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1. An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab

Author

Anthony W. Thomas, M. Battaglieri, R. De Vita, D. Marchand, Latifa Elouadrhiri, S. Habet, Hubert Spiesberger, P. Gueye, David Hamilton, Giovanni Salmè, A. Filippi, Pete Markowitz, D. Perera, G. Kalicy, M. Muhoza, N. Kalantarians, H. Atac, M. Khandaker, J. Xie, F. Sabatié, M. Mazouz, Ashot Gasparian, I.P. Fernando, V. Klimenko, T. A. Forest, D. McNulty, Z. E. Meziani, M. Boer, M. McCaughan, A. Asaturyan, J. P. Chen, V. Kozhuharov, S. Stepanyan, Simonetta Liuti, T. Patel, Alberto Accardi, M. Spata, Andrew Puckett, Andreas Metz, Salina Ali, V. Bellini, L. Barion, V. V. Berdnikov, Alexandre Camsonne, P. E. Reimer, M. Shabestari, P. Bisio, Simon Širca, T. Averett, J. Kim, Nikolaos Sparveris, M. Poelker, M. Spreafico, H. F. Ibrahim, Dipangkar Dutta, V. Bertone, Bogdan Wojtsekhowski, Ross Milner, H. Avakian, C. E. Hyde, P. M. King, Marc Vanderhaeghen, A. Somov, Yulia Furletova, Miha Mihovilovič, V. Tadevosyan, P. Sznajder, S. Migliorati, R. S. Beminiwattha, T. Chetry, M. Guidal, Olfred Hansen, T. Kutz, Z. W. Zhao, Barbara Pasquini, Eric Voutier, L. Lanza, M. J. Amaryan, J. R. M. Annand, Fatiha Benmokhtar, T. Gautam, H. Voskanyan, Richard Trotta, Ian L. Pegg, J. F. Owens, W. J. Briscoe, Jingyi Zhou, P. Valente, M. N. H. Rashad, Gordan Krnjaic, P. Lenisa, Elena Santopinto, Joseph Grames, M. Leali, S. Zhamkochyan, M. Caudron, Kai-Thomas Brinkmann, Elton Smith, L. Marsicano, Andrei Afanasev, Luciano Pappalardo, M. Carmignotto, Donal Day, L. Venturelli, Eugene Pasyuk, M. Ungaro, C. Peng, L. Causse, D. Hasell, G. Costantini, Douglas Higinbotham, N. D’Hose, J. Murphy, P. Chatagnon, R. Dupré, M. Bondì, Alexander Ilyichev, Matteo Rinaldi, P. Stoler, Brian Raue, G. N. Grauvogel, R. Santos Estrada, Kondo Gnanvo, K. Price, Q. Liu, S. Diehl, J. Nazeer, Y. G. Sharabian, X. Zheng, S. Niccolai, P. G. Blunden, J. Arrington, Riad Suleiman, J. Erler, S. Joosten, Andrea Bianconi, H.-S. Ko, P. L. Cole, Nilanga Liyanage, I. Albayrak, K. Joo, Jan C. Bernauer, F.-X. Girod, D. Gaskell, A. Kim, Juliette Mammei, A. Italiano, M. Hattawy, C. Ayerbe Gayoso, I. I. Strakovsky, M. Yurov, N. Randazzo, A. Deur, Wally Melnitchouk, H.-G. Zaunick, Michael Kohl, A. D'Angelo, E. Nardi, M. Paolone, C. Zorn, L. El Fassi, B. T. Kriesten, L. Darmé, M. Rathnayake, A. Shahinyan, Jie Zhang, Alessandro Rizzo, D. Flay, W. Xiong, H. Dutrieux, V. Sergeyeva, S. Zhang, E. R. Kinney, Hervé Moutarde, B. Dongwi, Axel Schmidt, Rolf Ent, S. Zhao, Volker D. Burkert, A. S. Tadepalli, A. S. Biselli, Tanja Horn, G. Niculescu, T. Cao, A. Celentano, P. Nadel-Turonski, Ethan Cline, J. Roche, B. Karky, M. Contalbrigo, H. Szumila-Vance, S. Fucini, O. Rondon-Aramayo, M. De Napoli, V. Mascagna, E. Fuchey, L. Cardman, G. Ciullo, Haiyan Gao, Cynthia Keppel, M. Ehrhart, A. Movsisyan, R. Novotny, A. Hobart, Sergio Scopetta, B. McKinnon, S. A. Wood, H. Mkrtchyan, M. Tiefenback, C. Munoz Camacho, Xinzhan Bai, R. Paremuzyan, B. Sawatzky, D. Sokhan, M. Suresh, Markus Diefenthaler, Z. Ye, Mauro Raggi, M. Kerver, Y. Roblin, A. Mkrtchyan, V. P. Kubarovsky, R. Capobianco, T. J. Hague, Dustin Keller, Sonny Mantry, Vladimir Khachatryan, Peter Schweitzer, Michael Wood, Maxime Defurne, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
cross-section, ratio, Photon, parton distributions, elastic scattering, Parton, polarized beam, Electron, Leptons Accelerators, Structure of Nucleons, 7. Clean energy, 01 natural sciences, Dark photon, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Positron, Economica, electromagnetic form-factors, virtual compton-scattering, generalized, squared 4-momentum transfers, lepton-flavor, violation, electron-proton, parity violation, pair production, Physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, Elastic scattering, Dark sector, JLab, dark photon, Settore FIS/04, lepton: flavor: violation, nucleon: generalized parton distribution, 3. Good health, High Energy Physics - Phenomenology, Elastic and deep inelastic Scattering, Nucleon, Jefferson Lab, Nuclear and High Energy Physics, nucleon: form factor: electromagnetic, FOS: Physical sciences, Socio-culturale, helium: target, Context (language use), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, PE2_2, PE2_1, deeply virtual Compton scattering, 0103 physical sciences, quantum chromodynamics, 010306 general physics, PE2_3, activity report, exchange: two-photon, electroweak interaction, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Ambientale, positron: beam, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], charge: asymmetry, Positron Beams, Physics::Accelerator Physics, proposal, High Energy Physics::Experiment
Abstract

Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental programs at the next generation of lepton accelerators. In the context of the hadronic physics program at Jefferson Lab (JLab), positron beams are complementary, even essential, tools for a precise understanding of the electromagnetic structure of nucleons and nuclei, in both the elastic and deep-inelastic regimes. For instance, elastic scattering of polarized and unpolarized electrons and positrons from the nucleon enables a model independent determination of its electromagnetic form factors. Also, the deeply-virtual scattering of polarized and unpolarized electrons and positrons allows unambiguous separation of the different contributions to the cross section of the lepto-production of photons and of lepton-pairs, enabling an accurate determination of the nucleons and nuclei generalized parton distributions, and providing an access to the gravitational form factors. Furthermore, positron beams offer the possibility of alternative tests of the Standard Model of particle physics through the search of a dark photon, the precise measurement of electroweak couplings, and the investigation of charged lepton flavor violation. This document discusses the perspectives of an experimental program with high duty-cycle positron beams at JLab., Comment: 18 pages, 7 figures This version superseeds the previous version which scientific content was decomposed into several more elaborated articles. All of these articles will be collected in the EPJ A Topical Issue about "Positron beam and physics at Jefferson Lab (e+@Jlab)"

Published
2021
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2. Virtual compton scattering under π0 threshold at Q2=0.33 GeV2. Preliminary results

Author

P. Bartsch, J.E. Ducret, I. Ewald, Ch. Hyde-Wright, P. Vernin, G. Quemener, R. Geiges, R. Van de Vyver, G. Tamas, Marc Vanderhaeghen, A. Wagner, P. Merle, N. d'Hose, O. Ravel, R. Edelhoff, P.Y. Bertin, J. Van de Wiele, M. Kahrau, Vincent Breton, J.M. Friedrich, J. Martino, J. Roche, H. Kramer, Th. Gousset, E. A. J. M. Offermann, W.U. Boeglin, D. Lhuillier, G. Rosner, T. Caprano, A. Liesenfeld, P.A.M. Guichon, P. Sauer, S. Derber, N. Degrande, M. O. Distler, R. Böhm, K. Merle, H. Holvoet, P. Jennewein, V. Kunde, Y. Roblin, J. Berthot, G. De Meyer, C. Marchand, S. Kerhoas, D. Marchand, J. Y. Mougey, B. Lannoy, Th. Pospischil, H. Schmieden, Michael Tytgat, Harald Merkel, H. Fonvieille, Th. Walcher, L. Van Hoorebeke, S. Schardt, Dirk Ryckbosch, K. W. Krygier, R. Neuhausen, S. Wolf, and M. Korn

Subjects
Physics, Massless particle, Nuclear reaction, Elastic scattering, Nuclear physics, Nuclear and High Energy Physics, Photon, Scattering, Momentum transfer, Compton scattering, Virtual particle, Atomic physics, Nuclear Experiment
Abstract

We have measured the absolute unpolarized cross sections for photon electro-production off the proton ep → epγ with the Three-Spectrometer-Setup at MAMI at a momentum transfer q=600 MeV/c and a virtual photon polarization ɛ=0.62. The momentum q ′ of the outgoing real photon range from 33 to 111 MeV/c. We extracted two combinations of the recently introduced generalized polarizabilities [1,2].

