, Arijit Saha, J. Gomez, V. A. Punjabi, S. Frullani, P. Nadel-Turonski, Alexandre Deur, K. A. Aniol, Chunhui Chen, S. Širca, D. Wang, F. Sabatié, X. Zheng, R. Paremuzyan, Ping Zhu, Mustafa Canan, Kalyan Allada, R. Michaels, D. G. Meekins, C. M. Sutera, M. L. Sperduto, M. Magne, Charles Hyde, B. Zhao, D. Flay, P. Solvignon, L. El Fassi, W. U. Boeglin, M. Defurne, M. Mazouz, Jie Zhang, B. Sawatzky, M. Benali, C. Desnault, Vincent Sulkosky, S. Iqbal, F. Itard, J. Roche, M. Friend, T. Holmstrom, D. Gaskell, Douglas Higinbotham, A. Giusa, A. Shahinyan, C. W. de Jager, C. Muñoz Camacho, Z. Ahmed, G. M. Urciuoli, R. Subedi, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), 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), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, 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 ), Laboratoire de Physique de Clermont ( LPC ), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Clermont Auvergne ( UCA ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Genetics and Molecular Biology (all), Photon, Proton, High Energy Physics::Lattice, Nuclear Theory, General Physics and Astronomy, Virtual particle, parton: distribution function, Biochemistry, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], p: structure function, Nuclear Experiment (nucl-ex), [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], lcsh:Science, Nuclear Experiment, Physics, energy: high, Multidisciplinary, strong interaction, Chemistry (all), Compton scattering: form factor, photon: energy spectrum, High Energy Physics - Phenomenology, confinement, +electron+p+photon%22">electron p --> electron p photon, channel cross section: measured, Quark, electron p: deep inelastic scattering, Particle physics, electron: polarized beam, Science, Strong interaction, FOS: Physical sciences, Bethe-Heitler, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Article, General Biochemistry, Genetics and Molecular Biology, energy dependence, quark, Physics and Astronomy (all), [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], photon: emission, deeply virtual Compton scattering, 0103 physical sciences, structure, 010306 general physics, quantum mechanics: interference, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Compton scattering, General Chemistry, gluon, sensitivity, Gluon, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Quark–gluon plasma, lcsh:Q, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, holography, Biochemistry, Genetics and Molecular Biology (all), photon: virtual, experimental results
Abstract

The internal structure of nucleons (protons and neutrons) remains one of the greatest outstanding problems in modern nuclear physics. By scattering high-energy electrons off a proton we are able to resolve its fundamental constituents and probe their momenta and positions. Here we investigate the dynamics of quarks and gluons inside nucleons using deeply virtual Compton scattering (DVCS)—a highly virtual photon scatters off the proton, which subsequently radiates a photon. DVCS interferes with the Bethe-Heitler (BH) process, where the photon is emitted by the electron rather than the proton. We report herein the full determination of the BH-DVCS interference by exploiting the distinct energy dependences of the DVCS and BH amplitudes. In the regime where the scattering is expected to occur off a single quark, measurements show an intriguing sensitivity to gluons, the carriers of the strong interaction., It remains a challenge to find the structure and the distribution of the constituents of nucleons. Here the authors use a scattering method to get information about the gluons and quarks inside a proton and separate the contribution of Bethe-Heitler from the deeply virtual Compton scattering process.

Published
2017
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11. Measurements ofd2nandA1n: Probing the neutron spin structure

Author

T. Averett, C. E. Hyde, A. Saha, R. Subedi, Nilanga Liyanage, R. A. Lindgren, J. J. LeRose, V. Sulkosky, S. K. Nanda, Yujie Qiang, D. Flay, S. Riordan, Fatiha Benmokhtar, Simon Širca, M. H. Shabestari, F. Garibaldi, Bogdan Wojtsekhowski, H. Yao, Wolfgang Korsch, Young Do Oh, V. Mamyan, G. D. Cates, A. Kolarkar, R. Michaels, M. M. Dalton, Douglas Higinbotham, Whitney Armstrong, X. Deng, C. Dutta, H. F. Ibrahim, N. Muangma, William A. Tobias, M. Friend, W. Troth, E. Chudakov, Diana Parno, M. Mihovilovic, D. McNulty, Haiyan Gao, X. Zhan, G. J. Kumbartzki, G. Jin, J. P. Chen, J. Gomez, B. Sawatzky, M. Posik, X. Zheng, X. Jiang, Chunhui Chen, X. Yan, Ronald Ransome, Wouter Deconinck, G. B. Franklin, B. Zhao, L. Guo, Z. Ye, B. E. Norum, T. Holmstrom, Xin Qian, A. Shahinyan, E. Long, Y. Zhang, S. Choi, Jen-Chieh Peng, A. Kelleher, J. Huang, A. Lukhanin, Yingxiao Wang, L. El Fassi, Mustafa Canan, Kalyan Allada, Vladimir Nelyubin, Shalev Gilad, L. Yuan, C. W. de Jager, Bryan J. Moffit, S. Golge, Abdurahim Rakhman, Z. E. Meziani, F. Cusanno, P. Solvignon, A. Deur, Yiyang Zhang, Y. X. Ye, William Bertozzi, Amrendra Narayan, Joseph M. Katich, D. Wang, Ronald Gilman, O. Glamazdin, Olfred Hansen, Alexandre Camsonne, and Nuruzzaman

Subjects
Quark, Physics, Quantum chromodynamics, QCD sum rules, Particle physics, 010308 nuclear & particles physics, Constituent quark, Lattice QCD, Deep inelastic scattering, 01 natural sciences, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Atomic physics, 010306 general physics, Electron scattering
Abstract

