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5. Puzzle with the precession of the neutron spin

Author

Sulkosky, V., Peng, C., Chen, J.-P., Deur, A., Abrahamyan, S., Aniol, K.A., Armstrong, D.S., Averett, T., Bailey, S.L., Beck, A., Bertin, P., Butaru, F., Boeglin, W., Camsonne, A., Cates, G.D., Chang, C.C., Choi, Seonho, Chudakov, E., Coman, L., Cornejo, J.C., Craver, B., Cusanno, F., De Leo, R., De Jager, C.W., Denton, J.D., Dhamija, S., Feuerbach, R., Finn, J.M., Frullani, S., Fuoti, K., Gao, H., Garibaldi, F., Gayou, O., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Hansen, J.-O., Hayes, D., Hersman, B., Higinbotham, D.W., Holmstrom, T., Humensky, T.B., Hyde, C.E., Ibrahim, H., Iodice, M., Jiang, X., Kaufman, L.J., Kelleher, A., Keister, K.E., Kim, W., Kolarkar, A., Kolb, N., Korsch, W., Kramer, K., Kumbartzki, G., Lagamba, L., Laine, V., Laveissiere, G., LeRose, J.J., Lhuillier, D., Lindgren, R., Liyanage, N., Lu, H.-J., Ma, B., Margaziotis, D.J., Markowitz, P., McCormick, K., Meziane, M., Meziani, Z.-E., Michaels, R., Moffit, B., Monaghan, P., Nanda, S., Niedziela, J., Niskin, M., Pandolfi, R., Paschke, K.D., Potokar, M., Puckett, A., Punjabi, V.A., Qiang, Y., Ransome, R., Reitz, B., Roche, R., Saha, A., Shabetai, Alexandre, Sirca, S., Singh, J.T., Slifer, K., Snyder, R., Solvignon, P., Stringer, R., Subedi, R., Tobias, W.A., Ton, N., Ulmer, P.E., Urciuoli, G.M., Vacheret, A., Voutier, E., Wang, K., Wan, L., Wojtsekhowski, B., Woo, S., Yao, H., Yuan, J., Zhan, X., Zheng, X., Zhu, L., HEP, INSPIRE, 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), 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, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), and E97-110

Subjects
spin: precession, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], nucleon: structure, strong interaction, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nonperturbative, spin: polarizability, momentum transfer: low, electromagnetic field, effective field theory: chiral, Nuclear Experiment, n: spin, experimental results, Jefferson Lab
Abstract

Understanding the structure of the nucleon (proton and neutron) is a critical problem in physics. Especially challenging is to understand the spin structure when the Strong Interaction becomes truly strong. At energy scales below the nucleon mass (~1 GeV), the intense interactions of the quarks and gluons inside the nucleon makes them highly correlated. Their coherent behavior causes the emergence of effective hadronic degrees of freedom (hadrons are composite particles made of quarks and gluons) which are necessary to understand the nucleon properties. Theoretically studying this subject requires approaches employing non-perturbative techniques or using hadronic degrees of freedom, e.g. chiral effective field theory (chiEFT). Here, we present measurements sensitive to the neutron's spin precession under electromagnetic fields. The observables, the generalized spin-polarizabilities delta_LT and gamma_0, which quantify the nucleon spin's precession, were measured at very low energy-momentum transfer squared Q^2 corresponding to probing distances of the size of the nucleon. Our Q^2 values match the domain where chiEFT calculations are expected to be applicable. The calculations have been conducted to high degrees of sophistication, including that of the so-called "gold-plated" observable, delta_LT. Surprisingly however, our data show a strong discrepancy with the chiEFT calculations. This presents a challenge to the current description of the neutron's spin properties.

Published
2021

6. Measurement of the 3He spin-structure functions and of neutron (3He) spin-dependent sum rules at 0.035 ≤ Q2 ≤ 0.24 GeV2

Author

Sulkosky, V., Singh, J.T., Peng, C., Chen, J.-P., Deur, A., Abrahamyan, S., Aniol, K.A., Armstrong, D.S., Averett, T., Bailey, S.L., Beck, A., Bertin, P., Butaru, F., Boeglin, W., Camsonne, A., Cates, G.D., Chang, C.C., Choi, Seonho, Chudakov, E., Coman, L., Cornejo, J.C., Craver, B., Cusanno, F., De Leo, R., de Jager, C.W., Denton, J.D., Dhamija, S., Feuerbach, R., Finn, J.M., Frullani, S., Fuoti, K., Gao, H., Garibaldi, F., Gayou, O., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Hansen, J.-O., Hayes, D., Hersman, B., Higinbotham, D.W., Holmstrom, T., Humensky, T.B., Hyde, C.E., Ibrahim, H., Iodice, M., Jiang, X., Kaufman, L.J., Kelleher, A., Keister, K.E., Kim, W., Kolarkar, A., Kolb, N., Korsch, W., Kramer, K., Kumbartzki, G., Lagamba, L., Lainé, V., Laveissiere, G., Lerose, J.J., Lhuillier, D., Lindgren, R., Liyanage, N., Lu, H.-J., Ma, B., Margaziotis, D.J., Markowitz, P., McCormick, K., Meziane, M., Meziani, Z.-E., Michaels, R., Moffit, B., Monaghan, P., Nanda, S., Niedziela, J., Niskin, M., Pandolfi, R., Paschke, K.D., Potokar, M., Puckett, A.J.R., Punjabi, V.A., Qiang, Y., Ransome, R., Reitz, B., Roché, R., Saha, A., Shabetai, A., Širca, S., Slifer, K., Snyder, R., Solvignon, P., Stringer, R., Subedi, R., Tobias, W.A., Ton, N., Ulmer, P.E., Urciuoli, G.M., Vacheret, A., Voutier, E., Wang, K., Wan, L., Wojtsekhowski, B., Woo, S., Yao, H., Yuan, J., Zhan, X., Zheng, X., and Zhu, L.

Published
2020
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7. Measurement of the He spin-structure functions and of neutron ( He) spin-dependent sum rules at 0.035 ≤ ≤ 0.24 GeV

Author

Sulkosky, V., Singh, J.T., Peng, C., Chen, J.P., Deur, A., Abrahamyan, S., Aniol, K.A., Armstrong, D.S., Averett, T., Bailey, S.L., Beck, A., Bertin, P., Butaru, F., Boeglin, W., Camsonne, A., Cates, G.D., Chang, C.C., Choi, Seonho, Chudakov, E., Coman, L., Cornejo, J.C., Craver, B., Cusanno, F., De Leo, R., de Jager, C.W., Denton, J.D., Dhamija, S., Feuerbach, R., Finn, J.M., Frullani, S., Fuoti, K., Gao, H., Garibaldi, F., Gayou, O., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Hansen, J.O., Hayes, D., Hersman, B., Higinbotham, D.W., Holmstrom, T., Humensky, T.B., Hyde, C.E., Ibrahim, H., Iodice, M., Jiang, X., Kaufman, L.J., Kelleher, A., Keister, K.E., Kim, W., Kolarkar, A., Kolb, N., Korsch, W., Kramer, K., Kumbartzki, G., Lagamba, L., Lainé, V., Laveissiere, G., Lerose, J.J., Lhuillier, D., Lindgren, R., Liyanage, N., Lu, H.J., Ma, B., Margaziotis, D.J., Markowitz, P., McCormick, K., Meziane, M., Meziani, Z.E., Michaels, R., Moffit, B., Monaghan, P., Nanda, S., Niedziela, J., Niskin, M., Pandolfi, R., Paschke, K.D., Potokar, M., Puckett, A.J.R., Punjabi, V.A., Qiang, Y., Ransome, R., Reitz, B., Roché, R., Saha, A., Shabetai, A., Širca, S., Slifer, K., Snyder, R., Solvignon, P., Stringer, R., Subedi, R., Tobias, W.A., Ton, N., Ulmer, P.E., Urciuoli, G.M., Vacheret, A., Voutier, E., Wang, K., Wan, L., Wojtsekhowski, B., Woo, S., Yao, H., Yuan, J., Zhan, X., Zheng, X., and Zhu, L.