Published
1999
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3. Measurements of R=σL/σT for 0.03<x<0.1 and fit to world data

Author

P. Raines, Ingo Sick, S.St. Lorant, D. Kawall, H. Borel, H. Tang, C. Y. Prescott, J. M. Bauer, H. R. Band, R. G. Arnold, F. S. Dietrich, L. M. Stuart, T. Maruyama, Ch. Hyde-Wright, D. Walz, J. L. White, J. S. McCarthy, P. E. Bosted, G. Court, T. Averett, Vincent Breton, P. Grenier, B. Raue, Kevin P. Coulter, S. Hoibraten, Pascal Steiner, R. Erbacher, F. Staley, D. Reyna, O. Rondon, P.L. Anthony, K. A. Griffioen, A. Feltham, E. W. Hughes, D. Crabb, J. Button-Shafer, R. Prepost, S. E. Rock, Timothy Chupp, A. Rijllart, J. Gomez, Timothy B. Smith, Y. Terrien, J. A. Dunne, L. C. Smith, K. Witte, T. L. Usher, W. Meyer, C. C. Young, J. Fellbaum, J. R. Johnson, D. Zimmermann, Avraham Klein, J. Morgenstern, M. Kuriki, Y. Roblin, Donal Day, Z. E. Meziani, F. Suekane, J. P. Chen, H. Dutz, R. C. Minehart, B. Zihlmann, Emil Frlez, B. Youngman, Koji Abe, R. Antonov, R. M. Lombard-Nelsen, H. Fonvieille, L. S. Rochester, R. A. Lindgren, G. G. Petratos, R. Gearhart, J. Marroncle, F.R. Wesselmann, John C. Mitchell, H. Yuta, G. H. Zapalac, R. Pitthan, J. Clendenin, T. J. Liu, Dinko Pocanic, S. E. Kuhn, Z. M. Szalata, T. Akagi, M. Spengos, X.K. Maruyama, D. Garvey, C. Comptour, and M. Daoudi

Subjects
Physics, Nuclear and High Energy Physics, Cross section.transverse, 010308 nuclear & particles physics, Scattering, chemistry.chemical_element, Electron, 01 natural sciences, Nuclear physics, Cross section (physics), chemistry, 0103 physical sciences, 010306 general physics, Carbon
Abstract

Measurements were made at SLAC of the cross section for scattering 29 GeV electrons from carbon at a laboratory angle of 4.5°, corresponding to 0.03

Published
1999
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4. Deep inelastic scattering of polarized electrons by polarizedHe3and the study of the neutron spin structure

Author

W. Meyer, Sayed Rokni, Timothy Chupp, Y. Roblin, J. Morgenstern, C. C. Young, R. Prepost, H. Borel, E. W. Hughes, Z. M. Szalata, S. E. Rock, Timothy B. Smith, R. G. Arnold, H. Fonvieille, M. Woods, H. R. Band, F. S. Dietrich, P. E. Bosted, J. Fellbaum, F. Staley, H. Middleton, M. Spengos, Y. Terrien, Alan K. Thompson, L. M. Stuart, R. Erbacher, J. A. Dunne, T. Maruyama, J. Xu, Z. E. Meziani, Gilbert Shapiro, J. R. Johnson, N. R. Newbury, D. Kawall, G. G. Petratos, R. Holmes, G. H. Zapalac, J. Marroncle, P.L. Anthony, C. E. Keppel, James L. White, Vincent Breton, S. E. Kuhn, Gordon D. Cates, R. Pitthan, Paul A Souder, R. M. Lombard-Nelsen, and R. A. Gearhart

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, High density, Neutron, Electron, Spin structure, Nucleon, Deep inelastic scattering
Abstract

The neutron longitudinal and transverse asymmetries ${A}_{1}^{n}$ and ${A}_{2}^{n}$ have been extracted from deep inelastic scattering of polarized electrons by a polarized $^{3}\mathrm{He}$ target at incident energies of 19.42, 22.66, and 25.51 GeV. The measurement allows for the determination of the neutron spin structure functions ${g}_{1}^{n}(x, {Q}^{2})$ and ${g}_{2}^{n}(x, {Q}^{2})$ over the range $0.03lxl0.6$ at an average ${Q}^{2}$ of 2 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$. The data are used for the evaluation of the Ellis-Jaffe and Bjorken sum rules. The neutron spin structure function ${g}_{1}^{n}(x, {Q}^{2})$ is small and negative within the range of our measurement, yielding an integral $\ensuremath{\int}{0.03}^{0.6}{g}_{1}^{n}(x)\mathrm{dx}=\ensuremath{-}0.028\ifmmode\pm\else\textpm\fi{}0.006 (\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.006 (\mathrm{syst})$. Assuming Regge behavior at low $x$, we extract ${\ensuremath{\Gamma}}_{1}^{n}=\ensuremath{\int}{0}^{1}{g}_{1}^{n}(x)\mathrm{dx}=\ensuremath{-}0.031\ifmmode\pm\else\textpm\fi{}0.006 (\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.009 (\mathrm{syst})$. Combined with previous proton integral results from SLAC experiment E143, we find ${\ensuremath{\Gamma}}_{1}^{p}\ensuremath{-}{\ensuremath{\Gamma}}_{1}^{n}=0.160\ifmmode\pm\else\textpm\fi{}0.015$ in agreement with the Bjorken sum rule prediction ${\ensuremath{\Gamma}}_{1}^{p}\ensuremath{-}{\ensuremath{\Gamma}}_{1}^{n}=0.176\ifmmode\pm\else\textpm\fi{}0.008$ at a ${Q}^{2}$ value of 3 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$ evaluated using ${\ensuremath{\alpha}}_{s}=0.32\ifmmode\pm\else\textpm\fi{}0.05$.

Published
1996
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5. Measurements of the Q2-dependence of the proton and deuteron spin structure functions g1 and g1

Author

A. Rijllart, J. Marroncle, Z. M. Szalata, J. Clendenin, T. Akagi, P. Raines, H. Dutz, T. J. Liu, Dinko Pocanic, H. R. Band, M. Kuriki, J. P. Chen, John C. Mitchell, S. E. Kuhn, B. Youngman, R. Prepost, S.St. Lorant, D. Walz, G. Court, Ingo Sick, Timothy B. Smith, J. Gomez, X.K. Maruyama, D. Kawall, K. Witte, L. M. Stuart, T. Maruyama, P. E. Bosted, P.L. Anthony, J. Fellbaum, C. Comptour, M. Daoudi, C. E. Hyde-Wright, R. Pitthan, D. Garvey, C. Y. Prescott, W. Meyer, Avraham Klein, R. A. Lindgren, G. G. Petratos, M. Spengos, F. Staley, L.S. Rochester, C. C. Young, T. L. Usher, B. Raue, S. Hoibraten, R. C. Minehart, D. Zimmermann, Pascal Steiner, H. Yuta, P. Grenier, K. A. Griffioen, Timothy Chupp, L. C. Smith, F. Suekane, J. Morgenstern, J. R. Johnson, G. H. Zapalac, Donal Day, Y. Roblin, D. G. Crabb, H. Tang, J. Button-Shafer, Koji Abe, J. A. Dunne, H. Fonvieille, H. Borel, J. S. McCarthy, F. S. Dietrich, T. Averett, R. G. Arnold, R. Erbacher, Z. E. Meziani, D. Reyna, R. A. Gearhart, A. Feltham, E. W. Hughes, J. L. White, J. M. Bauer, Vincent Breton, Kevin P. Coulter, O. Rondon, S. E. Rock, Y. Terrien, B. Zihlmann, Emil Frlez, R. Antonov, and R. M. Lombard-Nelsen

Subjects
Nuclear physics, Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Deuterium, Proton, FOS: Physical sciences, Spin structure, High Energy Physics - Experiment
Abstract

The ratio g1/F1 has been measured over the range 0.031 (GeV/c)2. A trend is observed for g1/F1 to decrease at lower Q2. Fits to world data with and without a possible Q2-dependence in g1/F1 are in agreement with the Bjorken sum rule, but Delta_q is substantially less than the quark-parton model expectation., Comment: 16 pages, format is postscript file, gzip-ed, uuencode-ed

Published
1995
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6. Shower counters for SLAC experiments E142/E143

Author

R. A. Gearhart, M. Crouau, Y. Roblin, R. Lombard, B. Paul, J. Marroncle, J.P. Mouly, J. Le Meur, H. Fonvieille, J. Morgenstern, Y. Terrien, Vincent Breton, G. Savinel, F. Staley, P. Grenier, C. Comptour, H. Borel, J.C. Lugol, 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), and E142

Subjects
Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Measure (physics), Electron, 01 natural sciences, Linear particle accelerator, Particle detector, law.invention, Nuclear physics, Shower, Pion, law, 0103 physical sciences, Calibration, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Electrical and Electronic Engineering, 010306 general physics, Physics, 010308 nuclear & particles physics, Particle accelerator, Calorimeter, Electromagnetic calorimeter, Lead glass, Nuclear Energy and Engineering, visual_art, visual_art.visual_art_medium, High Energy Physics::Experiment
Abstract

We briefly describe the two electromagnetic calorimeters each made of 200 lead glass blocks used at SLAC to discriminate between electrons and pions and to measure electron energies. Procedures to reconstruct electron showers and to calibrate calorimeters are treated as well as the calorimeter performance. >

Published
1995
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7. Virtual Compton scattering and the generalized polarizabilities of the proton atQ2=0.92and 1.76 GeV2