We report on the results of the E06-014 experiment performed at Jefferson Lab in Hall A, where a precision measurement of the twist-3 matrix element d_2 of the neutron (d^n_2) was conducted. The quantity dn_2 represents the average color Lorentz force a struck quark experiences in a deep inelastic electron scattering event off a neutron due to its interaction with the hadronizing remnants. This color force was determined from a linear combination of the third moments of the ^3He spin structure functions, g_1 and g_2, after nuclear corrections had been applied to these moments. The structure functions were obtained from a measurement of the unpolarized cross section and of double-spin asymmetries in the scattering of a longitudinally polarized electron beam from a transversely and a longitudinally polarized ^3He target. The measurement kinematics included two average Q^2 bins of 3.2 GeV^2 and 4.3 GeV^2, and Bjorken-x 0.25≤ x ≤0.90 covering the deep inelastic and resonance regions. We have found that d^n_2 is small and negative for ⟨Q^2⟩=3.2 GeV^2, and even smaller for ⟨Q^2⟩=4.3 GeV^2, consistent with the results of a lattice QCD calculation. The twist-4 matrix element f^n_2 was extracted by combining our measured d^n_2 with the world data on the first moment in x of g^n_1, Γ^n_1. We found f^n_2 to be roughly an order of magnitude larger than dn2. Utilizing the extracted d^n_2 and f^n_2 data, we separated the Lorentz color force into its electric and magnetic components, F^(y,n)_E and F^(y,n)_B, and found them to be equal and opposite in magnitude, in agreement with the predictions from an instanton model but not with those from QCD sum rules. Furthermore, using the measured double-spin asymmetries, we have extracted the virtual photon-nucleon asymmetry on the neutron A^n_1, the structure function ratio g^n_1/F^n_1, and the quark ratios (Δu+Δu)/(u+u) and (Δd+Δd)/(d+d). These results were found to be consistent with deep-inelastic scattering world data and with the prediction of the constituent quark model but at odds with the perturbative quantum chromodynamics predictions at large x.

Published
2016
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12. Rosenbluth Separation of the π^{0} Electroproduction Cross Section

Author

M. Brossard, E. Long, William A. Tobias, A. Kelleher, A. Saha, D. J. Margaziotis, Pete Markowitz, Bogdan Wojtsekhowski, D. G. Meekins, R. Subedi, O. Glamazdin, Chunhui Chen, S. Chandavar, C. M. Sutera, F. Sabatié, R. De Leo, Olfred Hansen, Maxime Defurne, J. P. Chen, Kiadtisak Saenboonruang, L. El Fassi, W. U. Boeglin, N. Nuruzzaman, B. Sawatzky, Abdurahim Rakhman, S. Golge, M. Magne, M. N. H. Rashad, J. Huang, G. M. Urciuoli, M. Friend, S. Koirala, A. Martí Jiménez-Argüello, S. Riordan, C. W. de Jager, K. A. Aniol, P. Nadel-Turonski, Yujie Qiang, H. Yao, R. A. Lindgren, J. J. LeRose, Andrew Puckett, A. Deur, C. E. Hyde, I. Korover, R. Michaels, Cynthia Keppel, X. Zhan, Z. W. Zhao, Z. Ye, E. Fuchey, Jie Zhang, V. A. Punjabi, P.Y. Bertin, C. Desnault, H. Albataineh, P. Zhu, M. Mazouz, Z. Ahmed, Ho. Kang, G.V. Russo, L. Selvy, R. Paremuzyan, D. Flay, X. Zheng, S. Frullani, V. Bellini, L. Zana, M. Huang, Simon Širca, G. M. Huber, F. Garibaldi, H. Kang, M. Benali, A. Camsonne, Vincent Sulkosky, Juliette Mammei, Franco Meddi, Rolf Ent, J. Roche, D. Gaskell, J. Gomez, M. L. Sperduto, A. Shahinyan, P. Solvignon, Mustafa Canan, Kalyan Allada, M. Mihovilovic, N. Muangma, S. Iqbal, D. Wang, Douglas Higinbotham, F. Itard, T. Holmstrom, C. Muñoz Camacho, B. Zhao, A. Giusa, Tanja Horn, Département de Physique des Particules (ex SPP) (DPhP), 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, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), and Jefferson Lab Hall A

Subjects
Particle physics, longitudinal, interference, General Physics and Astronomy, parton: distribution function, Parton, hard exclusive electroproduction, mesons, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, pi: distribution amplitude, generalized parton distribution: transversity, Pion, deep inelastic scattering, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], quantum chromodynamics: perturbation theory, 010306 general physics, Nuclear Experiment, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, scattering amplitude, momentum transfer, Sigma, nucleon: generalized parton distribution, Scattering amplitude, transverse, Distribution (mathematics), Amplitude, pi0: electroproduction, twist, High Energy Physics::Experiment, Nucleon, channel cross section: measured, Jefferson Lab, experimental results
Abstract

We present deeply virtual $\pi^0$ electroproduction cross-section measurements at $x_B$=0.36 and three different $Q^2$--values ranging from 1.5 to 2 GeV$^2$, obtained from experiment E07-007 that ran in the Hall A at Jefferson Lab. The Rosenbluth technique was used to separate the longitudinal and transverse responses. Results demonstrate that the cross section is dominated by its transverse component, and thus is far from the asymptotic limit predicted by perturbative Quantum Chromodynamics. An indication of a non-zero longitudinal contribution is provided by the interference term $\sigma_{LT}$ also measured. Results are compared with several models based on the leading twist approach of Generalized Parton Distributions (GPDs). In particular, a fair agreement is obtained with models where the scattering amplitude is described by a convolution of chiral-odd (transversity) GPDs of the nucleon with the twist-3 pion distribution amplitude. Therefore, neutral pion electroproduction may offer the exciting possibility of accessing transversity GPDs through experiment., Comment: Submitted to Physical Review Letters

Published
2016
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13. Beam-Target Double-Spin AsymmetryALTin Charged Pion Production from Deep Inelastic Scattering on a Transversely PolarizedHe3Target at1.4<Q2<2.7 GeV2