Abstract

The spin-structure functions g1 and g2, and the spin-dependent partial cross-section σTT have been extracted from the polarized cross-sections differences, Δσ∥(ν,Q2) and Δσ⊥(ν,Q2) measured for the He3→(e→,e′)X reaction, in the E97-110 experiment at Jefferson Lab. Polarized electrons with energies from 1.147 to 4.404 GeV were scattered at angles of 6∘ and 9∘ from a longitudinally or transversely polarized $^{3}$He target. The data cover the kinematic regions of the quasi-elastic, resonance production and beyond. From the extracted spin-structure functions, the first moments Γ1‾(Q2), Γ2(Q2) and ITT(Q2) are evaluated with high precision for the neutron in the Q2 range from 0.035 to 0.24GeV2. The comparison of the data and the chiral effective field theory predictions reveals the importance of proper treatment of the Δ degree of freedom for spin observables.

Published
2020

9. Basic instrumentation for Hall A at Jefferson Lab

Author

Alcorn, J., Anderson, B.D., Aniol, K.A., Annand, J.R.M., Auerbach, L., Arrington, J., Averett, T., Baker, F.T., Baylac, M., Beise, E.J., Berthot, J., Bertin, P.Y., Bertozzi, W., Bimbot, L., Black, T., Boeglin, W.U., Boykin, D.V., Brash, E.J., Breton, V., Breuer, H., Brindza, P., Brown, D., Burtin, E., Calarco, J.R., Cardman, L.S., Carr, R., Cates, G.D., Cavata, C., Chai, Z., Chang, C.C., Chant, N.S., Chen, J.-P., Choi, S., Chudakov, E., Churchwell, S., Coman, M., Cisbani, E., Colilli, S., Colombel, N., Crateri, R., Dale, D.S., Degrande, N., de Jager, C.W., De Leo, R., Deur, A., Dezern, G., Diederich, B., Dieterich, S., di Salvo, R., Djawotho, P., Domingo, J., Ducret, J.-E., Dutta, D., Egiyan, K., Epstein, M.B., Escoffier, S., Esp, S., Ewell, L.A., Finn, J.M., Fissum, K.G., Folts, E., Fonvieille, H., Frois, B., Frullani, S., Gao, H., Gao, J., Garibaldi, F., Gasparian, A., Gavalya, A., Gayou, O., Gilad, S., Gilman, R., Giuliani, F., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Gorringe, T., Gricia, M., Griffioen, K., Hamilton, D., Hansen, J.-O., Hersman, F.W., Higinbotham, D.W., Holmes, R., Holmgren, H., Holtrop, M., d'Hose, N., Hovhannisyan, E., Howell, C., Huber, G.M., Hughes, E., Hyde-Wright, C.E., Ibrahim, H., Incerti, S., Iodice, M., Iommi, R., Ireland, D., Jaminion, S., Jardillier, J., Jensen, S., Jiang, X., Jones, C.E., Jones, M.K., Joo, K., Jutier, C., Kahl, W., Kato, S., Katramatou, A.T., Kelly, J.J., Kerhoas, S., Ketikyan, A., Khandaker, M., Khayat, M., Kino, K., Kominis, I., Korsch, W., Kox, S., Kramer, K., Kumar, K.S., Kumbartzki, G., Kuss, M., Lagamba, L., Laveissière, G., Leone, A., LeRose, J.J., Marie, F., Levchuk, L., Leuschner, M., Lhuillier, D., Liang, M., Livingston, K., Lindgren, R.A., Liyanage, N., Lolos, G.J., Lourie, R.W., Lucentini, M., Madey, R., Maeda, K., Malov, S., Manley, D.M., Margaziotis, D.J., Markowitz, P., Marroncle, J., Martine, J., Mayilyan, S., McCarthy, J.S., McCormick, K., Mclntyre, J., McKeown, R.D., Meekins, D., van der Meer, R.L.J., Meziani, Z.-E., Michaels, R., Milbrath, B., Miller, J.A., Miller, W., Mitchell, J., Mougey, J., Nanda, S., Nathan, A., Neyret, D., Offermann, E.A.J.M., Papandreou, Z., Perdrisat, C.F., Perrino, R., Petratos, G.G., Petrosyan, A., Pierangeli, L., Platchkov, S., Pomatsalyuk, R., Pripstein, D., Prout, D.L., Punjabi, V.A., Pussieux, T., Quéméner, G., Ransomez, R.D., Ravel, O., Reitz, B., Roblin, Y., Roche, R., Roedelbronn, M., Rondon-Aramayo, O.A., Roos, P.G., Rosner, G., Rowntree, D., Rutledge, G.A., Rutt, P.M., Rvachev, M., Sabatavenere, F., Saha, A., Saito, T., Santavenere, F., Sarty, A.J., Schneider, W.J., Segal, J.P., Serdarevic-Offermann, A., Shahinyan, A., Slifer, K., Smith, T.P., Soldi, A., Sorokin, P., Souder, P., Spiegel, S.L., Stevens, M.A., Strauch, S., Suleiman, R., Templon, J.A., Terasawa, T., Todor, L., Tsubota, H., Ueno, H., Ulmer, P.E., Urciuoli, G.M., Van Hoorebeke, L., Van de Vyver, R., van Verst, S., Vernin, P., Vlahovic, B., Voskanyan, H., Voutier, E., Walter, R., Watson, J.W., Watts, D.P., Weinstein, L.B., Wijesooriya, K., Wojtsekhowski, B., Xiang, H., Xiong, F., Xu, W., Zainea, D.G., Zeps, V., Zhao, J., Zheng, X., Zhou, Z.-L., Zhu, L., and Zolnierczuk, P.A.

Published
2004
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10. Probing cold dense nuclear matter

Author

Subedi, R., Shneor, R., Monaghan, P., Anderson, B.D., Aniol, K., Annand, J., Arrington, J., Benaoum, H., Benmokhtar, F., Boeglin, W., Chen, J.-P., Choi, Seonho, Cisbani, E., Craver, B., Frullani, S., Garibaldi, F., Gilad, S., Gilman, R., Glamazdin, O., Hansen, J.-O., Higinbotham, D.W., Holmstrom, T., Ibrahim, H., Igarashi, R., Jager, C.W. de, Jans, E., Jiang, X., Kaufman, L.J., Kelleher, A., Kolarkar, A., Kumbartzki, G., LeRose, J.J., Lindgren, R., Liyanage, N., Margaziotis, D.J., Markowitz, P., Marrone, S., Mazouz, M., Meekins, D., Michaels, R., Moffit, B., Perdrisat, C.F., Piasetzky, E., Potokar, M., Punjabi, V., Qiang, Y., Reinhold, J., Ron, G., Rosner, G., Saha, A., Sawatzky, B., Shahinyan, A., Sirca, S., Slifer, K., Solvignon, P., Sulkosky, V., Urciuoli, G.M., Voutier, E., Watson, J.W., Weinstein, L.B., Wojtsekhowski, B., Wood, S., Zheng, X.-C., and Zhu, L.