Author

L. B. Auerbach, C. Cavata, D. J. Margaziotis, K. Kino, A. J. Sarty, Seigo Kato, J. A. Templon, B. Frois, Ronald Ransome, D. Rowntree, R. W. Lourie, Christophe Furget, P. Grenier, M. K. Jones, D. S. Dale, G. W. Miller, H. Voskanyan, C. Jutier, S. Frullani, Z. L. Zhou, C. R. Howell, W. Kahl, M. Khayat, A. T. Katramatou, M. Kuss, J. W. Watson, K. Wijesooriya, W. M. Zhang, J. Jardillier, G.I. Smirnov, David L. Prout, G. Laveissière, A. Deur, G. E. Dodge, J. R. Calarco, G. Fournier, N. Degrande, R. A. Lindgren, J. J. LeRose, R. I. Pomatsalyuk, E. J. Brash, W. U. Boeglin, V. Gorbenko, R. Suleiman, F. T. Baker, S. Platchkov, G. M. Huber, F. Garibaldi, Ronald Gilman, K. McCormick, G. Rutledge, T. Saito, Richard Madey, G. G. Petratos, Z. E. Meziani, K. Arundell, Marc Vanderhaeghen, J. Martino, James J. Kelly, S. Kox, J. Marroncle, L. Cardman, C. E. Hyde, Raphael Noel Tieulent, Z. Papandreou, Pierre A.M. Guichon, F. Merchez, Bogdan Wojtsekhowski, D. Marchand, E. Tomasi-Gustaffson, M. Liang, P. M. Rutt, F. Renard, Shalev Gilad, S. Mehrabyan, G. Quéméner, V. A. Punjabi, D. M. Manley, C. W. de Jager, R. L.J. van der Meer, K. A. Aniol, Nilanga Liyanage, A. Gasparian, B. D. Anderson, G. J. Lolos, M. B. Epstein, Richard Wilson, Branislav Vlahovic, L. C. Alexa, A. Ketikyan, P. E. Ulmer, A. V. Glamazdin, E. A.J.M. Offermann, Jing Zhao, P. Y. Bertin, L. Van Hoorebeke, T. Pussieux, Mauro Iodice, Larry Weinstein, Laird Kramer, T. Terasawa, Vincent Breton, J. Gao, C. F. Perdrisat, C. Marchand, D. Neyret, William Bertozzi, R. Michaels, R. Holmes, H. Fonvieille, D. G. Zainea, Charles Glashausser, C. C. Chang, K. S. Kumar, J. Domingo, Pavel Sorokin, Haiyan Gao, Pete Markowitz, L. Bimbot, R. Di Salvo, J. M. Finn, J. S. Real, Justin I. McIntyre, S. Jaminion, G. Kumbartzki, E. Chudakov, Barbara Pasquini, Latifa Elouadrhiri, N. d'Hose, Roberto Perrino, R. De Leo, M. Baylac, J. O. Hansen, J. P. Chen, R. Van de Vyver, G. M. Urciuoli, J. Berthot, H. Breuer, Kevin Fissum, L. A. Ewell, G. Audit, Kazushige Maeda, J. Mougey, O. Ravel, S. Malov, E. Burtin, M. Holtrop, J. Gomez, Thomas E. Smith, Paul Souder, H. Ueno, S. K. Nanda, Hiroaki Tsubota, S. Kerhoas, L. Todor, A. Leone, A. Saha, E. Voutier, K. Soldi, A. Serdarevic, Sebastien Incerti, Y. Roblin, P. Vernin, and E. Cisbani

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Chiral perturbation theory, Proton, 010308 nuclear & particles physics, Structure function, Compton scattering, 01 natural sciences, Nuclear physics, Amplitude, Dispersion relation, 0103 physical sciences, Beta (velocity), 010306 general physics
Abstract

Virtual Compton Scattering (VCS) on the proton has been studied at Jefferson Lab using the exclusive photon electroproduction reaction (e p --> e p gamma). This paper gives a detailed account of the analysis which has led to the determination of the structure functions P{sub LL}-P{sub TT}/epsilon and P{sub LT}, and the electric and magnetic generalized polarizabilities (GPs) alpha{sub E}(Q{sup 2}) and beta{sub M}(Q{sup 2}) at values of the four-momentum transfer squared Q{sup 2} = 0.92 and 1.76 GeV{sup 2}. These data, together with the results of VCS experiments at lower momenta, help building a coherent picture of the electric and magnetic GPs of the proton over the full measured Q{sup 2}-range, and point to their non-trivial behavior.

Published
2012
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8. Virtual Compton Scattering and Neutral Pion Electroproduction in the Resonance Region up to the Deep Inelastic Region at Backward Angles

Author

Seigo Kato, H. Ueno, K. Wijesooriya, R. Di Salvo, L. C. Alexa, G. W. Miller, H. Voskanyan, C. Jutier, J. Jardillier, E. Voutier, J. A. Templon, G. Rutledge, B. Frois, D. G. Zainea, C. C. Chang, E. Chudakov, David L. Prout, G. Laveissière, T. Terasawa, Vincent Breton, Mauro Iodice, Bogdan Wojtsekhowski, K. S. Kumar, Latifa Elouadrhiri, J. O. Hansen, A. Gasparian, K. Arundell, Pavel Sorokin, Sebastien Incerti, Larry Weinstein, P. Grenier, R. W. Lourie, W. Kahl, J. Berthot, G. Audit, L. B. Auerbach, T. Pussieux, G. Fournier, William Bertozzi, A. Deur, P. Vernin, Pierre A.M. Guichon, Ronald Ransome, Kazushige Maeda, K. Kino, N. Degrande, Pete Markowitz, D. Rowntree, Z. Papandreou, R. L.J. van der Meer, A. T. Katramatou, T. Saito, Richard Madey, Paul Souder, P. M. Rutt, S. K. Nanda, Roberto Perrino, R. De Leo, D. S. Dale, S. Mehrabyan, S. Kerhoas, J. M. Finn, W. U. Boeglin, D. J. Margaziotis, R. I. Pomatsalyuk, A. Ketikyan, L. Todor, A. Leone, M. Baylac, S. Jaminion, Nilanga Liyanage, S. Malov, E. Burtin, M. Holtrop, Thomas E. Smith, Richard Wilson, G. E. Dodge, R. Holmes, J. Marroncle, D. Marchand, E. Tomasi-Gustaffson, S. Platchkov, J. S. Real, J. Martino, Raphael Noel Tieulent, G.I. Smirnov, J. P. Chen, R. Van de Vyver, G. M. Urciuoli, Branislav Vlahovic, R. A. Lindgren, J. J. LeRose, C. R. Howell, Justin I. McIntyre, J. R. Calarco, L. Tiator, L. Bimbot, Arijit Saha, K. Soldi, O. Ravel, Hiroaki Tsubota, A. Serdarevic, C. E. Hyde, Y. Roblin, J. Y. Mougey, G. M. Huber, F. Garibaldi, E. Cisbani, J. Gomez, V. Gorbenko, J. W. Watson, F. Renard, L. Cardman, B. D. Anderson, G. J. Lolos, M. B. Epstein, F. T. Baker, F. Merchez, P. Y. Bertin, Haiyan Gao, M. Liang, G. Quéméner, D. Neyret, N. d'Hose, S. Frullani, Charles Glashausser, M. Khayat, H. Breuer, D. M. Manley, J. Gao, L. Van Hoorebeke, G. G. Petratos, Z. E. Meziani, V. A. Punjabi, L. A. Ewell, Ronald Gilman, K. McCormick, H. Fonvieille, Z. L. Zhou, A. V. Glamazdin, S. Kox, Jing Zhao, C. F. Perdrisat, R. Michaels, C. Marchand, M. K. Jones, C. Furget, P. E. Ulmer, Kevin Fissum, M. Kuss, James J. Kelly, E. J. Brash, Laird Kramer, Shalev Gilad, C. W. de Jager, K. A. Aniol, E. A.J.M. Offermann, C. Cavata, S.S. Kamalov, G. J. Kumbartzki, A. J. Sarty, W. M. Zhang, R. Suleiman, J. Domingo, 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 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, 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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), HALL A, 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 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)

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Scattering, Compton scattering, Resonance, FOS: Physical sciences, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Deep inelastic scattering, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Nuclear Experiment
Abstract

We have made the first measurements of the virtual Compton scattering (VCS) process via the H$(e,e'p)\gamma$ exclusive reaction in the nucleon resonance region, at backward angles. Results are presented for the $W$-dependence at fixed $Q^2=1$ GeV$^2$, and for the $Q^2$-dependence at fixed $W$ near 1.5 GeV. The VCS data show resonant structures in the first and second resonance regions. The observed $Q^2$-dependence is smooth. The measured ratio of H$(e,e'p)\gamma$ to H$(e,e'p)\pi^0$ cross sections emphasizes the different sensitivity of these two reactions to the various nucleon resonances. Finally, when compared to Real Compton Scattering (RCS) at high energy and large angles, our VCS data at the highest $W$ (1.8-1.9 GeV) show a striking $Q^2$- independence, which may suggest a transition to a perturbative scattering mechanism at the quark level., Comment: 20 pages, 8 figures. To appear in Phys.Rev.C

Published
2009
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9. Extraction of the neutron magnetic form factor from quasielastic3He→(e→,e') atQ2=0.1−0.6 (GeV/c)2

Author

B. Anderson, L. Auberbach, T. Averett, W. Bertozzi, T. Black, J. Calarco, L. Cardman, G. D. Cates, Z. W. Chai, J. P. Chen, Seonho Choi, E. Chudakov, S. Churchwell, G. S. Corrado, C. Crawford, D. Dale, A. Deur, P. Djawotho, D. Dutta, J. M. Finn, H. Gao, R. Gilman, A. V. Glamazdin, C. Glashausser, W. Glöckle, J. Golak, J. Gomez, V. G. Gorbenko, J.-O. Hansen, F. W. Hersman, D. W. Higinbotham, R. Holmes, C. R. Howell, E. Hughes, B. Humensky, S. Incerti, C. W. de Jager, J. S. Jensen, X. Jiang, C. E. Jones, M. Jones, R. Kahl, H. Kamada, A. Kievsky, I. Kominis, W. Korsch, K. Kramer, G. Kumbartzki, M. Kuss, E. Lakuriqi, M. Liang, N. Liyanage, J. LeRose, S. Malov, D. J. Margaziotis, J. W. Martin, K. McCormick, R. D. McKeown, K. McIlhany, Z.-E. Meziani, R. Michaels, G. W. Miller, J. Mitchell, S. Nanda, E. Pace, T. Pavlin, G. G. Petratos, R. I. Pomatsalyuk, D. Pripstein, D. Prout, R. D. Ransome, Y. Roblin, M. Rvachev, A. Saha, G. Salmè, M. Schnee, J. Seely, T. Shin, K. Slifer, P. A. Souder, S. Strauch, R. Suleiman, M. Sutter, B. Tipton, L. Todor, M. Viviani, B. Vlahovic, J. Watson, C. F. Williamson, H. Witała, B. Wojtsekhowski, F. Xiong, W. Xu, J. Yeh, and P. Żołnierczuk