Author

Jen-Chieh Peng, Wolfgang Korsch, L. Yuan, L. G. Tang, Nilanga Liyanage, K. Chirapatpimol, S. K. Nanda, Yujie Qiang, A. Shahinyan, Z. E. Meziani, H. J. Lu, X. Yan, Salvatore Frullani, Y. Li, D. J. Margaziotis, E. Cisbani, R. A. Lindgren, J. J. LeRose, A. Deur, L. Guo, E. Long, B. Zhao, X. Zhan, Ronald Gilman, I. Vilardi, H. Ding, Wouter Deconinck, A. Kelleher, G. Jin, R. Subedi, Diana Parno, X. Zheng, Bogdan Wojtsekhowski, Ronald Ransome, P. Bosted, Z. Ye, B. E. Norum, Xin Qian, Y. Zhang, W. Kim, Franco Garibaldi, B. Sawatzky, P. A. M. Dolph, Simon Širca, R. Michaels, J. C. Cornejo, C. Dutta, W. Chen, Douglas Higinbotham, M. K. Jones, B. Moffit, A. Camsonne, F. Cusanno, Vincent Sulkosky, X. Zong, A. J. R. Puckett, L. El Fassi, Xiaofeng Zhu, S. Golge, X. Li, C. Muñoz Camacho, K. Wang, Yingxiao Wang, M. Huang, G. D. Cates, M. Posik, Shalev Gilad, C. W. de Jager, X. Jiang, K. A. Aniol, M. H. Shabestari, M. Osipenko, Mauro Iodice, Y. X. Ye, William Bertozzi, H. F. Ibrahim, S. Marrone, Amrendra Narayan, Joseph M. Katich, D. Gaskell, David Hamilton, Pete Markowitz, Dipangkar Dutta, X. Deng, R. De Leo, J. P. Chen, S. S. Stepanyan, Mustafa Canan, Chen Chen, Kalyan Allada, T. Holmstrom, D. McNulty, E. Chudakov, T. Averett, J. Huang, G. M. Urciuoli, Young Do Oh, A. Tobias, Fatiha Benmokhtar, Abdurahim Rakhman, A. Kolarkar, M. M. Dalton, S. Riordan, A. Saha, Yong Zhang, Vladimir Nelyubin, Haiyan Gao, P. C. Bradshaw, S. K. Phillips, O. Glamazdin, Olfred Hansen, J. R. M. Annand, L. Y. Zhu, E. Schulte, and H. Yao

Subjects
Quark, Physics, Particle physics, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, General Physics and Astronomy, Parton, Electron, Deep inelastic scattering, 01 natural sciences, Asymmetry, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, media_common
Abstract

We report the first measurement of the double-spin asymmetry A_(LT) for charged pion electroproduction in semi-inclusive deep-inelastic electron scattering on a transversely polarized ^3He target. The kinematics focused on the valence quark region, 0.16

Published
2012
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14. Single Spin Asymmetries in Charged Pion Production from Semi-Inclusive Deep Inelastic Scattering on a Transversely PolarizedHe3Target atQ2=1.4–2.7 GeV2

Author

A. Kolarkar, M. Huang, X. Jiang, C. Dutta, M. Osipenko, T. Averett, H. Yao, W. Chen, Abdurahim Rakhman, L. G. Tang, Bogdan Wojtsekhowski, Y. X. Ye, X. Zhan, X. Yan, O. Glamazdin, Olfred Hansen, J. R. M. Annand, Fatiha Benmokhtar, D. McNulty, Arijit Saha, Diana Parno, W. Kim, Nilanga Liyanage, Wouter Deconinck, R. Subedi, D. J. Margaziotis, Salvatore Frullani, Chunhui Chen, P. Bosted, Yingxiao Wang, Yong Zhang, Shalev Gilad, Vladimir Nelyubin, Wolfgang Korsch, M. M. Dalton, Yuxiang Zhao, E. Cisbani, C. W. de Jager, K. A. Aniol, L. Guo, S. Riordan, E. Long, L. Y. Zhu, M. H. Shabestari, A. Kelleher, X. Li, S. K. Phillips, Mauro Iodice, E. Schulte, J. P. Chen, X. Deng, A. Shahinyan, G. Jin, X. Zheng, J. Huang, G. M. Urciuoli, S. K. Nanda, P. A. M. Dolph, Yujie Qiang, J. C. Cornejo, A. Tobias, William Bertozzi, S. Marrone, David Hamilton, Pete Markowitz, R. De Leo, Franco Garibaldi, Simon Širca, Ronald Ransome, S. S. Stepanyan, Xin Qian, Mustafa Canan, Kalyan Allada, B. Moffit, L. El Fassi, Xiaofeng Zhu, Z. E. Meziani, R. A. Lindgren, J. J. LeRose, I. Vilardi, H. Ding, B. Sawatzky, G. D. Cates, A. Camsonne, Vincent Sulkosky, Y. Li, X. Zong, R. Michaels, H. F. Ibrahim, C. Muñoz Camacho, Dipangkar Dutta, B. Zhao, A. J. R. Puckett, Haiyan Gao, E. Chudakov, T. Holmstrom, Young Do Oh, F. Cusanno, Douglas Higinbotham, M. K. Jones, A. Deur, M. Posik, P. C. Bradshaw, K. Wang, H. J. Lu, Jen-Chieh Peng, Ronald Gilman, L. Yuan, K. Chirapatpimol, Z. Ye, B. E. Norum, Y. Zhang, Amrendra Narayan, Joseph M. Katich, D. Gaskell, and S. Golge

Subjects
Physics, Particle physics, Proton, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Inelastic scattering, Deep inelastic scattering, 01 natural sciences, Baryon, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Lepton
Abstract

We report the first measurement of target single spin asymmetries in the semi-inclusive ^3He(e,e^′π^±)X reaction on a transversely polarized target. The experiment, conducted at Jefferson Lab using a 5.9 GeV electron beam, covers a range of 0.16

Published
2011
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15. Measurement of Directf0(980)Photoproduction on the Proton