Subjects
Scattering (Physics) -- Usage
Published
2008

11. Dispersive Corrections to the Born Approximation in Elastic Electron-Nucleus Scattering in the Intermediate Energy Regime

Author

Guèye, P., Kabir, A.A., Glister, J., Lee, B.W., Gilman, R., Higinbotham, D.W., Piasetzky, E., Ron, G., Sarty, A.J., Strauch, S., Adeyemi, A., Allada, K., Armstrong, W., Arrington, J., Arenhövel, H., Beck, A., Benmokhtar, F., Berman, B.L., Boeglin, W., Brash, E., Camsonne, A., Calarco, J., Chen, J.P., Choi, S., Chudakov, E., Coman, L., Craver, B., Cusanno, F., Dumas, J., Dutta, C., Feuerbach, R., Freyberger, A., Frullani, S., Garibaldi, F., Hansen, J.-O., Holmstrom, T., Hyde, C.E., Ibrahim, H., Ilieva, Y., Jiang, X., Jones, M.K., Katramatou, A.T., Kelleher, A., Khrosinkova, E., Kuchina, E., Kumbartzki, G., LeRose, J.J., Lindgren, R., Markowitz, P., May-Tal Beck, S., Mccullough, E., Meekins, D., Meziane, M., Meziani, Z.-E., Michaels, R., Moffit, B., Norum, B.E., Petratos, G.G., Oh, Y., Olson, M., Paolone, M., Paschke, K., Perdrisat, C.F., Potokar, M., Pomatsalyuk, R., Pomerantz, I., Puckett, A., Punjabi, V., Qian, X., Qiang, Y., Ransome, R.D., Reyhan, M., Roche, J., Rousseau, Y., Sawatzky, B., Schulte, E., Schwamb, M., Shabestari, M., Shahinyan, A., Shneor, R., Širca, S., Slifer, K., Solvignon, P., Song, J., Sparks, R., Subedi, R., Urciuoli, G.M., Wang, K., Wojtsekhowski, B., Yan, X., Yao, H., Zhan, X., Zhu, X., Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), and Jefferson Lab Hall A

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Measurements of elastic electron scattering data within the past decade have highlighted two-photon exchange contributions as a necessary ingredient in theoretical calculations to precisely evaluate hydrogen elastic scattering cross sections. This correction can modify the cross section at the few percent level. In contrast, dispersive effects can cause significantly larger changes from the Born approximation. The purpose of this experiment is to extract the carbon-12 elastic cross section around the first diffraction minimum, where the Born term contributions to the cross section are small to maximize the sensitivity to dispersive effects. The analysis uses the LEDEX data from the high resolution Jefferson Lab Hall A spectrometers to extract the cross sections near the first diffraction minimum of 12C at beam energies of 362 MeV and 685 MeV. The results are in very good agreement with previous world data, although with less precision. The average deviation from a static nuclear charge distribution expected from linear and quadratic fits indicate a 30.6% contribution of dispersive effects to the cross section at 1 GeV. The magnitude of the dispersive effects near the first diffraction minimum of 12C has been confirmed to be large with a strong energy dependence and could account for a large fraction of the magnitude for the observed quenching of the longitudinal nuclear response. These effects could also be important for nuclei radii extracted from parity-violating asymmetries measured near a diffraction minimum., Comment: 14 pages, 10 figures

Published
2018

12. Precision measurements of A1n in the deep inelastic regime

Author

Parno, D.S., Flay, D., Posik, M., Allada, K., Armstrong, W., Averett, T., Benmokhtar, F., Bertozzi, W., Camsonne, A., Canan, M., Cates, G.D., Chen, C., Chen, J.-P., Choi, S., Chudakov, E., Cusanno, F., Dalton, M.M., Deconinck, W., de Jager, C.W., Deng, X., Deur, A., Dutta, C., El Fassi, L., Franklin, G.B., Friend, M., Gao, H., Garibaldi, F., Gilad, S., Gilman, R., Glamazdin, O., Golge, S., Gomez, J., Guo, L., Hansen, O., Higinbotham, D.W., Holmstrom, T., Huang, J., Hyde, C., Ibrahim, H.F., Jiang, X., Jin, G., Katich, J., Kelleher, A., Kolarkar, A., Korsch, W., Kumbartzki, G., LeRose, J.J., Lindgren, R., Liyanage, N., Long, E., Lukhanin, A., Mamyan, V., McNulty, D., Meziani, Z.-E., Michaels, R., Mihovilovič, M., Moffit, B., Muangma, N., Nanda, S., Narayan, A., Nelyubin, V., Norum, B., Nuruzzaman, Oh, Y., Peng, J.C., Qian, X., Qiang, Y., Rakhman, A., Riordan, S., Saha, A., Sawatzky, B., Shabestari, M.H., Shahinyan, A., Širca, S., Solvignon, P., Subedi, R., Sulkosky, V., Tobias, W.A., Troth, W., Wang, D., Wang, Y., Wojtsekhowski, B., Yan, X., Yao, H., Ye, Y., Ye, Z., Yuan, L., Zhan, X., Zhang, Y., Zhang, Y.-W., Zhao, B., and Zheng, X.

Subjects
Nuclear and High Energy Physics
Published
2015
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13. Rosenbluth separation of the $\pi^0$ Electroproduction Cross Section off the Neutron

Author

Mazouz, M., Ahmed, Z., Albataineh, H., Allada, K., Aniol, K.A., Bellini, V., Benali, M., Boeglin, W., Bertin, P., Brossard, M., Camsonne, A., Canan, M., Chandavar, S., Chen, C., Chen, J.P., Defurne, M., de Jager, C.W., de Leo, R., Desnault, C., Deur, A., El Fassi, L., Ent, R., Flay, D., Friend, M., Fuchey, E., Frullani, S., Garibaldi, F., Gaskell, D., Giusa, A., Glamazdin, O., Golge, S., Gomez, J., Hansen, O., Higinbotham, D., Holmstrom, T., Horn, T., Huang, J., Huang, M., Huber, G.M., Hyde, C.E., Iqbal, S., Itard, F., Kang, Ho., Kang, Hy., Kelleher, A., Keppel, C., Koirala, S., Korover, I., Lerose, J.J., Lindgren, R., Long, E., Magne, M., Mammei, J., Margaziotis, D.J., Markowitz, P., Martí Jiménez-Argüello, A., Meddi, F., Meekins, D., Michaels, R., Mihovilovic, M., Muangma, N., Muñoz Camacho, C., Nadel-Turonski, P., Nuruzzaman, N., Paremuzyan, R., Puckett, A., Punjabi, V., Qiang, Y., Rakhman, A., Rashad, M.N.H., Riordan, S., Roche, J., Russo, G., Sabatié, F., Saenboonruang, K., Saha, A., Sawatzky, B., Selvy, L., Shahinyan, A., Sirca, S., Solvignon, P., Sperduto, M.L., Subedi, R., Sulkosky, V., Sutera, C., Tobias, W.A., Urciuoli, G.M., Wang, D., Wojtsekhowski, B., Yao, H., Ye, Z., Zana, L., Zhan, X., Zhang, J., Zhao, B., Zhao, Z., Zheng, X., Zhu, P., Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-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), Jefferson Lab Hall A, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-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), Laboratoire de Physique de Clermont ( LPC ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Clermont Auvergne ( UCA ) -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 ), 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 Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
longitudinal, Nuclear Theory, n: structure function, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], momentum transfer dependence, electron n: scattering, High Energy Physics - Experiment, generalized parton distribution: transversity, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], hard exclusive electroproduction, recoil, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], polarization: transverse, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, mesons, flavor, generalized parton distributions, scattering, deuteron: structure function, +electron+deuteron+pi0%22">electron deuteron --> electron deuteron pi0, electron deuteron: deep inelastic scattering, nucleon: generalized parton distribution, photon: polarization, coherence, pi0: electroproduction, High Energy Physics::Experiment, experimental results
Abstract

We report the first longitudinal/transverse separation of the deeply virtual exclusive $\pi^0$ electroproduction cross section off the neutron and coherent deuteron. The corresponding four structure functions $d\sigma_L/dt$, $d\sigma_T/dt$, $d\sigma_{LT}/dt$ and $d\sigma_{TT}/dt$ 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 $ed \to ed\pi^0$ cross sections are found compatible with the small values expected from theoretical models. The $en \to en\pi^0$ cross sections show a dominance from the response to transversely polarized photons, and are in good agreement with calculations based on the transversity GPDs of the nucleon. By combining these results with previous measurements of $\pi^0$ electroproduction off the proton, we present a flavor decomposition of the $u$ and $d$ quark contributions to the cross section., Comment: 6 pages, 6 figures, Submitted to Phys. Rev. Lett