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Plane wave, Elementary particle, 01 natural sciences, 7. Clean energy, Nuclear physics, Helium-3, 0103 physical sciences, Magnetic form factor, Neutron, Nuclear Experiment, 010306 general physics, Nucleon, Isotopes of helium
Abstract

We have measured the transverse asymmetry A{sub T{sup '}} in the quasielastic {sup 3}He-vector(e-vector,e{sup '}) process with high precision at Q{sup 2} values from 0.1 to 0.6 (GeV/c){sup 2}. The neutron magnetic form factor G{sub M}{sup n} was extracted at Q{sup 2} values of 0.1 and 0.2 (GeV/c){sup 2} using a nonrelativistic Faddeev calculation which includes both final-state interactions (FSI) and meson-exchange currents (MEC). Theoretical uncertainties due to the FSI and MEC effects were constrained with a precision measurement of the spin-dependent asymmetry in the threshold region of {sup 3}He-vector(e-vector,e{sup '}). We also extracted the neutron magnetic form factor G{sub M}{sup n} at Q{sup 2} values of 0.3 to 0.6 (GeV/c){sup 2} based on plane wave impulse approximation calculations.

Published
2007
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10. Publisher's Note: Proton elastic form factor ratios toQ2=3.5GeV2by polarization transfer [Phys. Rev. C 71, 055202 (2005)]

Author

R. J. Woo, Justin I. McIntyre, K. Wijesooriya, M. Khayat, P.Y. Bertin, C. F. Perdrisat, E. A. J. M. Offermann, Riad Suleiman, Y. Roblin, X. Jiang, A. Gasparian, R. A. Lindgren, J. J. LeRose, L. S. Cardman, J. Berthot, S. Malov, P. Vernin, J. A. Templon, L. Bimbot, V. Gorbenko, B. Diederich, D. S. Brown, Bogdan Wojtsekhowski, L. Todor, S. K. Nanda, S. Churchwell, Z. L. Zhou, Richard Madey, M. K. Jones, N. M. Piskunov, Shalev Gilad, E. Chudakov, K. A. Aniol, D. S. Dale, H. Voskanyan, Nilanga Liyanage, Brian Raue, G. M. Huber, F. Garibaldi, T. Saito, George Dan Zainea, G. G. Petratos, M. Kuss, Laird Kramer, A. V. Glamazdin, Z. Chai, G. Rutledge, David L. Prout, G. J. Kumbartzki, E. Lakuriki, G. J. Lolos, M. B. Epstein, G. Laveissière, B. D. Milbrath, C. Glashausser, Mauro Iodice, Lubomir Pentchev, S. Frullani, J. Y. Mougey, R. Roche, R. Michaels, A. Deur, R. L. Meer, A. J. Sarty, J. P. Chen, C. W. Jager, M. Liang, G. Quéméner, Branislav Vlahovic, H. Fonvieille, Andre Fleck, G. M. Urciuoli, C. R. Howell, J. R. Calarco, C. C. Chang, E. J. Brash, A. Green, D. J. Margaziotis, William Bertozzi, T. Smith, Ronald Gilman, J. Gao, R. I. Pomatsalyuk, Pavel Sorokin, Pete Markowitz, P. E. Ulmer, Kevin Fissum, W. Kahl, R. De Leo, K. McCormick, W.U. Boeglin, S. Strauch, G. M. Gerstner, J.-O. Hansen, Z. Papandreou, A. Besson, P. M. Rutt, Ronald Ransome, J. Domingo, F. Xiong, A. Saha, S. Jaminion, E. Cisbani, F. T. Baker, V. A. Punjabi, Jonatan Piedra Gomez, R. Macri, James J. Kelly, L. A. Ewell, and K. Takahashi

Subjects
Physics, Elastic scattering, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, Polarization (waves), 01 natural sciences, Typographical error
Abstract

This paper was published online on 20 May 2005 without several of the authors' corrections incorporated. Equation (13) has been replaced. The captions of Figs. 16--18 have also been replaced. Typographical errors on pages 4, 6, 14, 15, 18, 19, 22, and 24 have all been corrected. The paper has been corrected as of 8 June 2005. The text is correct in the printed version of the journal.

Published
2005
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11. Proton elastic form factor ratios toQ2=3.5GeV2by polarization transfer

Author

R. I. Pomatsalyuk, A. V. Glamazdin, Z. Chai, K. Wijesooriya, H. Fonvieille, M. Liang, G. Quéméner, Salvatore Frullani, C. F. Perdrisat, A. Gasparian, C. R. Howell, J. R. Calarco, K. McCormick, A. Green, J. A. Templon, P. Vernin, D. J. Margaziotis, Bogdan Wojtsekhowski, J. Y. Mougey, J. Berthot, F. T. Baker, E. J. Brash, L. Todor, R. Roche, J. Gao, M. Khayat, P.Y. Bertin, G. G. Petratos, S. K. Nanda, A. Deur, Z. L. Zhou, A. J. Sarty, R. J. Woo, A. Saha, L. Cardman, S. Jaminion, W. Kahl, B. Diederich, P. E. Ulmer, Franco Garibaldi, K. Takahashi, T. Saito, R. A. Lindgren, J. J. LeRose, D. S. Brown, G. M. Huber, Y. Roblin, G. M. Gerstner, R. Suleiman, V. Gorbenko, X. Jiang, V. A. Punjabi, S. Strauch, M. B. Epstein, Z. Papandreou, A. Besson, S. Churchwell, Charles Glashausser, E. Chudakov, Shalev Gilad, G. Laveissière, R. Madey, William Bertozzi, D. S. Dale, C. W. de Jager, K. A. Aniol, J. O. Hansen, G. M. Urciuoli, G. Kumbartzki, E. A.J.M. Offermann, Andre Fleck, Pete Markowitz, G. J. Lolos, Jian-Ping Chen, H. Voskanyan, Brian Raue, R. De Leo, S. Malov, P. M. Rutt, R. L.J. van der Meer, R. Macri, C. C. Chang, David L. Prout, J. Gomez, Pavel Sorokin, L. Bimbot, T. P. Smith, G. Rutledge, E. Lakuriki, B. D. Milbrath, M. K. Jones, N. M. Piskunov, M. Kuss, Ronald Gilman, M. Iodice, L. A. Ewell, James J. Kelly, F. Xiong, L. Pentchev, Ronald Ransome, W. U. Boeglin, Nilanga Liyanage, Branislav Vlahovic, E. Cisbani, Laird Kramer, Justin I. McIntyre, J. Domingo, Kevin Fissum, George Dan Zainea, and R. Michaels

Subjects
Physics, Quark, Nuclear and High Energy Physics, Photon, Proton, 010308 nuclear & particles physics, Polarimeter, Electron, Polarization (waves), 01 natural sciences, Nuclear physics, Transverse plane, Magnetization, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

The ratio of the proton elastic electromagnetic form factors, GEp/GMp, was obtained by measuring Pt and P, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic epepreaction in the four-momentum transfer squared range of 0.5 to 3.5 GeV2. In the single-photon exchange approximation, GEp/GMp is directly proportional to Pt/P. The simultaneous measurement of Pt and P in a polarimeter reduces systematic uncertainties. The results for GEp/GMp show a systematic decrease with increasing Q2, indicating for the first time a definite difference in the distribution of charge and magnetization in the proton. The data have been reanalyzed and their systematic uncertainties have become significantly smaller than those reported previously. (Less)

Published
2005
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12. Dynamics of the quasielasticO16(e,e′p)reaction atQ2≈0.8(GeV∕c)2

Author

A. V. Glamazdin, E. A.J.M. Offermann, Seigo Kato, D. M. Manley, H. Fonvieille, R. Roche, S. Malov, P.Y. Bertin, E. Burtin, M. Holtrop, J. Gomez, Jing Zhao, Nilanga Liyanage, R. W. Lourie, R. Michaels, S. Jaminion, R. Holmes, T. Terasawa, Vincent Breton, D. J. Margaziotis, Branislav Vlahovic, H. Voskanyan, C. Jutier, W. Kahl, F. T. Baker, C. F. Perdrisat, Leonid Levchuk, J. M. Finn, R. I. Pomatsalyuk, V. A. Punjabi, K. Joo, David L. Prout, Olivier Ravel, H. Ueno, Bogdan Wojtsekhowski, K. McCormick, P. Vernin, P. E. Ulmer, S. K. Nanda, S. Kerhoas, J. Y. Mougey, L. B. Auerbach, A. Leone, T. Pussieux, L. S. Cardman, Y. Roblin, S. van Verst, R. A. Lindgren, J. J. LeRose, G. M. Huber, Z. Papandreou, J. A. Templon, F. Garibaldi, T. Saito, M. Khayat, Dimitri Debruyne, P. M. Rutt, V. Gorbenko, B. Frois, Kevin Fissum, D. Neyret, G. G. Petratos, A. Saha, Z. E. Meziani, B. Diederich, C. E. Hyde-Wright, G. Rutledge, L. Bimbot, James J. Kelly, K. Kino, M. Liang, Wolfgang Korsch, J. S. McCarthy, T. P. Smith, G. Quéméner, S. Platchkov, Mauro Iodice, Kazushige Maeda, L. Todor, K. Wijesooriya, Justin I. McIntyre, J. W. Watson, Larry Weinstein, J. Martino, C. R. Howell, Hiroaki Tsubota, J. P. Chen, J. R. Calarco, N. d'Hose, Jan Ryckebusch, Z. L. Zhou, G. M. Urciuoli, D. G. Zainea, Ronald Gilman, Ronald Ransome, R. L.J. van der Meer, C. C. Chang, D. Rowntree, K. S. Kumar, J. Gao, B. D. Anderson, G. J. Lolos, M. B. Epstein, Pavel Sorokin, Laird Kramer, G. J. Kumbartzki, G. Laveissière, M. K. Jones, A. Gasparian, R. Madey, William Bertozzi, W. U. Boeglin, Pete Markowitz, D. S. Dale, M. Khandaker, V. Zeps, Roberto Perrino, R. De Leo, E. Cisbani, J. Berthot, S. Frullani, H. Breuer, E. J. Brash, J. R. Vignote, T. P. Gorringe, J. M. Udías, F. W. Hersman, L. A. Ewell, J. Domingo, Gordon D. Cates, Paul Souder, A. Serdarevic-Offermann, A. Deur, C. Cavata, A. Soldi, J.E. Ducret, A. J. Sarty, P. Djawotho, C. Glashausser, R. Suleiman, Shalev Gilad, C. W. de Jager, and K. A. Aniol