Author

S. Park, Sylvain Bouchigny, V. Crede, J. R. Calarco, E. Wolin, C. E. Hyde, R. A. Schumacher, V. Sapunenko, Dinko Pocanic, P. Nadel-Turonski, L. Casey, V. Mokeev, D. Lawrence, J. P. Cummings, H. G. Juengst, B. E. Stokes, Cynthia Marie Hadjidakis, J. P. Ball, D. S. Carman, A. Fradi, A. V. Vlassov, P. Konczykowski, M. J. Amaryan, S. Dhamija, Michael Dugger, K. Livingston, D. S. Dale, T. Lee, Maryam Moteabbed, M. Kossov, S. E. Kuhn, L. Graham, Ashot Gasparian, B. B. Niczyporuk, C. I O Gordon, M. MacCormick, R. W. Gothe, Z. W. Zhao, R. Dickson, N. Gevorgyan, T. Kageya, H. Avakian, I. Hleiqawi, K. V. Dharmawardane, A.V. Stavinsky, J. Donnelly, G. Asryan, N. Pivnyuk, D. G. Crabb, J. Kuhn, M. E. McCracken, R. De Vita, S. Strauch, E. Clinton, S. Bültmann, S. L. Careccia, D. G. Jenkins, O. P. Dzyubak, D. P. Watts, H. Egiyan, Gerard Gilfoyle, G. Ricco, Lorenzo Zana, J. P. Santoro, C. Tur, L. Gan, Tsutomu Mibe, W. Gohn, T. A. Forest, D. J. Tedeschi, N. Markov, D. Sokhan, D. Sharov, W. Kim, S. Anefalos Pereira, S. Stepanyan, G. Niculescu, M. Yurov, J. Goett, R. A. Miskimen, I. Bedlinskiy, B. McKinnon, M. Y. Gabrielyan, J. Pierce, K. L. Giovanetti, F. X. Girod, Sergey Kuleshov, Avraham Klein, Shifeng Chen, N. Guler, E. Golovatch, Friedrich Klein, Larry Weinstein, N. A. Baltzell, G. E. Dodge, P. Khetarpal, K. A. Stopani, Brian Raue, D. Keller, H. Y. Lu, M. Nozar, D. Branford, J. Salamanca, H. S. Jo, C. Bookwalter, E. De Sanctis, L. Lesniak, G. Riccardi, J. M. Laget, V. V. Mochalov, P. Mattione, K. A. Griffioen, M. Aghasyan, X. Wei, V. Kuznetsov, M. S. Saini, P. V. Degtyarenko, A. I. Ostrovidov, D. I. Sober, A. Sandorfi, K. Park, P. Eugenio, Adam P. Szczepaniak, V. Batourine, C. Hanretty, A. Starostin, M. Guidal, N. Dashyan, M. Taiuti, W. J. Briscoe, E. Pasyuk, H. Hakobyan, S. A. Morrow, G. Rosner, J. T. Goetz, M. Mirazita, C. Djalali, Paolo Rossi, M. Khandaker, L. Bibrzycki, I. Niculescu, J. Lachniet, A. Tkabladze, Y. Ilieva, J. W. Price, M. Holtrop, R. A. Niyazov, Elton Smith, D. G. Ireland, A. Daniel, A. Teymurazyan, I. I. Strakovsky, G. Gavalian, N. Hassall, M. Bellis, P. Ambrozewicz, P. Collins, B. Zhao, R. De Masi, S. Tkachenko, D. Schott, M. Ripani, D. Doughty, P. Stoler, J. J. Melone, S. Niccolai, Z. Krahn, Volker D. Burkert, A. S. Biselli, M. Anghinolfi, C. Salgado, N. Benmouna, J. Langheinrich, S. S. Stepanyan, D. Heddle, J. D. Kellie, A. Deur, N. Baillie, T. Mineeva, S. Malace, Mark W. Paris, J. R. Johnstone, Hall Crannell, M. Osipenko, V. P. Kubarovsky, Y. G. Sharabian, Laird Kramer, L. Cheng, W. K. Brooks, J. Hardie, F. W. Hersman, R. S. Hakobyan, L. Guo, M. Ungaro, B. Moreno, O. Pogorelko, G. S. Mutchler, K. Hicks, Nikolay Shvedunov, D. Protopopescu, B. L. Berman, K. S. Egiyan, L. El Fassi, S. Pozdniakov, M. Garçon, Michael Wood, K. Mikhailov, K. Hafidi, V. S. Serov, M. Battaglieri, N. Kalantarians, R. Bradford, B. A. Mecking, R. Nasseripour, K. Joo, A. Yegneswaran, Michael Vineyard, V. Gyurjyan, J. Zhang, H. Bagdasaryan, L. Todor, R. G. Fersch, C. Paterson, Ji Li, P. L. Cole, M. D. Mestayer, E. L. Isupov, Michael L. Williams, M. M. Ito, S. Boiarinov, F. Sabatié, L. C. Smith, E. Munevar, B. S. Ishkhanov, M. R. Niroula, M. Lowry, Latifa Elouadrhiri, R. C. Minehart, Kei Moriya, C. A. Meyer, G. V. Fedotov, K. P. Adhikari, D. P. Weygand, O. Glamazdin, Alexei V. Klimenko, Y. Prok, Barry Ritchie, and I. Nakagawa

Subjects
Physics, Particle physics, Proton, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, General Physics and Astronomy, Resonance, 01 natural sciences, 7. Clean energy, Nuclear physics, Particle decay, Pion, 0103 physical sciences, 010306 general physics, Nucleon
Abstract

We report on the results of the first measurement of exclusive f{sub 0}(980) meson photoproduction on protons for E{sub {gamma}}=3.0-3.8 GeV and -t=0.4-1.0 GeV{sup 2}. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. The resonance was detected via its decay in the {pi}{sup +}{pi}{sup -} channel by performing a partial wave analysis of the reaction {gamma}p{yields}p{pi}{sup +}{pi}{sup -}. Clear evidence of the f{sub 0}(980) meson was found in the interference between P and S waves at M{sub {pi}{sup +}}{sub {pi}{sup -}}{approx}1 GeV. The S-wave differential cross section integrated in the mass range of the f{sub 0}(980) was found to be a factor of about 50 smaller than the cross section for the {rho} meson. This is the first time the f{sub 0}(980) meson has been measured in a photoproduction experiment.