Published
2017

14. First measurement of unpolarized semi-inclusive deep-inelastic scattering cross sections from a $^3$He target

Author

Allada, K., Aniol, K., Annand, J.R.M., Averett, T., Benmokhtar, F., Bertozzi, W., Bradshaw, P.C., Bosted, P., Camsonne, A., Canan, M., Cates, G.D., Chen, C., Chen, J.-P., Chen, W., Chirapatpimol, K., Chudakov, E., Cisbani, E., Cornejo, J.C., Cusanno, F., Dalton, M.M., Deconinck, W., de Jager, C.W., de Leo, R., Deng, X., Deur, A., Ding, H., Dolph, P.A.M., Dutta, C., Dutta, D., El Fassi, L., Frullani, S., Gao, H., Garibaldi, F., Gaskell, D., Gilad, S., Gilman, R., Glamazdin, O., Golge, S., Guo, L., Hamilton, D., Hansen, O., Higinbotham, D.W., Holmstrom, T., Huang, J., Huang, M., Ibrahim, H.F., Iodice, M., Jiang, X., Jin, G., Jones, M.K., Katich, J., Kelleher, A., Kim, W., Kolarkar, A., Korsch, W., Lerose, J.J., Li, X., Li, Y., Lindgren, R., Liu, T., Liyanage, N., Long, E., Lu, H.-J., Margaziotis, D.J., Markowitz, P., Marrone, S., Mcnulty, D., Meziani, Z.-E., Michaels, R., Moffit, B., Muñoz Camacho, C., Nanda, S., Narayan, A., Nelyubin, V., Norum, B., Oh, Y., Osipenko, M., Parno, D., Peng, J.-C., Phillips, S.K., Posik, M., Puckett, A.J.R., Qian, X., Qiang, Y., Rakhman, A., Ransome, R., Riordan, S., Saha, A., Sawatzky, B., Schulte, E., Shahinyan, A., Shabestari, M.H., Širca, S., Stepanyan, S., Subedi, R., Sulkosky, V., Tang, L.-G., Tobias, W.A., Urciuoli, G.M., Vilardi, I., Wang, K., Wojtsekhowski, B., Wang, Y., Yan, X., Yao, H., Ye, Y., Ye, Z., Yuan, L., Zhan, X., Zhang, Y.-W., Zhao, B., Zhao, Y.X., Zheng, X., Zhu, L., Zhu, X., Zong, X., Laboratoire de Physique de Clermont ( LPC ), 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 National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ), Jefferson Lab Hall A, Laboratoire de Physique de Clermont (LPC), 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 National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)

Subjects
+electron+pi%2B%22">electron helium --> electron pi+, HRS, helium: target, cross section: ratio, plane wave, HERMES, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], cross section: angular dependence, COMPASS, Sivers function, quantum chromodynamics, electron: beam, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], +electron+pi%22">electron helium --> electron pi, deep inelastic scattering: semi-inclusive reaction, nucleus, parametrization, showers, model: quark parton, pi+: production, kinematics, differential cross section, quark: valence, higher-dimensional, numerical calculations: Monte Carlo, experimental results, Jefferson Lab
Abstract

International audience; 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

15. 3He Spin-Dependent Cross Sections and Sum Rules

Author

Temple University, Yarevan Physics Institute, Thomas Jefferson National Accelerator Facility, LPC IN2P3/CNRS, Universite´ Blaise Pascal, Massachusetts Institute of Technology, University of Regina, Kharkov Institute of Physics and Technology, University of New Hampshire, California Institute of Technology, Kent State University, Rutgers, The State University of New Jersey, Old Dominion University, INFN, Sezione di Perugia, INFN, Sezione Roma I, M. Smoluchowski Institute of Physics, Jagiellonian University, Syracuse University, Tohoku University, INFN, Sezione Sanita, CEA Saclay,9INFN, Sezione Tor Vergata, Yerevan Physics Institute, Chungnam National University, Princeton University, University of Kentucky, The College of William and Mary, Hampton University, Institut fu¨r Theoretische Physik II, Ruhr Universita¨t Bochum, Temple UniversityINFNSezione di Perugia, INFN, Sezione Sanita1California Institute of Technology, Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, University of Massachusetts-Amherst, CEA Saclay, Institut fu¨r Kernphysik, INFN, Sezione Tor Vergata, Slifer, K, Amarian, M, Auerbach, L, Averett, T, Berthot, J, Bertin, P, Bertozzi, B, Black, T, Brash, E, Brown, D, Burtin, R, Nogga, A, Pace, E, Papandreou, Z, Pavlin, T, Petratos, G.G, Pripstein, D, Prout, D, Ransome, R, Roblin, Y, Rowntree, D, Saha, A, Rvachev, M, Sabatie´, F, Salme´, G, Scopetta, S, Skibinski, R, Souder, P, Saito, T, Strauch, S, Suleiman, R, Takahashi, K, Teijiro, S, Ueno, H, Todor, L, Tsubota, H, Urciuoli, G, Van, der Meer R, Vernin, P, Voskanian, H, Witala, H, Wojtsekhowski, B, Xiong, F, Xu, W, Yang, J.-C, Calarco, J, Zhang, B, Zolnierczuk, P, Cates, G, Chai, Z, Chen, J.-P, Choi, Seonho, Chudakov, E, Ciofi, degli Atti C, Cisbani, E, deJager, C.W, Deur, A, DiSalvo, R, Dietorich, S, Djawotho, P, Finn, M, Fissum, K, Fonvieille, H, Frullani, S, Gao, H, Gao, J, Garibaldi, F, Gasparian, A, Gilad, S, Gilman, R, Glamadin, A, Glashausser, C, Glo¨ckle, W, Golak, J, Goldberg, E, Gomez, J, Gorbenko, V, Hansen, J.-O, Hersman, B, Holmes, R, Huber, G.M, Hughes, E, Humensky, B, Incerti, S, Iodice, M, Jensen, S, Jiang, X, Jones, C, Jones, G, Jones, M, Jutier, C, Kamada, H, Ketikyan, A, Kominis, I, Korsch, W, Kramer, K, Kumae, K, Kumbartzki, G, Kuss, M, Lakuriqi, E, Laveissier, G, Lerose, J.J, Liang, M, Liyanage, N, Lolos, G, Malov, S, Marroncle, J, McCormick, K, McKeown, R.D, Meziani, Z.-E, Michaels, R, Mitchell, J, Temple University, Yarevan Physics Institute, Thomas Jefferson National Accelerator Facility, LPC IN2P3/CNRS, Universite´ Blaise Pascal, Massachusetts Institute of Technology, University of Regina, Kharkov Institute of Physics and Technology, University of New Hampshire, California Institute of Technology, Kent State University, Rutgers, The State University of New Jersey, Old Dominion University, INFN, Sezione di Perugia, INFN, Sezione Roma I, M. Smoluchowski Institute of Physics, Jagiellonian University, Syracuse University, Tohoku University, INFN, Sezione Sanita, CEA Saclay,9INFN, Sezione Tor Vergata, Yerevan Physics Institute, Chungnam National University, Princeton University, University of Kentucky, The College of William and Mary, Hampton University, Institut fu¨r Theoretische Physik II, Ruhr Universita¨t Bochum, Temple UniversityINFNSezione di Perugia, INFN, Sezione Sanita1California Institute of Technology, Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, University of Massachusetts-Amherst, CEA Saclay, Institut fu¨r Kernphysik, INFN, Sezione Tor Vergata, Slifer, K, Amarian, M, Auerbach, L, Averett, T, Berthot, J, Bertin, P, Bertozzi, B, Black, T, Brash, E, Brown, D, Burtin, R, Nogga, A, Pace, E, Papandreou, Z, Pavlin, T, Petratos, G.G, Pripstein, D, Prout, D, Ransome, R, Roblin, Y, Rowntree, D, Saha, A, Rvachev, M, Sabatie´, F, Salme´, G, Scopetta, S, Skibinski, R, Souder, P, Saito, T, Strauch, S, Suleiman, R, Takahashi, K, Teijiro, S, Ueno, H, Todor, L, Tsubota, H, Urciuoli, G, Van, der Meer R, Vernin, P, Voskanian, H, Witala, H, Wojtsekhowski, B, Xiong, F, Xu, W, Yang, J.-C, Calarco, J, Zhang, B, Zolnierczuk, P, Cates, G, Chai, Z, Chen, J.-P, Choi, Seonho, Chudakov, E, Ciofi, degli Atti C, Cisbani, E, deJager, C.W, Deur, A, DiSalvo, R, Dietorich, S, Djawotho, P, Finn, M, Fissum, K, Fonvieille, H, Frullani, S, Gao, H, Gao, J, Garibaldi, F, Gasparian, A, Gilad, S, Gilman, R, Glamadin, A, Glashausser, C, Glo¨ckle, W, Golak, J, Goldberg, E, Gomez, J, Gorbenko, V, Hansen, J.-O, Hersman, B, Holmes, R, Huber, G.M, Hughes, E, Humensky, B, Incerti, S, Iodice, M, Jensen, S, Jiang, X, Jones, C, Jones, G, Jones, M, Jutier, C, Kamada, H, Ketikyan, A, Kominis, I, Korsch, W, Kramer, K, Kumae, K, Kumbartzki, G, Kuss, M, Lakuriqi, E, Laveissier, G, Lerose, J.J, Liang, M, Liyanage, N, Lolos, G, Malov, S, Marroncle, J, McCormick, K, McKeown, R.D, Meziani, Z.-E, Michaels, R, and Mitchell, J