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Two-body problem, 01 natural sciences, Asymmetry, Eikonal approximation, Nuclear physics, Classical mechanics, 0103 physical sciences, Isobar, 010306 general physics, Relativistic quantum chemistry, Glauber, Oxygen-16, media_common
Abstract

The physics program in Hall A at Jefferson Lab commenced in the summer of 1997 with a detailed investigation of the ^(16)O(e,e′p) reaction in quasielastic, constant (q,ω) kinematics at Q^2≈0.8(GeV/c)^2, q≈1GeV/c, and ω≈445MeV. Use of a self-calibrating, self-normalizing, thin-film waterfall target enabled a systematically rigorous measurement. Five-fold differential cross-section data for the removal of protons from the 1p-shell have been obtained for 0

Published
2004
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13. Parity-violating electroweak asymmetry ine⃗pscattering

Author

J. Jardillier, Baris T. Tonguc, I. Younus, G. Rutledge, V. A. Punjabi, Mauro Iodice, F. Marie, R. Michaels, G. M. Urciuoli, D. J. Margaziotis, T. Pussieux, M. Leuschner, I. K. Kominis, X. Jiang, Justin I. McIntyre, R. De Leo, M. Coman, K. Wijesooriya, J. R. Calarco, P. Mastromarino, Andre Fleck, N. Falletto, T. Averett, B. Frois, Richard Madey, Marcus Spradlin, T. B. Humensky, Paul Souder, W. Xu, Olfred Hansen, T. Teresawa, D. Relyea, J.P. Jorda, Ronald Ransome, Bogdan Wojtsekhowski, James J. Kelly, J. Gao, J. Roche, M. Liang, G. Quéméner, B. D. Milbrath, F. Sabatié, A. Gasparian, J. A. Templon, D. W. Higinbotham, C. C. Chang, Kevin Fissum, M. B. Epstein, K. S. Kumar, J. Thompson, R. J. Woo, L. Todor, Gordon D. Cates, R. I. Pomatsalyuk, D. S. Dale, R. W. Lourie, J. M. Finn, A. Saha, John C. Mitchell, R. Suleiman, G. W. Miller, Daijin Kim, C. Jutier, R. Holmes, Sebastien Incerti, S. Malov, E. Burtin, M. Holtrop, W. Kahl, S. Strauch, P. E. Ulmer, P. Markowitz, S. Frullani, M. J. Kim, P. M. Rutt, Y. Roblin, D. Lhuillier, David L. Prout, G. M. Gerstner, Min Suk Kim, Jian-Ping Chen, F. Garibaldi, D. S. Armstrong, J. J. LeRose, K. Kramer, V. Gorbenko, M. Rvachev, J. Martino, G. G. Petratos, Edgar E. Kooijman, Z. E. Meziani, C. W. de Jager, K. A. Aniol, D. Neyret, Raphael Noel Tieulent, M. Baylac, F. W. Hersman, L. A. Ewell, J. S. Price, C. Cavata, Nilanga Liyanage, A. V. Glamazdin, Z. Chai, Richard Wilson, Branislav Vlahovic, E. Cisbani, J. Gomez, C. Zhang, L. Morand, Ronald Gilman, K. McCormick, E. Chudakov, P. Djawotho, Stephanie Escoffier, M. K. Jones, C. Pedrisat, M. Kuss, and A. Deur

Subjects
Nuclear reaction, Elastic scattering, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, Elementary particle, 01 natural sciences, Asymmetry, Baryon, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, media_common, Lepton
Abstract

We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from protons. Significant contributions to this asymmetry could arise from the contributions of strange form factors in the nucleon. The measured asymmetry is $A=\ensuremath{-}15.05\ifmmode\pm\else\textpm\fi{}0.98(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.56(\mathrm{syst})\phantom{\rule{0.3em}{0ex}}\mathrm{ppm}$ at the kinematic point $⟨{\ensuremath{\theta}}_{\mathrm{lab}}⟩=12.3\ifmmode^\circ\else\textdegree\fi{}$ and $⟨{Q}^{2}⟩=0.477\phantom{\rule{0.3em}{0ex}}{(\mathrm{GeV}∕c)}^{2}$. Based on these data as well as data on electromagnetic form factors, we extract the linear combination of strange form factors ${G}_{E}^{s}+0.392{G}_{M}^{s}=0.014\ifmmode\pm\else\textpm\fi{}0.020\ifmmode\pm\else\textpm\fi{}0.010$, where the first error arises from this experiment and the second arises from the electromagnetic form factor data. This paper provides a full description of the special experimental techniques employed for precisely measuring the small asymmetry, including the first use of a strained GaAs crystal and a laser-Compton polarimeter in a fixed target parity-violation experiment.

Published
2004
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14. Backward electroproduction ofπ0mesons on protons in the region of nucleon resonances at four momentum transfer squaredQ2=1.0GeV2

Author

P.Y. Bertin, M. K. Jones, B. D. Anderson, G. J. Lolos, M. B. Epstein, S. Frullani, R. W. Lourie, Jing Zhao, W. Kahl, M. Kuss, J. W. Watson, Y. Roblin, Bogdan Wojtsekhowski, William Bertozzi, L. S. Cardman, D. Neyret, S. Jaminion, R. Michaels, S. Platchkov, F. T. Baker, H. Ueno, Pete Markowitz, R. Di Salvo, T. Terasawa, Vincent Breton, M. Khayat, J. Martino, Raphael Noel Tieulent, Sebastien Incerti, A. Saha, L. B. Auerbach, E. J. Brash, G. E. Dodge, V. A. Punjabi, R. A. Lindgren, Richard Madey, G. J. Kumbartzki, G. Laveissière, Z. Papandreou, J. J. LeRose, P. M. Rutt, O. Ravel, Roberto Perrino, R. De Leo, D. J. Margaziotis, J. A. Templon, Ronald Ransome, D. Rowntree, M. Baylac, J. P. Chen, A. Deur, P. Vernin, B. Frois, G. G. Petratos, Z. E. Meziani, K. Kino, E. Chudakov, J. O. Hansen, Justin I. McIntyre, R. I. Pomatsalyuk, K. Wijesooriya, Hiroaki Tsubota, A. Ketikyan, Z. L. Zhou, K. Soldi, A. Serdarevic, L. Bimbot, H. Breuer, M. Liang, R. Van de Vyver, G. M. Urciuoli, A. T. Katramatou, L. C. Alexa, G. Quéméner, V. Gorbenko, F. Renard, N. d'Hose, S. K. Nanda, S. Malov, E. Burtin, J. Domingo, C. R. Howell, J. R. Calarco, J. M. Finn, S. Kerhoas, M. Holtrop, J. Gomez, Thomas E. Smith, C. F. Perdrisat, C. Glashausser, E. Cisbani, W. U. Boeglin, Philippe Grenier, Latifa Elouadrhiri, G. Audit, A. Gasparian, C. E. Hyde-Wright, L. Todor, A. Leone, L. Tiator, S. Mehrabyan, L. A. Ewell, Kazushige Maeda, C. Furget, D. M. Manley, Kevin Fissum, D. G. Zainea, J. Jardillier, J. Gao, K. Arundell, R. Holmes, G. Rutledge, C. C. Chang, L. Van Hoorebeke, K. S. Kumar, Ronald Gilman, K. McCormick, Mauro Iodice, Nilanga Liyanage, H. Fonvieille, Pierre A.M. Guichon, Pavel Sorokin, Larry Weinstein, P. E. Ulmer, Paul Souder, A. V. Glamazdin, Haiyan Gao, R. L.J. van der Meer, S. Kox, G. M. Huber, F. Garibaldi, T. Saito, Richard Wilson, Laird Kramer, J. Y. Mougey, E. Voutier, Branislav Vlahovic, F. Merchez, G. Fournier, James J. Kelly, C. Marchand, Seigo Kato, G. W. Miller, H. Voskanyan, C. Jutier, David L. Prout, T. Pussieux, W. M. Zhang, J. Berthot, R. Suleiman, C. Cavata, S.S. Kamalov, G. Smirnov, A. J. Sarty, Shalev Gilad, C. W. de Jager, K. A. Aniol, E. A.J.M. Offermann, N. Degrande, J. Marroncle, D. Marchand, E. Tomasi-Gustaffson, J. S. Real, and D. S. Dale

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Momentum transfer, Sigma, 01 natural sciences, Nuclear physics, Baryon, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Lepton
Abstract

Exclusive electroproduction of pi{sup 0} mesons on protons in the backward hemisphere has been studied at Q2 = 1.0 GeV2 by detecting protons in the forward direction in coincidence with scattered electrons from the 4 GeV electron beam in Jefferson Lab's Hall A. The data span the range of the total (gamma*p) center-of-mass energy W from the pion production threshold to W = 2.0 GeV. The differential cross sections sigma{sub T} + epsilon sigma{sub L}, sigma{sub TL}, and sigma{sub TT} were separated from the azimuthal distribution and are presented together with the MAID and SAID parameterizations.