Published
2009
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16. Photoproduction of pi+pi- meson pairs on the proton

Author

A. V. Vlassov, M. J. Amaryan, S. L. Careccia, E. Golovatch, W. Kim, R. De Vita, K. L. Giovanetti, D. Protopopescu, Martin K. Mayer, Larry Weinstein, D. P. Watts, H. Egiyan, S. Pozdniakov, M. Garçon, P. Khetarpal, Lorenzo Zana, G. E. Dodge, H. Y. Lu, Adam P. Szczepaniak, A. D'Angelo, I. Niculescu, C. S. Nepali, J. T. Goetz, K. Livingston, D. S. Dale, H. Hakobyan, L. Gan, M. Battaglieri, E. De Sanctis, Saini, Diane Schott, A. Deur, C. Hanretty, I. Nakagawa, A. I. Ostrovidov, B. Zhao, S. Fegan, D. I. Sober, K. Park, M. Y. Gabrielyan, L. Bibrzycki, A.V. Stavinsky, M. Khandaker, C. Bookwalter, D. G. Ireland, K. Moriya, P. Stoler, D. J. Tedeschi, Volker D. Burkert, A. S. Biselli, E. Wolin, Sergey Kuleshov, M. Osipenko, K. A. Griffioen, D. Doughty, Y. Prok, Gerard Gilfoyle, D. S. Carman, P. Eugenio, M. Taiuti, O. Glamazdin, K. Hicks, I. Bedlinskiy, A. Fradi, A. Gasparian, M. Kossov, Andreas Klein, D. Sokhan, N. Dashyan, J. Goett, B. McKinnon, Mokeev, M. Guidal, Barry Ritchie, Yordanka Ilieva, N. Hassall, M. Bellis, S. Park, K. Mikhailov, W. Gohn, S. Dhamija, D. Branford, S. Pisano, P. Collins, M. Mirazita, A. Teymurazyan, H. Baghdasaryan, R. W. Gothe, Leonard Lesniak, F. Sabatié, P. Rossi, J. M. Laget, Niroula, M. Holtrop, A. Daniel, E. L. Isupov, Crede, SA Pereira, Michael L. Williams, C. A. Meyer, G. V. Fedotov, S. Niccolai, S. Tkachenko, Mark W. Paris, M. Ripani, Carlos A. Salgado, Mochalov, M. Anghinolfi, K. P. Adhikari, Kuznetsov, D. P. Weygand, N. Pivnyuk, Michael Vineyard, C. Djalali, Drozdov, H. Seraydaryan, Y. G. Sharabian, P. L. Cole, Z. W. Zhao, M. E. McCracken, P. Nadel-Turonski, L. Guo, M. Ungaro, K. Joo, S. S. Stepanyan, C. E. Hyde, G. Rosner, J. Zhang, J. W. Price, R. A. Schumacher, G. Ricco, S. Stepanyan, W. J. Briscoe, E. Pasyuk, Brian Raue, Frank Klein, E. Munevar, Dustin Keller, A. Kubarovsky, Johnstone, Strakovsky, E. Clinton, Michael Wood, K. Hafidi, T. Mineeva, O. Pogorelko, Kubarovsky, F. X. Girod, S. Strauch, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), 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
PI-PI-DYNAMICS, COUPLED-CHANNEL, DIFFRACTION DISSOCIATION, POLARIZED PHOTONS, HIGH-STATISTICS, GEV-C, SYSTEM, MODEL, CLAS, CHAMBER, Nuclear and High Energy Physics, Particle physics, Meson, Proton, PI-PI-DYNAMICS, Photon energy, 01 natural sciences, 7. Clean energy, POLARIZED PHOTONS, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Particle decay, Pion, CLAS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nuclear Experiment, Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, DIFFRACTION DISSOCIATION, Momentum transfer, COUPLED-CHANNEL, HIGH-STATISTICS, GEV-C, SYSTEM, MODEL, CHAMBER, Production (computer science), High Energy Physics::Experiment
Abstract

The exclusive reaction $$\gamma p \to p \pi^+ \pi^-$$ was studied in the photon energy range 3.0 - 3.8 GeV and momentum transfer range $0.4

Published
2009
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17. Probing cold dense nuclear matter

Author

Jrm Annand, P. Monaghan, B. Craver, B. D. Anderson, Pete Markowitz, R. Shneor, J. LeRose, E. Voutier, Yujie Qiang, Fatiha Benmokhtar, J. P. Chen, V. A. Punjabi, M. Potokar, G. J. Kumbartzki, R. Igarashi, R. A. Lindgren, Nilanga Liyanage, S. A. Wood, T. Holmstrom, G. M. Urciuoli, A. Kolarkar, V. Sulkosky, P. Solvignon, Bogdan Wojtsekhowski, Guy Ron, H. Benaoum, H. F. Ibrahim, A. Kelleher, J. Reinhold, Larry Weinstein, Simon Širca, F. Garibaldi, R. Subedi, C. F. Perdrisat, D. G. Meekins, B. Sawatzky, J. O. Hansen, W. U. Boeglin, S. Frullani, L. Zhu, Karl Slifer, Eli Piasetzky, X. Zheng, Shalev Gilad, C. W. de Jager, K. A. Aniol, Bryan J. Moffit, L. J. Kaufman, J. W. Watson, O. Glamazdin, A. Shahinyan, M. Mazouz, G. Rosner, R. Michaels, E. Cisbani, Arijit Saha, John Arrington, X. Jiang, Seonho Choi, Ronald Gilman, Douglas Higinbotham, E. Jans, D. J. Margaziotis, S. Marrone, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Multidisciplinary, Proton, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Strong interaction, Momentum transfer, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear matter, 01 natural sciences, 7. Clean energy, Baryon, Nuclear physics, Neutron star, 0103 physical sciences, Physics::Accelerator Physics, Neutron, Nuclear Experiment (nucl-ex), Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment
Abstract

The protons and neutrons in a nucleus can form strongly correlated nucleon pairs. Scattering experiments, where a proton is knocked-out of the nucleus with high momentum transfer and high missing momentum, show that in 12C the neutron-proton pairs are nearly twenty times as prevalent as proton-proton pairs and, by inference, neutron-neutron pairs. This difference between the types of pairs is due to the nature of the strong force and has implications for understanding cold dense nuclear systems such as neutron stars., 12 pages, 5 figures