Abstract

type:Journal Article, We present a measurement of the spin-dependent cross sections for the (3)(He) over right arrow((e) over right arrow ,e')X reaction in the quasielastic and resonance regions at a four-momentum transfer 0.1 <= Q(2)<= 0.9 GeV2. The spin-structure functions have been extracted and used to evaluate the nuclear Burkhardt-Cottingham and extended Gerasimov-Drell-Hearn sum rules for the first time. The data are also compared to an impulse approximation calculation and an exact three-body Faddeev calculation in the quasielastic region., source:https://doi.org/10.1103/PhysRevLett.101.022303, source:http://www.aps.org

Published
2017

16. Exclusive neutral pion electroproduction in the deeply virtual regime

Author

Fuchey, E., Camsonne, A., Munoz Camacho, C., Mazouz, M., Gavalian, G., Kuchina, E., Amarian, M., A. Aniol, K., Beaumel, M., Benaoum, H., Bertin, P.Y., Brossard, M., Canan, M., Chen, J.-P., Chudakov, E., Craver, B., Cusanno, F., De Jager, C.W., Deur, A., Ferdi, C., Feuerbach, R., Fieschi, J.-M., Frullani, S., Garcon, M., Garibaldi, F., Gayou, O., Gilman, R., Gomez, J., Gueye, P., Guichon, P.A.M., Guillon, B., Hansen, O., Hayes, D., Higinbotham, D.W., Holmstrom, T., Hyde, C. E., Ibrahim, H., Igarashi, R., Itard, F., Jiang, X., Jo, H.S., Kaufman, L.J., Kelleher, A., Kolarkar, A., Kumbartzki, G., Laveissiere, G., LeRose, J.J., Lindgren, R., Liyanage, N., Lu, H.-J., Margaziotis, D.J., Meziani, Z.-E., McCormick, K., Michaels, R., Michel, B., Moffit, B., Monaghan, P., Nanda, S., Nelyubin, V., Potokar, M., Qiang, Y., Ransome, R.D., Réal, J.S., Reitz, B., Roblin, Y., Roche, J., Sabatie, F., Saha, A., Sirca, S., Slifer, K., Solvignon, P., Subedi, R., Sulkosky, V., Ulmer, P.E., Voutier, E., Wang, K., Weinstein, L.B., Wojtsekhowski, B., Zheng, X., Zhu, L., 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), 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), 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), DVCS, HALL A, 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), 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, Particle physics, Meson, 010308 nuclear & particles physics, Momentum transfer, FOS: Physical sciences, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Inelastic scattering, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Tensor, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Boson
Abstract

We present measurements of the ep->ep pi^0 cross section extracted at two values of four-momentum transfer Q^2=1.9 GeV^2 and Q^2=2.3 GeV^2 at Jefferson Lab Hall A. The kinematic range allows to study the evolution of the extracted hadronic tensor as a function of Q^2 and W. Results will be confronted with Regge inspired calculations and GPD predictions. An intepretation of our data within the framework of semi-inclusive deep inelastic scattering has also been attempted.

Published
2011

17. High-precision measurement of the proton elastic form factor ratio [formula omitted] at low [formula omitted]

Author

Zhan, X., Allada, K., Armstrong, D.S., Arrington, J., Bertozzi, W., Boeglin, W., Chen, J.-P., Chirapatpimol, K., Choi, S., Chudakov, E., Cisbani, E., Decowski, P., Dutta, C., Frullani, S., Fuchey, E., Garibaldi, F., Gilad, S., Gilman, R., Glister, J., Hafidi, K., Hahn, B., Hansen, J.-O., Higinbotham, D.W., Holmstrom, T., Holt, R.J., Huang, J., Huber, G.M., Itard, F., de Jager, C.W., Jiang, X., Johnson, M., Katich, J., de Leo, R., LeRose, J.J., Lindgren, R., Long, E., Margaziotis, D.J., May-Tal Beck, S., Meekins, D., Michaels, R., Moffit, B., Norum, B.E., Olson, M., Piasetzky, E., Pomerantz, I., Protopopescu, D., Qian, X., Qiang, Y., Rakhman, A., Ransome, R.D., Reimer, P.E., Reinhold, J., Riordan, S., Ron, G., Saha, A., Sarty, A.J., Sawatzky, B., Schulte, E.C., Shabestari, M., Shahinyan, A., Shneor, R., Širca, S., Solvignon, P., Sparveris, N.F., Strauch, S., Subedi, R., Sulkosky, V., Vilardi, I., Wang, Y., Wojtsekhowski, B., Ye, Z., and Zhang, Y.

Published
2011
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18. Polarization observables in deuteron photodisintegration below 360 MeV

Author

Glister, J., Ron, G., Lee, B.W., Gilman, R., Sarty, A.J., Strauch, S., Higinbotham, D.W., Piasetzky, E., Allada, K., Armstrong, W., Arrington, J., Arenhövel, H., Beck, A., Benmokhtar, F., Berman, B.L., Boeglin, W., Brash, E., Camsonne, A., Calarco, J., Chen, J.P., Choi, S., Chudakov, E., Coman, L., Craver, B., Cusanno, F., Dumas, J., Dutta, C., Feuerbach, R., Freyberger, A., Frullani, S., Garibaldi, F., Hansen, J.-O., Holmstrom, T., Hyde, C.E., Ibrahim, H., Ilieva, Y., de Jager, C.W., Jiang, X., Jones, M.K., Kang, Hyekoo, Kelleher, A., Khrosinkova, E., Kuchina, E., Kumbartzki, G., LeRose, J.J., Lindgren, R., Markowitz, P., May-Tal Beck, S., McCullough, E., Meekins, D., Meziane, M., Meziani, Z.-E., Michaels, R., Moffit, B., Norum, B.E., Oh, Y., Olson, M., Paolone, M., Paschke, K., Perdrisat, C.F., Potokar, M., Pomatsalyuk, R., Pomerantz, I., Puckett, A., Punjabi, V., Qian, X., Qiang, Y., Ransome, R.D., Reyhan, M., Roche, J., Rousseau, Y., Saha, A., Sawatzky, B., Schulte, E., Schwamb, M., Shabestari, M., Shahinyan, A., Shneor, R., Širca, S., Slifer, K., Solvignon, P., Song, J., Sparks, R., Subedi, R., Urciuoli, G.M., Wang, K., Wojtsekhowski, B., Yan, X., Yao, H., Zhan, X., and Zhu, X.