Published
2004
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15. Basic instrumentation for Hall A at Jefferson Lab

Author

T. Pussieux, Paul Souder, J. H. Mitchell, Y. Roblin, O. Ravel, E. Chudakov, K. A. Griffioen, C. Cavata, J. A. Templon, H. F. Ibrahim, J. S. McCarthy, M. A. Stevens, D. P. Watts, B. Frois, W. J. Schneider, Dipangkar Dutta, R. Di Salvo, R. I. Pomatsalyuk, A. Soldi, G. J. Kumbartzki, Arijit Saha, N. Colombel, J. Berthot, Jing Zhao, A. J. Sarty, B. D. Anderson, J. Martine, M. Coman, R. Michaels, M. B. Epstein, R. W. Lourie, J. O. Hansen, N. Degrande, J. Mclntyre, John Arrington, L. Zhu, W. Kahl, Bogdan Wojtsekhowski, P. Djawotho, M. Leuschner, William Bertozzi, K. A. Aniol, A. Gasparian, Karl Slifer, Jrm Annand, C. F. Perdrisat, D. Pripstein, M. Baylac, S. Kox, X. Jiang, K. Kramer, H. Breuer, David Hamilton, Jian-Ping Chen, T. Averett, L. B. Auerbach, G. A. Rutledge, G. Quéméner, Stephanie Escoffier, P.Y. Bertin, R. Suleiman, R. Carr, Pete Markowitz, A. Deur, Z. Papandreou, R. L. Walter, R. D. McKeown, T. P. Gorringe, M. Rvachev, R. Holmes, S. Churchwell, J. Marroncle, S. Platchkov, M. Khandaker, M. Liang, L. Pierangeli, K. Kino, A. Ketikyan, Kevin Fissum, F. W. Hersman, J. LeRose, F. Giuliani, P. E. Ulmer, Roberto Perrino, R. De Leo, J. Gao, L. A. Ewell, S. Jensen, R. Crateri, Shalev Gilad, C. W. de Jager, D. Lhuillier, J.E. Ducret, M. Gricia, R. Iommi, F. Sabatavenere, P. A. Zolnierczuk, K. Wijesooriya, Alan M. Nathan, D. Rowntree, E. Voutier, H. Holmgren, S. K. Nanda, D. G. Meekins, K. S. Egiyan, C. R. Howell, A. Serdarevic-Offermann, Hiroaki Tsubota, D. G. Zainea, J. R. Calarco, S. Esp, T. Terasawa, Vincent Breton, C. C. Chang, J. Domingo, T. Black, A. T. Katramatou, S. Kerhoas, F. Santavenere, J. Y. Mougey, R. Van de Vyver, G. M. Urciuoli, Seigo Kato, G. M. Huber, B. Reitz, E. J. Beise, K. S. Kumar, F. Garibaldi, Pavel Sorokin, G. J. Lolos, M. Lucentini, J. Segal, H. Xiang, D. V. Boykin, W. U. Boeglin, C. Glashausser, E. Cisbani, A. Leone, R. D. Ransomez, Gordon D. Cates, Sonja Dieterich, H. Voskanyan, C. Jutier, R. L.J. van der Meer, Olivier Gayou, James A. Miller, L. Van Hoorebeke, Sebastien Incerti, J. Jardillier, L. Cardman, James J. Kelly, F. Xiong, S. Jaminion, I. K. Kominis, K. McCormick, P. Vernin, P. M. Rutt, A. Petrosyan, David L. Prout, Nilanga Liyanage, L. Lagamba, X. Zheng, S. L. Spiegel, Branislav Vlahovic, Leonid Levchuk, Mauro Iodice, Larry Weinstein, F. Marie, D. G. Ireland, N. S. Chant, David Manley, V. A. Punjabi, C. E. Jones, J. Gomez, Wolfgang Korsch, W. Xu, J. W. Watson, M. Roedelbronn, F. T. Baker, Z. E. Meziani, T. Saito, S. Frullani, H. Ueno, E. J. Brash, R. Roche, E. Hovhannisyan, C. E. Hyde-Wright, N. d'Hose, L. Bimbot, G. Laveissière, R. Madey, Kazushige Maeda, A. Gavalya, W. Miller, D. Neyret, T. P. Smith, B. Diederich, E. Burtin, M. Holtrop, L. Todor, G. Dezern, Z. L. Zhou, K. Livingston, D. S. Dale, V. Zeps, S. Mayilyan, E. Folts, B. D. Milbrath, Haiyan Gao, J. M. Finn, O. Rondon-Aramayo, R. A. Lindgren, V. Gorbenko, A. V. Glamazdin, Z. Chai, E. A.J.M. Offermann, S. Malov, J. Alcorn, S. Strauch, A. Shahinyan, G. Rosner, H. Fonvieille, P. G. Roos, E. W. Hughes, K. Joo, D. S. Brown, P. Brindza, G. G. Petratos, S. van Verst, M. Khayat, S. Colilli, Douglas Higinbotham, M. K. Jones, D. J. Margaziotis, M. Kuss, Seonho Choi, Ronald Gilman, Thomas Jefferson National Accelerator Facility (Jefferson Lab), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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), HALL A, 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 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, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Cryogenics, Scintillator, 7. Clean energy, 01 natural sciences, Particle identification, Magnetic field, Nuclear physics, Cardinal point, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, 010306 general physics, Nucleon, Instrumentation, Cherenkov radiation
Abstract

The instrumentation in Hall A at the Thomas Jefferson National Accelerator Facility was designed to study electro-and photo-induced reactions at very high luminosity and good momentum and angular resolution for at least one of the reaction products. The central components of Hall A are two identical high resolution spectrometers, which allow the vertical drift chambers in the focal plane to provide a momentum resolution of better than 2 x 10(-4). A variety of Cherenkov counters, scintillators and lead-glass calorimeters provide excellent particle identification. The facility has been operated successfully at a luminosity well in excess of 10(38) CM-2 s(-1). The research program is aimed at a variety of subjects, including nucleon structure functions, nucleon form factors and properties of the nuclear medium. (C) 2003 Elsevier B.V. All rights reserved.

Published
2004
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16. Plane-wave impulse approximation extraction of the neutron magnetic form factor from quasielastic3He→(e→,e′)atQ2=0.3to0.6(GeV/c)2

Author

G. G. Petratos, Z. E. Meziani, J. M. Finn, A. Saha, W. Xu, J. P. Chen, D. Pripstein, J. S. Jensen, C. E. Jones, K. McCormick, Dipangkar Dutta, C. R. Howell, P. Żołnierczuk, S. Churchwell, A. Kievsky, R. I. Pomatsalyuk, J. R. Calarco, Ronald Ransome, G. S. Corrado, T. Black, Sebastien Incerti, K. Kramer, E. Chudakov, Emanuele Pace, R. Holmes, John C. Mitchell, T.W. Donnelly, D. S. Dale, M. K. Jones, Gordon D. Cates, K. McIlhany, E. Lakuriqi, T. Averett, M. Liang, J. O. Hansen, G. J. Kumbartzki, B. D. Anderson, Jacek Golak, Bogdan Wojtsekhowski, W. Glöckle, F. W. Hersman, S. Strauch, P. Djawotho, E. W. Hughes, D. W. Higinbotham, B. Humensky, Haiyan Gao, D. J. Margaziotis, C. F. Williamson, L. Auberbach, C. Glashausser, Karl Slifer, M. Sutter, J. Yeh, M. Viviani, Wolfgang Korsch, S. K. Nanda, M. Kuss, I. K. Kominis, C. W. de Jager, B. Tipton, William Bertozzi, F. Xiong, C. Crawford, J. W. Watson, Nilanga Liyanage, A. Deur, Hiroyuki Kamada, R. D. McKeown, R. Michaels, G. Salme, Y. Roblin, Branislav Vlahovic, Seonho Choi, L. S. Cardman, R. Suleiman, R. Kahl, L. Todor, S. Malov, J. Gomez, M. Schnee, J. W. Martin, Henryk Witała, Ronald Gilman, Paul Souder, T. Pavlin, G. W. Miller, David L. Prout, X. Jiang, M. Rvachev, T. Shin, A. V. Glamazdin, Z. Chai, J. J. LeRose, and V. Gorbenko

Subjects
Physics, Nuclear physics, Nuclear reaction, Nuclear and High Energy Physics, Quasielastic scattering, Scattering, Magnetic form factor, Hadron, Momentum transfer, Neutron, Nuclear Experiment, Nucleon
Abstract

A high precision measurement of the transverse spin-dependent asymmetry A_T' in ^3He(e,e') quasielastic scattering was performed in Hall A at Jefferson Lab at values of the squared four-momentum transfer, Q^2, between 0.1 and 0.6 (GeV/c)^2. A_(T') is sensitive to the neutron magnetic form factor, G_M^n . Values of G_M^n at Q^2 = 0.1 and 0.2 (GeV/c)^2, extracted using Faddeev calculations, were reported previously. Here, we report the extraction of G_M^n for the remaining Q^2 values in the range from 0.3 to 0.6 (GeV/c)^2 using a plane-wave impulse approximation calculation. The results are in good agreement with recent precision data from experiments using a deuterium target.