Published
2008
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18. Deeply virtual compton scattering off the neutron

Author

B. Zhao, Rolf Ent, P. Solvignon, V. Bellini, Mustafa Canan, Kalyan Allada, Tanja Horn, P. Nadel-Turonski, S. Koirala, G.V. Russo, C. M. Sutera, J. P. Chen, M. N. H. Rashad, Simon Širca, J. Huang, G. M. Urciuoli, A. Shahinyan, S. Iqbal, G. M. Huber, F. Garibaldi, M. Friend, Douglas Higinbotham, D. J. Margaziotis, Kiadtisak Saenboonruang, M. L. Sperduto, Maxime Defurne, F. Itard, Cynthia Keppel, L. Selvy, N. Muangma, Ho. Kang, T. Holmstrom, L. Zana, Pete Markowitz, R. I. Pomatsalyuk, V. A. Punjabi, Arijit Saha, William A. Tobias, B. Sawatzky, Abdurahim Rakhman, Chunhui Chen, M. Huang, Juliette Mammei, J. LeRose, F. Sabatié, X. Zhan, R. De Leo, A. Giusa, M. Benali, H. Yao, R. Michaels, A. Kelleher, Jie Zhang, A. Camsonne, I. Korover, H. Kang, C. Munoz Camacho, M. Mazouz, A. Deur, M. Brossard, M. Mihovilovic, D. Wang, S. Frullani, Vincent Sulkosky, R. Paremuzyan, E. Fuchey, R. A. Lindgren, S. Riordan, Franco Meddi, C. Desnault, H. Albataineh, D. Flay, J. Roche, Bogdan Wojtsekhowski, S. Chandavar, P. Bertin, C. W. de Jager, K. A. Aniol, R. Subedi, D. G. Meekins, P. Zhu, Z. Ahmed, L. El Fassi, W. U. Boeglin, E. Long, J. Gomez, O. Glamazdin, Olfred Hansen, A. Martí Jiménez-Argüello, Yujie Qiang, Andrew Puckett, X. Zheng, David Gaskell, Z. W. Zhao, Z. Ye, M. Magne, Charles Hyde, N. Nuruzzaman, S. Golge, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), HALL A, Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Quark, Physics, Particle physics, Photon, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, Nuclear Theory, Compton scattering, FOS: Physical sciences, General Physics and Astronomy, Virtual particle, Parton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Isospin, 0103 physical sciences, 25.30.-c, 13.60.Fz, 13.85.Hd, 14.20.Dh, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Nuclear Experiment
Abstract

The present experiment exploits the interference between the Deeply Virtual Compton Scattering (DVCS) and the Bethe-Heitler processes to extract the imaginary part of DVCS amplitudes on the neutron and on the deuteron from the helicity-dependent D$({\vec e},e'\gamma)X$ cross section measured at $Q^2$=1.9 GeV$^2$ and $x_B$=0.36. We extract a linear combination of generalized parton distributions (GPDs) particularly sensitive to $E_q$, the least constrained GPD. A model dependent constraint on the contribution of the up and down quarks to the nucleon spin is deduced., Comment: Published in Phys. Rev. Lett

Published
2007
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19. Investigation of Proton-Proton Short-Range Correlations via theC12(e,e′pp)Reaction

Author

Yujie Qiang, Eli Piasetzky, P. Monaghan, William Bertozzi, B. Craver, H. Benaoum, H. F. Ibrahim, Pete Markowitz, N. Thompson, A. Shahinyan, B. D. Anderson, G. J. Kumbartzki, Bogdan Wojtsekhowski, G. Rosner, E. Chudakov, B. Sawatzky, H. Yao, J. O. Hansen, V. Sulkosky, P.Y. Bertin, R. Michaels, O. Glamazdin, John Arrington, L. Zhu, J. P. Chen, S. Frullani, J. Gomez, G. M. Urciuoli, Simon Širca, F. Garibaldi, A. Saha, P. Solvignon, A. Kelleher, L. J. Kaufman, S. A. Wood, T. Holmstrom, J. Reinhold, Olivier Gayou, Jrm Annand, D. J. Margaziotis, Guy Ron, S. Marrone, Shalev Gilad, R. Shneor, Larry Weinstein, P. E. Ulmer, Karl Slifer, A. Kolarkar, C. W. de Jager, M. Potokar, K. A. Aniol, E. Cisbani, E. Kuchina, R. J. Feuerbach, R. A. Lindgren, J. J. LeRose, J. W. Watson, Bryan J. Moffit, X. Zheng, V. A. Punjabi, D. G. Meekins, Fatiha Benmokhtar, R. Subedi, E. Voutier, C. F. Perdrisat, W. U. Boeglin, R. Igarashi, Nilanga Liyanage, Y. Jiang, Douglas Higinbotham, E. Jans, K. Wang, Seonho Choi, Ronald Gilman, B. Reitz, M. Mazouz, X. Jiang, and S. K. Nanda

Subjects
Nuclear reaction, Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Strong interaction, General Physics and Astronomy, 01 natural sciences, Baryon, Momentum, Nuclear physics, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Lepton
Abstract

In this work we present a simultaneous measurement of the 12C(e,e'p) and 12C(e,e'pp) reactions. This measurement was done as part of the E01-015 experiment at Hall A of Jefferson Lab, at Q2 = 2 (GeV/c) 2 , xB = 1.2, for an (e,e'p) missing-momentum range from 300 to 600 MeV/c. At these kinematics conditions, with a missing-momentum greater than the Fermi momentum of nucleons in a nucleus and far from the D excitation, nucleon-nucleon Short-Range Correlations (SRCs) are predicted to dominate the reaction. For 9.5 ± 2% of the 12C(e,e2p) events, a recoiling partner proton was observed in the opposite direction to the 12C(e,e2p) missing momentum vector with roughly equal momentum. This observation is an experimental signature for proton-proton short-range correlations (pp-SRC) in nuclei. Even though the probability of pp-SRCs in nuclei is small, they are important since they can teach us about the strong interaction at short distances. Moreover, as a manifestation of asymmetric