Published
2011
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19. Recoil Polarization Measurements for Neutral Pion Electroproduction at $Q^2$=1 (GeV/c)$^2$ Near the $\Delta$ Resonance

Author

Kelly, J.J., Gayou, O., E. Roché, R., Chai, Z., K. Jones, M., J. Sarty, A., Frullani, S., Aniol, K., J. Beise, E., Benmokhtar, F., Bertozzi, W., U. Boeglin, W., Botto, T., J. Brash, E., Breuer, H., Brown, E., Burtin, E., R. Calarco, J., Cavata, C., C. Chang, C., S. Chant, N., Chen, J.-P., Coman, M., Crovelli, D., De Leo, R., Dieterich, S., Escoffier, S., G. Fissum, K., Garde, V., Garibaldi, F., Georgakopoulos, S., Gilad, S., Gilman, R., Glashausser, C., Hansen, J.-O., W. Higinbotham, D., Hotta, A., M. Huber, G., Ibrahim, H., Iodice, M., W. De Jager, C., Jiang, X., Klimenko, A., Kozlov, A., Kumbartzki, G., Kuss, M., Lagamba, L., Laveissière, G., LeRose, J.J., A. Lindgren, R., Liyange, N., J. Lolos, G., W. Lourie, R., J. Margaziotis, D., Marie, F., Markowitz, P., McAleer, S., Meekins, D., Michaels, R., D. Milbrath, B., Mitchell, J., Nappa, J., Neyret, D., F. Perdrisat, C., Potokar, M., A. Punjabi, V., Pussieux, T., D. Ransome, R., G. Roos, P., Rvachev, M., Saha, A., Širca, S., Suleiman, R., Strauch, S., A. Templon, J., Todor, L., E. Ulmer, P., M. Urciuoli, G., B. Weinstein, L., Wijsooriya, K., Wojtsekhowski, B., Zheng, X., Zhu, L., 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), 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 HALL A

Subjects
24.70.+s, 14.20.Gk, 13.60.Le, 13.40.Gp, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

We measured angular distributions of differential cross section, beam analyzing power, and recoil polarization for neutral pion electroproduction at Q^2 = 1.0 (GeV/c)^2 in 10 bins of W across the Delta resonance. A total of 16 independent response functions were extracted, of which 12 were observed for the first time. Comparisons with recent model calculations show that response functions governed by real parts of interference products are determined relatively well near 1.232 GeV, but variations among models is large for response functions governed by imaginary parts and for both increases rapidly with W. We performed a nearly model-independent multipole analysis that adjusts complex multipoles with high partial waves constrained by baseline models. Parabolic fits to the W dependence of the multipole analysis around the Delta mass gives values for SMR = (-6.61 +/- 0.18)% and EMR = (-2.87 +/- 0.19)% that are distinctly larger than those from Legendre analysis of the same data. Similarly, the multipole analysis gives Re(S0+/M1+) = (+7.1 +/- 0.8)% at W=1.232 GeV, consistent with recent models, while the traditional Legendre analysis gives the opposite sign because its truncation errors are quite severe. Finally, using a unitary isobar model (UIM), we find that excitation of the Roper resonance is dominantly longitudinal with S1/2 = (0.05 +/- 0.01) GeV^(-1/2) at Q^2=1. The ReS0+ and ReE0+ multipoles favor pseudovector coupling over pseudoscalar coupling or a recently proposed mixed-coupling scheme, but the UIM does not reproduce the imaginary parts of 0+ multipoles well., Comment: 60 pages, 54 figures

Published
2007

20. Measurements of the Proton Elastic-Form-Factor Ratio µpG $^{p}_{E}$/G $^{p}_{M}$ at Low Momentum Transfer

Author

Ron, G., Glister, J., Lee, B., Allada, K., Armstrong, W., Arrington, J., Beck, A., Benmokhtar, F., L. Berman, B., Boeglin, W., Brash, E., Camsonne, A., Calarco, J., P. Chen, J., Choi, S., Chudakov, E., Coman, L., Craver, B., Cusanno, F., Dumas, J., Dutta, C., Feuerbach, R., Freyberger, A., Frullani, S., Garibaldi, F., Gilman, R., Hansen, O., W. Higinbotham, D., Holmstrom, T., Hyde, C. E., Ibrahim, H., Ilieva, Y., W. De Jager, C., Jiang, X., K. Jones, M., Kang, H., Kelleher, A., Khrosinkova, E., Kuchina, E., Kumbartzki, G., LeRose, J.J., Lindgren, R., Markowitz, P., May-Tal Beck, S., Mccullough, E., Meekins, D., Meziane, M., Meziani, Z.-E., Michaels, R., Moffit, B., E. Norum, B., Oh, Y., Olson, M., Paolone, M., Paschke, K., F. Perdrisat, C., Piasetzky, E., Potokar, M., Pomatsalyuk, R., Pomerantz, I., Puckett, A., Punjabi, V., Qian, X., Qiang, Y., Ransome, R., Reyhan, M., Roche, J., Rousseau, Y., Saha, A., J. Sarty, A., Sawatzky, B., Schulte, E., Shabestari, M., Shahinyan, A., Shneor, R., Širca, S., Slifer, K., Solvignon, P., Song, J., Sparks, R., Subedi, R., Strauch, S., M. Urciuoli, G., Wang, K., Wojtsekhowski, B., Yan, X., Yao, H., Zhan, X., Zhu, X., 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 HALL A

Subjects
14.20.Dh, 13.40.Gp, 24.70.+s, 25.30.Bf, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2007

21. High resolution spectroscopy of $^{12}_\Lambda$ B by electroproduction

Author

Iodice, M., Cusanno, F., Acha, A., Ambrozewicz, P., Aniol, K.A., Baturin, P., Bertin, P.Y., Benaoum, H., Blomqvist, K.I., Boeglin, W.U., Breuer, H., Brindza, P., Bydzovsky, P., Camsonne, A., Chang, C.C., Chen, J.-P., Choi, Seonho, Chudakov, E.A., Cisbani, E., Colilli, S., Coman, L., Craver, B.J., de Cataldo, G., de Jager, C.W., Deleo, R., Deur, A.P., Ferdi, C., Feuerbach, R.J., Folts, E., Fratoni, R., Frullani, S., Garibaldi, F., Gayou, O., Giulani, F., Gomez, J., Gricia, M., Hansen, J.O., Hayes, D., Higinbotham, D.W., Holmstrom, T.K., Hyde, C. E., Ibrahim, H.F., Jiang, X., Kaufman, L.J., Kino, K., Kross, B., Lagamba, L., Lerose, J.J., Lindgren, R.A., Lucentini, M., Margaziotis, D.J., Markowitz, P., Marrone, S., Meziani, Z.E., Mccormick, K., Michaels, R.W., Millener, D.J., Miyoshi, T., Moffit, B., Monaghan, P.A., Moteabbed, M., Munoz Camacho, C., Nanda, S., Nappi, E., Nelyubin, V.V., Norum, B.E., Okasyasu, Y., Paschke, K.D., Perdrisat, C.F., Piasetzky, E., Punjabi, V.A., Qiang, Y., Raue, B., Reimer, P.E., Reinhold, J., Reitz, B., Roche, R.E., Rodriguez, V.M., Saha, A., Santavenere, F., Sarty, A.J., Segal, J., Shahinyan, A., Singh, J., Sirca, S., Snyder, R., Solvignon, P.H., Sotona, M., Subedi, R., Sulkosky, V.A., Suzuki, T., Ueno, H., Ulmer, P.E., Urciuoli, G.M., Veneroni, P., Voutier, E., Wojtsekhowski, B.B., Zheng, X., Zorn, C., 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), 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, 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
21.80.+a, 25.30.Rw, 21.60.Cs, 24.50.+g, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

An experiment measuring electroproduction of hypernuclei has been performed in Hall A at Jefferson Lab on a $^{12}$C target. In order to increase counting rates and provide unambiguous kaon identification two superconducting septum magnets and a Ring Imaging CHerenkov detector (RICH) were added to the Hall A standard equipment. An unprecedented energy resolution of less than 700 keV FWHM has been achieved. Thus, the observed \lam{12}{B} spectrum shows for the first time identifiable strength in the core-excited region between the ground-state {\it s}-wave $\Lambda$ peak and the 11 MeV {\it p}-wave $\Lambda$ peak., Comment: Paper submitted to Physical Review Letters