Published
2003
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17. Polarization transfer in the16O(e→,e′p→)15Nreaction

Author

Nilanga Liyanage, Pierre Bertin, Richard Wilson, Branislav Vlahovic, Ronald Ransome, R. Suleiman, E. Cisbani, W. U. Boeglin, J. Gomez, Laird Kramer, E. J. Brash, K. Wijesooriya, D. M. Manley, O. Ravel, J. A. Templon, P. Djawotho, J. Marroncle, J. Domingo, A. Gasparian, A. V. Glamazdin, Gordon D. Cates, K. A. Griffioen, C. Cavata, J. Berthot, B. Frois, A. Soldi, A. J. Sarty, R. I. Pomatsalyuk, Y. Roblin, G. Kumbartzki, R. Roche, T. P. Smith, S. Nanda, C. F. Perdrisat, D. J. Margaziotis, J. Fleniken, T. Terasawa, Vincent Breton, Z. L. Zhou, R. A. Lindgren, J. J. LeRose, Shalev Gilad, C. W. de Jager, Charles Glashausser, V. Gorbenko, K. A. Aniol, M. K. Jones, D. S. Dale, E. A.J.M. Offermann, K. Kino, F. Garibaldi, D. G. Zainea, C. C. Chang, J. S. McCarthy, K. S. Kumar, V. Zeps, A. Serdarevic-Offermann, S. van Verst, Pavel Sorokin, R. W. Lourie, A. Deur, Jian-Ping Chen, Ch. Hyde-Wright, M. Khayat, M. Khandaker, W. Kahl, G. M. Urciuoli, N. d'Hose, Z. Papandreou, Bogdan Wojtsekhowski, G. G. Petratos, Z. E. Meziani, H. Breuer, R. Holmes, B. D. Anderson, G. J. Lolos, M. B. Epstein, Hiroaki Tsubota, F. W. Hersman, R. L.J. van der Meer, L. A. Ewell, Ronald Gilman, K. McCormick, Wolfgang Korsch, L. Cardman, S. Jaminion, Leonid Levchuk, V. A. Punjabi, James J. Kelly, K. Joo, C. R. Howell, P. E. Ulmer, J. W. Watson, S. Kerhoas, J. R. Calarco, S. Frullani, F. T. Baker, P. Vernin, D. Neyret, B. Diederich, T. Saito, G. Rutledge, Mauro Iodice, J. Hines, Larry Weinstein, William Bertozzi, H. Fonvieille, L. Todor, A. Leone, Pete Markowitz, G. Laveissière, R. Madey, Roberto Perrino, R. De Leo, T. P. Gorringe, Paul Souder, Jing Zhao, A. Saha, R. Michaels, G. M. Huber, Justin I. McIntyre, L. Auerbach, M. Liang, G. Quéméner, D. Rowntree, J. Gao, Kevin Fissum, S. Platchkov, J. Martino, J. E. Ducret, T. Pussieux, L. Bimbot, Kazushige Maeda, Seigo Kato, J. M. Finn, J. Mougey, H. Voskanyan, C. Jutier, S. Malov, E. Burtin, M. Holtrop, B. Doyle, P. M. Rutt, David L. Prout, and H. Ueno

Subjects
Physics, Nuclear and High Energy Physics, Mathematics::Probability, Deuterium, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Polarization (waves), 7. Clean energy, 01 natural sciences
Abstract

The first $(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}}\stackrel{\ensuremath{\rightarrow}}{p})$ polarization transfer measurements on a nucleus heavier than deuterium have been carried out at Jefferson Laboratory. Transverse and longitudinal components of the polarization of protons ejected in the reaction ${}^{16}\mathrm{O}(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}}\stackrel{\ensuremath{\rightarrow}}{p})$ were measured in quasielastic perpendicular kinematics at a ${Q}^{2}$ of 0.8 $(\mathrm{GeV}{/c)}^{2}.$ The data are in good agreement with state of the art calculations.

Published
2000
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18. Virtual Compton Scattering and polarizabilities

Author

P.Y. Bertin, Ch. Hyde-Wright, J.E. Ducret, P. Vernin, S. Kerhoas, M. Weiss, D. Lhuillier, P. Merle, S. Derber, J. Van de Wiele, Daniela Rohe, O. Ravel, Vincent Breton, M. Ding, G. Tamas, J. Mougey, D. Baumann, C. Marchand, A. Wagner, N. D'Hose, K. W. Krygier, Th. Walcher, P. Jennewein, N. Degrande, M. Kahrau, Th. Pospischil, Marc Vanderhaeghen, U. Müller, H. Holvoet, B. Lannoy, P. Bartsch, W.U. Boeglin, P.A.M. Guichon, M. O. Distler, I. Ewald, Y. Roblin, J. Martino, G. Quemener, H. Schmieden, J. Berthot, Michael Tytgat, R. Van de Vyver, G. De Meyer, J.M. Friedrich, D. Marchand, Harald Merkel, G. Rosner, H. Fonvieille, R. Neuhausen, L. Van Hoorebeke, Dirk Ryckbosch, R. Böhm, A. Liesenfeld, J. Marroncle, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), and 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)

Subjects
Electromagnetic field, Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Compton scattering, Measure (physics), Observable, 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nucleon, Nuclear Experiment, Microtron
Abstract

Virtual Compton Scattering (VCS) off the proton below pion threshold allows access to generalized polarizabilities of the proton. These observables measure the response of the nucleon to low energy electromagnetic field perturbations. This paper presents a comparison with Real Compton Scattering and also results for the first dedicated VCS experiment performed at the Mainz Microtron MAMI with high resolution spectrometers at Q2 = 0.33 GeV2.

Published
1999

19. The first dedicated Virtual Compton Scattering experiment at MAMI

Author

J.M. Friedrich, O. Ravel, A. Wagner, I. Ewald, Ch. Hyde-Wright, M. Kahrau, E. A. J. M. Offermann, P. Sauer, W.U. Boeglin, P. Vernin, A. Liesenfeld, P.A.M. Guichon, J. Martino, R. Edelhoff, G. Rosner, S. Derber, M. Ding, H. Fonvieille, N. d'Hose, M. O. Distler, P.Y. Bertin, Daniela Rohe, R. Neuhausen, G. Tamas, T. Caprano, J.E. Ducret, J. Y. Mougey, D. Baumann, J. Roche, Th. Pospischil, C. Marchand, K. Merle, V. Kunde, M. Korn, Dirk Ryckbosch, R. Böhm, P. Jennewein, K. W. Krygier, P. Merle, B. Lannoy, J. Berthot, G. Quemener, L. Van Hoorebeke, Marc Vanderhaeghen, J. Van de Wiele, Vincent Breton, Michael Tytgat, P. Bartsch, Y. Roblin, R. Van de Vyver, H. Schmieden, R. Geiges, Harald Merkel, H. Kramer, H. Holvoet, G. De Meyer, D. Marchand, Th. Gousset, N. Degrande, Th. Walcher, S. Kerhoas, S. Schardt, D. Lhuillier, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), and 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)

Subjects
Physics, Nuclear and High Energy Physics, Photon, Proton, Spectrometer, 010308 nuclear & particles physics, Momentum transfer, Compton scattering, 01 natural sciences, Nuclear physics, Momentum, Amplitude, 0103 physical sciences, Photon polarization, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, 010306 general physics
Abstract

We measured the absolute cross sections for photon electro-production off the proton, ep to ep gamma , with the high resolution spectrometers at MAMI at momentum transfer q=600 MeV/c and photon polarization epsilon =0.62. We covered the momentum range for the outgoing real photon q'=33/111 MeV/c. From the extracted virtual Compton scattering amplitude we deduce values for two structure functions related to the generalized polarizabilities of the proton.

Published
1999

20. The first Virtual Compton Scattering experiment at MAMI

Author

V. Kunde, Y. Roblin, A. Liesenfeld, P. Sauer, J. Berthot, P. Merle, P.Y. Bertin, J. Martino, Marc Vanderhaeghen, J. Roche, K. Merle, H. Schmieden, J.M. Friedrich, T. Caprano, S. Kerhoas, S. Schardt, R. Böhm, Daniela Rohe, G. Tamas, M. O. Distler, G. Quéméner, R. Van de Vyver, A. Wagner, O. Ravel, Harald Merkel, Th. Pospischil, Th. Gousset, J.E. Ducret, J. Y. Mougey, I. Ewald, N. d'Hose, P. Jennewein, N. Degrande, Th. Walcher, Michael Tytgat, D. Lhuillier, Ch. Hyde-Wright, R. Edelhoff, G. Rosner, G. De Meyer, H. Fonvieille, D. Marchand, P. Vernin, S. Derber, M. Kahrau, H. Kramer, J. Van de Wiele, Vincent Breton, P. Bartsch, W.U. Boeglin, M. Ding, P.A.M. Guichon, H. Holvoet, R. Geiges, C. Marchand, B. Lannoy, L. Van Hoorebeke, K. W. Krygier, Dirk Ryckbosch, R. Neuhausen, M. Korn, 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), 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), De Sanctis E. Bianchi N. Muccifora V., VCS, Chadelas, Michèle, 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
Physics, Nuclear and High Energy Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Proton, Spectrometer, 010308 nuclear & particles physics, Compton scattering, Virtual particle, Observable, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, 010306 general physics, Microtron
Abstract

Virtual Compton scattering, i.e. the exclusive reaction γ ∗ p → γ′p′ with γ ∗ denoting a virtual photon, provides new insights on the internal structure of the proton. Below π 0 production threshold, this experiment measures the generalized polarizabilities of the proton as defined by Guichon et al [1], [2] and Drechsel et al [3]. These new electromagnetic observables, functions of Q 2 , enlarge the concept of electric (α0 and magnetic (β) polarizabilities in Real Compton Scattering ( Q 2 =0) [4]. The first VCS experiment [5] of this kind was measured at the three spectrometer facility at the Mainz Microtron MAMI for Q 2 =0.33 GeV 2 and we present in this paper the preliminary results.