Published
2007
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20. Search forΘ++Pentaquarks in the Exclusive Reactionγp→K+K−p

Author

H. Avakian, P. Eugenio, M. Taiuti, Shifeng Chen, M. Battaglieri, P. Stoler, R. Bradford, G. Rosner, R. Nasseripour, J. Lachniet, W. J. Briscoe, E. Wolin, R. A. Schumacher, E. Pasyuk, G. Ricco, A. Tkabladze, P. Collins, J. J. Melone, E. Clinton, K. Hicks, L. Guo, M. Ungaro, L. Gan, J. P. Ball, K. S. Egiyan, Y. Prok, M. Y. Gabrielyan, B. E. Stokes, J. T. Goetz, R. S. Hakobyan, Ashot Gasparian, C. I O Gordon, M. Bellis, K. Mikhailov, L. C. Smith, Elton Smith, M. Guidal, K. Joo, R. A. Niyazov, S. Niccolai, V. Mokeev, B. S. Ishkhanov, Sylvain Bouchigny, A. Yegneswaran, E. De Sanctis, S. Bültmann, M. F. Vineyard, D. G. Crabb, L. Morand, O. Glamazdin, M. Anghinolfi, M. Holtrop, J. Kuhn, M. R. Niroula, P. Rossi, J. P. Cummings, Alexei V. Klimenko, Cynthia Marie Hadjidakis, J. Hardie, J. P. Santoro, S. Stepanyan, Friedrich Klein, Hong Lu, Michael Wood, Maryam Moteabbed, Bernhard Mecking, P. L. Cole, J. Donnelly, D. I. Sober, F. X. Girod, G. Asryan, R. De Vita, Y. G. Sharabian, O. P. Dzyubak, K. V. Dharmawardane, H. G. Juengst, K. Hafidi, Barry Ritchie, J. Pierce, Avraham Klein, Brian Raue, Daniel S. Carman, V. S. Serov, P. Nadel-Turonski, Tsutomu Mibe, Michael Dugger, M. Kossov, I. Nakagawa, V. Crede, V. Sapunenko, B. B. Niczyporuk, A.V. Stavinsky, Dinko Pocanic, C. E. Hyde-Wright, K. Park, H. O. Funsten, J. R. Calarco, V. Gyurjyan, N. Pivnyuk, N. A. Baltzell, I. I. Strakovsky, R. W. Gothe, M. Khandaker, S. E. Kuhn, Latifa Elouadrhiri, P. Coltharp, A. V. Vlassov, T. Lee, R. C. Minehart, C. A. Meyer, J. Zhang, Sergey Kuleshov, Hall Crannell, D. J. Tedeschi, U. Thoma, M. Nozar, G. V. Fedotov, M. M. Ito, V. P. Kubarovsky, H. Bagdasaryan, A. Deur, K. A. Griffioen, C. Tur, M. Osipenko, S. A. Morrow, Atilla Gonenc, C. Djalali, B. Zhao, J. Langheinrich, O. Pogorelko, S. S. Stepanyan, I. Bedlinskiy, D. P. Weygand, J. W. Price, W. K. Brooks, W. Kim, G. E. Dodge, J. D. Kellie, V. Mochalov, P. Ambrozewicz, F. W. Hersman, Federico Ronchetti, G. Niculescu, P. V. Degtyarenko, G. Gavalian, S. Tkachenko, N. Benmouna, M. MacCormick, I. Niculescu, D. Lawrence, M. Ripani, I. Hleiqawi, G. Riccardi, S. L. Careccia, R. De Masi, Nikolay Shvedunov, G. S. Mutchler, Gerard Gilfoyle, D. G. Jenkins, K. L. Giovanetti, C. Butuceanu, Larry Weinstein, D. Doughty, Laird Kramer, S. Strauch, H. Egiyan, K. Livingston, D. S. Dale, A. I. Ostrovidov, N. Baillie, J. Goett, R. A. Miskimen, B. McKinnon, D. G. Ireland, D. Branford, M. Mirazita, J. M. Laget, N. Guler, Volker D. Burkert, A. S. Biselli, E. N. Golovach, N. Markov, Y. Ilieva, V. Batourine, F. Sabatié, D. Protopopescu, S. Pozdniakov, M. Garçon, B. L. Berman, C. Paterson, L. Todor, Lorenzo Zana, H. S. Jo, C. Salgado, Ji Li, M. D. Mestayer, E. L. Isupov, Michael L. Williams, S. Boiarinov, and A. Teymurazyan

Subjects
Physics, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, 01 natural sciences, Pentaquark, Baryon, Particle decay, Pair production, Isospin, 0103 physical sciences, Production (computer science), Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The reaction {gamma}p{yields}pK{sup +}K{sup -} was studied at Jefferson Lab with photon energies from 1.8 to 3.8 GeV using a tagged photon beam. The goal was to search for a {theta}{sup ++} pentaquark, a narrow, doubly charged baryon state having strangeness S=+1 and isospin I=1, in the pK{sup +} invariant mass spectrum. No statistically significant evidence of a {theta}{sup ++} was found. Upper limits on the total and differential cross section for the reaction {gamma}p{yields}K{sup -}{theta}{sup ++} were obtained in the mass range from 1.5 to 2.0 GeV/c{sup 2}, with an upper limit for a narrow resonance with a mass M{sub {theta}{sup ++}}=1.54 GeV/c{sup 2} of about 0.15 nb, 95% C.L.. This result places a stringent upper limit on the {theta}{sup ++} width {gamma}{sub {theta}{sup ++}}

Published
2006
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21. Search for theΘ+pentaquark in the reactionsγp→K¯0K+nandγp→K¯0K0p