Published
2007

22. Recoil polarization measurements for neutral pion electroproduction at Q2=1(GeV/c)2 near the Δ resonance

Author

Kelly, J.J. Gayou, O. Roché, R.E. Chai, Z. Jones, M.K. Sarty, A.J. Frullani, S. Aniol, K. Beise, E.J. Benmokhtar, F. Bertozzi, W. Boeglin, W.U. Botto, T. Brash, E.J. Breuer, H. Brown, E. Burtin, E. Calarco, J.R. Cavata, C. Chang, C.C. Chant, N.S. Chen, J.-P. Coman, M. Crovelli, D. De Leo, R. Dieterich, S. Escoffier, S. Fissum, K.G. Garde, V. Garibaldi, F. Georgakopoulos, S. Gilad, S. Gilman, R. Glashausser, C. Hansen, J.-O. Higinbotham, D.W. Hotta, A. Huber, G.M. Ibrahim, H. Iodice, M. De Jager, C.W. Jiang, X. Klimenko, A. Kozlov, A. Kumbartzki, G. Kuss, M. Lagamba, L. Laveissière, G. Lerose, J.J. Lindgren, R.A. Liyange, N. Lolos, G.J. Lourie, R.W. Margaziotis, D.J. Marie, F. Markowitz, P. McAleer, S. Meekins, D. Michaels, R. Milbrath, B.D. Mitchell, J. Nappa, J. Neyret, D. Perdrisat, C.F. Potokar, M. Punjabi, V.A. Pussieux, T. Ransome, R.D. Roos, P.G. Rvachev, M. Saha, A. Širca, S. Suleiman, R. Strauch, S. Templon, J.A. Todor, L. Ulmer, P.E. Urciuoli, G.M. Weinstein, L.B. Wijsooriya, K. Wojtsekhowski, B. Zheng, X. Zhu, L.

Abstract

We measured angular distributions of differential cross section, beam analyzing power, and recoil polarization for neutral pion electroproduction at Q2=1.0(GeV/c)2 in 10 bins of 1.17≤W≤1.35 GeV across the Δ resonance. A total of 16 independent response functions were extracted, of which 12 were observed for the first time. Comparisons with recent model calculations show that response functions governed by real parts of interference products are determined relatively well near the physical mass, W=MΔ1.232 GeV, but the variation among models is large for response functions governed by imaginary parts, and for both types of response functions, the variation increases rapidly with W>MΔ. We performed a multipole analysis that adjusts suitable subsets of π≤2 amplitudes with higher partial waves constrained by baseline models. This analysis provides both real and imaginary parts. The fitted multipole amplitudes are nearly model independent-there is very little sensitivity to the choice of baseline model or truncation scheme. By contrast, truncation errors in the traditional Legendre analysis of N→Δ quadrupole ratios are not negligible. Parabolic fits to the W dependence around MΔ for the multiple analysis gives values for Re(S1+/M1+)=(-6.61±0. 18)% and Re(E1+/M1+)=(-2.87±0.19)% for the pπ0 channel at W=1.232 GeV and Q2=1.0(GeV/c)2 that are distinctly larger than those from the Legendre analysis of the same data. Similarly, the multipole analysis gives Re(S0+/M1+)=(+7.1±0.8)% at W=1.232 GeV, consistent with recent models, while the traditional Legendre analysis gives the opposite sign because its truncation errors are quite severe. © 2007 The American Physical Society.

Published
2007

23. Investigation of proton-proton short-range correlations via the $^{12}$C(e,e'pp) reaction

Author

Shneor, R., Monaghan, P., Subedi, R., D. Anderson, B., Aniol, K., Annand, J., Arrington, J., Benaoum, H., Benmokhtar, F., Bertin, P.Y., Bertozzi, W., Boeglin, W., P. Chen, J., Choi, S., Chudakov, E., Cisbani, E., Craver, B., W. De Jager, C., Feuerbach, R., Frullani, S., Garibaldi, F., Gayou, O., Gilad, S., Gilman, R., Glamazdin, O., Gomez, J., Hansen, O., W. Higinbotham, D., Holmstrom, T., Ibrahim, H., Igarashi, R., Jans, E., Jiang, X., Jiang, Yuchao, Kaufman, L., Kelleher, A., Kolarkar, A., Kuchina, E., Kumbartzki, G., LeRose, J.J., Lindgren, R., Liyanage, N., J. Margaziotis, D., Markowitz, P., Marrone, S., Mazouz, M., Michaels, R., Moffit, B., Nanda, S., F. Perdrisat, C., Piasetzky, E., Potokar, M., Punjabi, V., Qiang, Y., Reinhold, J., Reitz, B., Ron, G., Rosner, G., Saha, A., Sawatzky, B., Shahinyan, A., Sirca, S., Slifer, K., Solvignon, P., Sulkosky, V., Thompson, N., E. Ulmer, P., M. Urciuoli, G., Voutier, E., Wang, K., W. Watson, J., Weinstein, L.B., Wojtsekhowski, B., Wood, S., Yao, H., Zheng, X., Zhu, L., 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), 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, 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
electron-nucleus reactions, 21.30.Fe, 21.60.-n, 24.10.-i, 25.30.-c, nuclei with mass number 6 to 19, Nuclear Theory, FOS: Physical sciences, nuclear forces, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

We investigated simultaneously the 12C(e,e'p) and 12C(e,e'pp) reactions at Q2 = 2 [GeV/c]2, x_B = 1.2, and in an (e,e'p) missing-momentum range from 300 to 600 MeV/c. At these kinematics, with a missing-momentum greater than the Fermi momentum of nucleons in a nucleus and far from the delta excitation, short-range nucleon-nucleon correlations are predicted to dominate the reaction. For(9.5 +/- 2)% of the 12C(e,e'p) events, a recoiling partner proton was observed back-to-back to the 12C(e,e'p) missing momentum vector, an experimental signature of correlations., Comment: 5 pages, 4 figures, submitted to Physical Review Letters

Published
2007

24. Proton elastic form factor ratios to $Q^2$=3.5 GeV$^2$ by polarization transfer

Author

Punjabi, V., Perdrisat, C.F., Aniol, K.A., Baker, F.T., Berthot, J., Bertin, P.Y., Bertozzi, W., Besson, A., Bimbot, L., Boeglin, W.U., Brash, E.J., Brown, D., Calarco, J.R., Cardman, L.S., Chai, Z., Chang, C.-C., Chen, J.-P., Chudakov, E., Churchwell, S., Cisbani, E., Dale, D.S., De Leo, R., Deur, A., Diederich, B., Domingo, J.J., Epstein, M.B., Ewell, L.A., G. Fissum, K., Fleck, A., Fonvieille, H., Frullani, S., Gao, J., Garibaldi, F., Gasparian, A., Gerstner, G., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Green, A., Hansen, J.-O., Howell, C.R., Huber, G.M., Iodice, M., De Jager, C.W., Jaminion, S., Jiang, X., Jones, M.K., Kahl, W., Kelly, J.J., Khayat, M., Kramer, L.H., Kumbartzki, G., Kuss, M., Lakuriki, E., Laveissière, G., LeRose, J.J., Liang, M., Lindgren, R.A., Liyanage, N., Lolos, G.J., Macri, R., Madey, R., Malov, S., Margaziotis, D.J., Markowitz, P., McCormick, K., McIntyre, J.I., Van Der Meer, R.L.J., Michaels, R., Milbrath, B.D., Mougey, J.Y., Nanda, S.K., Offermann, E.A.J.M., Papandreou, Z., Pentchev, L., Petratos, G.G., Piskunov, N.M., Pomatsalyuk, R.I., Prout, D.L., Quéméner, G., Ransome, R.D., Raue, B.A., Roblin, Y., Roche, R., Rutledge, G., Rutt, P.M., Saha, A., Saito, T., Sarty, A.J., Smith, T.P., Sorokin, P., Strauch, S., Suleiman, R., Takahashi, K., Templon, J.A., Todor, L., Ulmer, P.E., Urciuoli, G.M., Vernin, P., Vlahovic, B., Voskanyan, H., Wijesooriya, K., Wojtsekhowski, B.B., Woo, R.J., Xiong, F., Zainea, G.D., Zhou, Z.-L., 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
electron-proton scattering, protons, polarisation in elementary particle interactions, electromagnetic form factors, FOS: Physical sciences, 25.30.Bf, 13.40.Gp, 24.85.+p, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The ratio of the proton elastic electromagnetic form factors, $G_{Ep}/G_{Mp}$, was obtained by measuring $P_{t}$ and $P_{\ell}$, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic $\vec e p \to e\vec p$ ~reaction in the four-momentum transfer squared range of 0.5 to 3.5 GeV$^2$. In the single-photon exchange approximation, the ratio $G_{Ep}/G_{Mp}$ is directly proportional to the ratio $P_t/P_{\ell}$. The simultaneous measurement of $P_{t}$ and $P_{\ell}$ in a polarimeter reduces systematic uncertainties. The results for the ratio $G_{Ep}/G_{Mp}$ show a systematic decrease with increasing $Q^2$, indicating for the first time a definite difference in the distribution of charge and magnetization in the proton. The data have been re-analyzed and systematic uncertainties have become significantly smaller than previously published results., Comment: 31 pages, 29 gfigures, submitted to Phys. Rev. C