Published
1999

21. Measurements of the proton and deuteron spin structure functionsg1andg2

Author

Timothy Chupp, R. Gearhart, S.St. Lorant, Koji Abe, D. Kawall, P. Raines, C. Y. Prescott, H. Fonvieille, F. S. Dietrich, L. S. Rochester, J. P. Chen, D. Crabb, M. Kuriki, Ch. Hyde-Wright, T. Averett, A. Rijllart, J. Clendenin, J. Morgenstern, Donal Day, L. C. Smith, R. C. Minehart, R. Erbacher, Z. E. Meziani, F. Staley, G. Court, B. Zihlmann, R. Prepost, Emil Frlez, J. R. Johnson, P. Grenier, Timothy B. Smith, Y. Roblin, R. Antonov, R. M. Lombard-Nelsen, C. C. Young, Avraham Klein, R. Pitthan, T. J. Liu, Dinko Pocanic, J. S. McCarthy, R. A. Lindgren, F. Suekane, G. G. Petratos, Ingo Sick, J. Fellbaum, J. Button-Shafer, H. Borel, K. A. Griffioen, S. E. Kuhn, K. Witte, John C. Mitchell, A. Feltham, E. W. Hughes, D. Walz, F.R. Wesselmann, P. E. Bosted, Z. M. Szalata, D. Garvey, J. M. Bauer, Y. Terrien, T. L. Usher, B. Raue, S. Hoibraten, Pascal Steiner, D. Zimmermann, Vincent Breton, H. R. Band, O. Rondon, H. Tang, K. P. Coulter, S. E. Rock, J. Gomez, R. G. Arnold, L. M. Stuart, T. Maruyama, D. Reyna, J. A. Dunne, X.K. Maruyama, C. Comptour, M. Daoudi, T. Akagi, M. Spengos, H. Yuta, P.L. Anthony, W. Meyer, G. H. Zapalac, H. Dutz, J. Marroncle, B. Youngman, and James L. White

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, Deuterium, Full data, Zero (complex analysis), Resonance, Spin structure, Beam energy
Abstract

Measurements are reported of the proton and deuteron spin structure functions ${g}_{1}^{p}$ and ${g}_{1}^{d}$ at beam energies of 29.1, 16.2, and 9.7 GeV, and ${g}_{2}^{p}$ and ${g}_{2}^{d}$ at a beam energy of 29.1 GeV. The integrals ${\ensuremath{\Gamma}}_{p}={\ensuremath{\int}}_{0}^{1}{g}_{1}^{p}{(x,Q}^{2})dx$ and ${\ensuremath{\Gamma}}_{d}={\ensuremath{\int}}_{0}^{1}{g}_{1}^{d}{(x,Q}^{2})dx$ were evaluated at fixed ${Q}^{2}=3(\mathrm{GeV}{/c)}^{2}$ using the full data set to yield ${\ensuremath{\Gamma}}_{p}=0.132\ifmmode\pm\else\textpm\fi{}0.003(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.009(\mathrm{syst})$ and ${\ensuremath{\Gamma}}_{d}=0.047\ifmmode\pm\else\textpm\fi{}0.003\ifmmode\pm\else\textpm\fi{}0.006.$ The ${Q}^{2}$ dependence of the ratio ${g}_{1}{/F}_{1}$ was studied and found to be small for ${Q}^{2}g1(\mathrm{GeV}{/c)}^{2}.$ Within experimental precision the ${g}_{2}$ data are well described by the twist-2 contribution, ${g}_{2}^{\mathrm{WW}}.$ Twist-3 matrix elements were extracted and compared to theoretical predictions. The asymmetry ${A}_{2}$ was measured and found to be significantly smaller than the positivity limit $\sqrt{R}$ for both proton and deuteron targets. ${A}_{2}^{p}$ is found to be positive and inconsistent with zero. Measurements of ${g}_{1}$ in the resonance region show strong variations with $x$ and ${Q}^{2},$ consistent with resonant amplitudes extracted from unpolarized data. These data allow us to study the ${Q}^{2}$ dependence of the integrals ${\ensuremath{\Gamma}}_{p}$ and ${\ensuremath{\Gamma}}_{n}$ below the scaling region.

Published
1998
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22. Application of neural networks and cellular automata to interpretation of calorimeter data

Author

F. Tamin, Y. Roblin, H. Fonvieille, C. Guicheney, P. Grenier, Vincent Breton, J. Jousset, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), and 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)

Subjects
Physics, Nuclear and High Energy Physics, Interpretation (logic), Calorimeter (particle physics), Artificial neural network, 010308 nuclear & particles physics, 01 natural sciences, Cellular automaton, Identification (information), Parallel processing (DSP implementation), Cellular neural network, 0103 physical sciences, Cluster (physics), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Instrumentation, Algorithm
Abstract

Computing techniques based on parallel processing have been used to treat the information from the electromagnetic calorimeters in SLAC experiments E142/E143. Cluster finding and separation of overlapping showers are performed by a cellular automaton, pion and electron identification is done by using a multilayered neural network. Both applications are presented and their resulting performances are shown to be improved compared to more standard approaches.

Published
1995

23. Measurement of the spin structure function g$_{1}^{n}$ of the neutron

Author

Y. Roblin

Subjects
Physics, Nuclear and High Energy Physics, Neutron magnetic moment, Spin polarization, Dynamic structure factor, Neutron stimulated emission computed tomography, Neutron, Atomic physics, Neutron scattering, Small-angle neutron scattering, Atomic and Molecular Physics, and Optics, Particle Physics - Experiment, Neutron spin echo
Published
1994

24. MEMUS – A large solid angle detector for ELFE

Author

A.V. Stavinsky, G. Audit, T. Pussieux, P HoffmannRothe, Y. Roblin, R. Frascaria, C. Cavata, Thierry Auger, G. Fournier, M. Morlet, A. Pastor, T. Russew, C. Marchand, J Vandewiele, A. Boudard, L. H. Rosier, A.V. Vlassov, H. Fonvieille, E.A. Doroshkevitch, E. Voutier, J. Marroncle, J. Berthot, Vincent Breton, F. Merchez, P.Y. Bertin, and P. Vernin

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Hydrogen, Spectrometer, Physics::Instrumentation and Detectors, business.industry, Detector, Solid angle, chemistry.chemical_element, Modular design, Nuclear physics, chemistry, High Energy Physics::Experiment, Nuclear Experiment, business, Nucleon, Instrumentation
Abstract

Multiparticle Electroproduction Modular Upgradable Spectrometer (MEMUS) is a large acceptance detector intended to run on the ELFE machine at a luminosity of 10 36 cm −2 s −1 per nucleon with a hydrogen target. The detector is designed to study reactions with multiparticle final states. We present a brief description of the overall detector design and of the ongoing research program on the determination of the adequate characteristics of the different detector components.

Published
1998
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25. Beam energy measurement at TJNAF at a level of ΔE/E=10−4 by determination of the p(e,e’p) kinematics on hydrogen

Author

O. Ravel, J. Berthot, S Kerhoas, D. Lambert, Y. Roblin, G. Savinel, M. Crouau, G. Fournier, P.Y. Bertin, J.C. Lugol, M. Brossard, F. Daudon, and J Maroncle

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Silicon, Hydrogen, Physics::Instrumentation and Detectors, Detector, chemistry.chemical_element, Kinematics, Electron, chemistry, Physics::Accelerator Physics, Atomic physics, Instrumentation, Beam energy, Beam (structure)
Abstract

A beam energy measurement based on p(e,e’p) elastic scattering kinematics is presented. It uses two determinations in coincidences, symmetrically about the beam of the (e,e’p) kinematics. The scattered electron angles and the recoil proton angles are measured in silicon strip detectors. The goal is to determine the beam energy between 0.5 and 6 GeV with an accuracy of Δ E / E =10 −4 .

Published
1998
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26. Correction to 'Shower Counters for SLAG Experiments E142/E143' [Erratum]

Author

Y. Roblin, H. Borel, C. Comptour, F. Staley, B. Paul, M. Crouau, H. Fonvielle, Y. Terrien, J.C. Logol, J.P. Mouly, J. LeMeur, Vincent Breton, R. Lombard, R. A. Gearhart, J. Marroncle, J. Morgenstern, G. Savinel, and P. Grenier

Subjects
Nuclear and High Energy Physics, Photomultiplier, Materials science, Nuclear engineering, Linear predictive coding, Particle detector, Linear particle accelerator, Shower, Nuclear Energy and Engineering, Electronic engineering, Electrical and Electronic Engineering, Slag (welding), Spectroscopy, Computer Automated Measurement and Control
Published
1995
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27. Requirements for a large solid angle detector for ELFE

Author

G. Audit, H. Fonvieille, C. Marchand, J. Marroncle, M. Morlet, Thierry Auger, A. Boudard, C. Cavata, E. Voutier, Vincent Breton, T. Russew, L. H. Rosier, T. Pussieux, Y. Roblin, bibliotheque, LPSC, 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), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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), 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 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)

Subjects
Set (abstract data type), Nuclear physics, Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Hadron, Detector, Solid angle, High Energy Physics::Experiment, Session (computer science), [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Abstract

We present detailed simulations of the MEMUS detector [1] response to both electromagnetic and hadronic background, as well as to a representative set of proposed experiments at ELFE. The aim of this study is to check the adequation of the detector to the requirements of the experiments involving exclusive channels. This study is far from complete, but preliminary design refinements can be inferred. The technical details for the detector components can be found in the write-up of the detector session[2].

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