Author

Latifa Elouadrhiri, R. C. Minehart, C. A. Meyer, G. V. Fedotov, Ji Li, J. Donnelly, G. Asryan, Elton Smith, O. P. Dzyubak, B. L. Berman, M. F. Vineyard, F. X. Girod, M. Anghinolfi, M. D. Mestayer, D. P. Weygand, E. L. Isupov, Michael L. Williams, H. Avakian, Y. G. Sharabian, M. Guidal, Atilla Gonenc, S. Boiarinov, C. Paterson, L. C. Smith, J. Goett, B. S. Ishkhanov, J. W. Price, M. Holtrop, Shifeng Chen, M. J. Amaryan, R. De Masi, M. Bellis, N. A. Baltzell, I. I. Strakovsky, P. Eugenio, K. A. Griffioen, K. S. Egiyan, Daniel S. Carman, J. P. Cummings, V. Batourine, C. E. Hyde-Wright, Sergey Kuleshov, M. Nozar, M. R. Niroula, W. J. Briscoe, M. Taiuti, E. Pasyuk, J. T. Goetz, R. De Vita, R. A. Schumacher, J. D. Kellie, O. Glamazdin, Alexei V. Klimenko, H. G. Juengst, Nikolay Shvedunov, F. Sabatié, K. Mikhailov, J. Langheinrich, S. S. Stepanyan, M. Kossov, V. Mochalov, A. Deur, V. Sapunenko, L. Todor, S. Strauch, Maryam Moteabbed, Bernhard Mecking, Z. W. Zhao, D. P. Watts, K. Park, K. V. Dharmawardane, A.V. Stavinsky, Dinko Pocanic, P. Collins, H. Egiyan, D. G. Jenkins, Lorenzo Zana, Ashot Gasparian, C. I O Gordon, J. J. Melone, S. E. Kuhn, W. K. Brooks, M. Battaglieri, H. Hakobyan, D. J. Tedeschi, H. S. Jo, C. Tur, S. Bültmann, V. P. Kubarovsky, P. Coltharp, S. A. Morrow, C. Djalali, P. Stoler, R. Bradford, C. Salgado, M. Khandaker, Barry Ritchie, L. Morand, O. Pogorelko, I. Bedlinskiy, P. Ambrozewicz, S. Stepanyan, G. S. Mutchler, K. Hicks, J. Kuhn, M. M. Ito, J. Pierce, Avraham Klein, V. Gyurjyan, J. P. Santoro, G. Gavalian, Michael Wood, K. Hafidi, B. B. Niczyporuk, S. Tkachenko, N. Benmouna, N. Pivnyuk, Hall Crannell, V. S. Serov, M. Ripani, M. MacCormick, I. Hleiqawi, G. Riccardi, Cynthia Marie Hadjidakis, A. Teymurazyan, S. L. Careccia, G. E. Dodge, H. Y. Lu, S. Niccolai, Michael Dugger, P. V. Degtyarenko, J. Hardie, H. O. Funsten, I. Niculescu, D. Lawrence, K. L. Giovanetti, C. Butuceanu, J. Zhang, Larry Weinstein, D. Doughty, E. Clinton, H. Bagdasaryan, G. Rosner, L. Gan, E. Wolin, R. Nasseripour, A. V. Vlassov, L. Guo, J. P. Ball, Y. Prok, M. Ungaro, T. Lee, D. G. Crabb, B. E. Stokes, V. Crede, J. R. Calarco, K. Joo, R. A. Niyazov, A. Yegneswaran, E. De Sanctis, D. I. Sober, B. Zhao, Victor Mokeev, I. Nakagawa, Sylvain Bouchigny, G. Ricco, M. Y. Gabrielyan, P. Rossi, Friedrich Klein, Brian Raue, F. W. Hersman, W. Kim, Federico Ronchetti, G. Niculescu, R. W. Gothe, M. Osipenko, U. Thoma, P. L. Cole, P. Nadel-Turonski, Tsutomu Mibe, J. Lachniet, A. Tkabladze, K. Livingston, D. S. Dale, R. S. Hakobyan, L. El Fassi, N. Guler, E. N. Golovach, Gerard Gilfoyle, D. Protopopescu, S. Pozdniakov, M. Garçon, Y. Ilieva, N. Baillie, R. A. Miskimen, B. McKinnon, Laird Kramer, D. Branford, M. Mirazita, J. M. Laget, N. Markov, A. I. Ostrovidov, D. G. Ireland, Volker D. Burkert, and A. S. Biselli

Subjects
Physics, Nuclear and High Energy Physics, Meson, Proton, 010308 nuclear & particles physics, Lambda baryon, 01 natural sciences, Pentaquark, Baryon, Crystallography, Particle decay, 0103 physical sciences, Mass spectrum, Production (computer science), Atomic physics, 010306 general physics
Abstract

The exclusive reactions {gamma}p {yields} {bar K}{sup 0} K{sup +} n and {gamma}p {yields} {bar K}{sup 0} K{sup 0} p have been studied in the photon energy range 1.6--3.8 GeV, searching for evidence of the exotic baryon {Theta}{sup +}(1540) in the decays {Theta}{sup +} {yields} nK{sup +} and {Theta}{sup +} {yields} pK{sup 0}. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. The integrated luminosity was about 70 pb{sup -1}. The reactions have been isolated by detecting the K{sup +} and proton directly, the neutral kaon via its decay to K{sub S} {yields} {pi}{sup +}{pi}{sup -} and the neutron or neutral kaon via the missing mass technique. The mass and width of known hyperons such as {Sigma}{sup +}, {Sigma}{sup -} and {Lambda}(1116) were used as a check of the mass determination accuracy and experimental resolution. Approximately 100,000 {Lambda}*(1520)'s and 150,000 {phi}'s were observed in the {bar K}{sup 0} K{sup +} n and {bar K}{sup 0} K{sup 0} p final state respectively. No evidence for the {Theta}{sup +} pentaquark was found in the nK{sup +} or pK{sub S} invariant mass spectra. Upper limits were set on the production cross section of the reaction {gamma}p {yields} {Theta}{supmore » +} {bar K}{sup 0} as functions of center-of-mass angle, nK{sup +} and pK{sub S} masses. Combining the results of the two reactions, the 95% C.L. upper limit on the total cross section for a resonance peaked at 1540 MeV was found to be 0.7 nb. Within most of the available theoretical models, this corresponds to an upper limit on the {Theta}{sup +} width, {Gamma}{sub {Theta}{sup +}}, ranging between 0.01 and 7 MeV.« less

Published
2006
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