Published
2005

25. Quasielastic $^{3}He(e,e'p)^{2}H$ reaction at Q2=1.5 GeV2 for recoil momenta up to 1 GeV/c

Author

Rvachev, M.M., Benmokhtar, F., Penel-Nottaris, E., Aniol, K.A., Bertozzi, W., Boeglin, W.U., Butaru, F., Calarco, J.R., Chai, Z., Chang, C.C., Chen, J.P., Chudakov, E., Cisbani, E., Cochran, A., Cornejo, J., Dieterich, S., Djawotho, P., Duran, W., Epstein, M.B., Finn, J.M., Fissum, K.G., Frahi-Amroun, A., Frullani, S., Furget, C., Garibaldi, F., Gayou, O., Gilad, S., Gilman, R., Glashausser, C., Hansen, J.O., Higinbotham, D.W., Hotta, A., Hu, B., Iodice, M., Iomni, R., De Jager, C.W., Jiang, X., Jones, M.K., Kelly, J.J., Kox, S., Kuss, M., Laget, J.M., De Leo, R., LeRose, J.J., Liatard, E., Lindgren, R., Liyanage, N., Lourie, R.W., Malov, S., J. Margaziotis, D., Markowitz, P., Merchez, F., Michaels, R., Mitchell, J., Mougey, J., Perdrisat, C.F., Punjabi, V.A., Quéméner, G., Ransome, R.D., Réal, J.S., Roché, R., Sabatié, F., Saha, A., Simon, D., Strauch, S., Suleiman, R., Tamae, T., Templon, J.A., Tieulent, R., Ueno, H., Ulmer, P.E., Urciuoli, G.M., Voutier, E., Wijesooriya, K., Wojtsekhowski, B., 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), and HALL A

Subjects
electron-nucleus reactions, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, nuclei with mass number 1 to 5, 21.45.+v, 25.30.Dh, 27.10.+h
Abstract

We have studied the quasielastic $^{3}He(e,e'p)^{2}H$ reaction in perpendicular coplanar kinematics, with the energy and the momentum transferred by the electron fixed at 840 MeV and 1502 MeV/c, respectively. The $^{3}He(e,e'p)^{2}H$ cross section was measured for missing momenta up to 1000 MeV/c, while the ATL asymmetry was extracted for missing momenta up to 660 MeV/c. For missing momenta up to 150 MeV/c, the cross section is described by variational calculations using modern 3He wave functions. For missing momenta from 150 to 750 MeV/c, strong final-state interaction effects are observed. Near 1000 MeV/c, the experimental cross section is more than an order of magnitude larger than predicted by available theories. The ATL asymmetry displays characteristic features of broken factorization with a structure that is similar to that generated by available models.

Published
2005

26. Hard photodisintegration of a proton pair

Author

Pomerantz, I., Bubis, N., Allada, K., Beck, A., Beck, S., Berman, B.L., Boeglin, W., Camsonne, A., Canan, M., Chirapatpimol, K., Cisbani, E., Cusanno, F., de Jager, C.W., Dutta, C., Garibaldi, F., Geagla, O., Gilman, R., Glister, J., Higinbotham, D.W., Jiang, X., Katramatou, A.T., Khrosinkova, E., Lee, B.W., LeRose, J.J., Lindgren, R., McCullough, E., Meekins, D., Michaels, R., Moffit, B., Petratos, G.G., Piasetzky, E., Qian, X., Qiang, Y., Rodriguez, I., Ron, G., Saha, A., Sarty, A.J., Sawatzky, B., Schulte, E., Shneor, R., Sparveris, N., Subedi, R., Strauch, S., Sulkosky, V., Wang, Y., Wojtsekhowski, B., Yan, X., Yao, H., Zhan, X., and Zheng, X.

Published
2010
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27. Virtual compton scattering in the resonance region up to the deep inelastic region at backward angles and momentum transfer squared of $Q^2$ = 1.0 $GeV^2$

Author

Laveissiere, G., Degrande, N., Jaminion, S., Jutier, C., Todor, L., Di Salvo, R., Van Hoorebeke, L., Alexa, L.C., Anderson, B.D., Aniol, K.A., Arundell, K., Audit, G., Auerbach, L., Baker, F.T., Baylac, M., Berthot, J., Bertin, P.Y., Bertozzi, W., Bimbot, L., Boeglin, W.U., Brash, E.J., BRETON, Vincent, Breuer, H., Burtin, E., Calarco, J.R., Cardman, L.S., Cavata, C., Chang, C.C., Chen, J.P., Chudakov, E., Cisbani, E., Dale, D.S., De Jager, C.W., De Leo, R., Deur, A., D'Hose, N., Dodge, G.E., Domingo, J.J., Elouadrhiri, L., Epstein, M.B., Ewell, L.A., Finn, J.M., Fissum, K.G., Fonvieille, H., Fournier, G., Frois, B., Frullani, S., Furget, C., Gao, H., Gao, J., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Grenier, P., Guichon, P.A.M., Hansen, J.O., Holmes, R., Holtrop, M., Howell, C., Huber, G.M., Hyde-Wright, C.E., Incerti, S., Iodice, M., Jardillier, J., Jones, M.K., Kahl, W., Kamalov, S., Kato, S., Katramatou, A.T., Kelly, J.J., Kerhoas, S., Ketikyan, A., Khayat, M., Kino, K., Kox, S., Kramer, L.H., Kumar, K.S., Kumbartzki, G., Kuss, M., Leone, A., LeRose, J.J., Liang, M., Lindgren, R.A., Liyanage, N., Lolos, G.J., Lourie, R.W., Madey, R., Maeda, K., Malov, S., Manley, D.M., Marchand, C., Marchand, D., Margaziotis, D.J., Markowitz, P., Marroncle, J., Martino, J., Martoff, C.J., McCormick, K., McIntyre, J., Mehrabyan, S., Merchez, F., Meziani, Z.E., Michaels, R., Miller, G.W., Mougey, J.Y., Nanda, S.K., Neyret, D., Offermann, E.A.J.M., Papandreou, Z., Perdrisat, C.F., Perrino, R., Petratos, G.G., Platchkov, S., Pomatsalyuk, R., Prout, D.L., Punjabi, V.A., Pussieux, T., Quéméner, G., Ransome, R.D., Ravel, O., Real, J.S., Renard, F., Roblin, Y., Rowntree, D., Rutledge, G., Rutt, P.M., Saha, A., Saito, T., Sarty, A.J., Serdarevic, A., Smith, T., Smirnov, George, Soldi, K., Sorokin, P., Souder, P.A., Suleiman, R., Templon, J.A., Terasawa, T., Tiator, L., Tieulent, R., Tomasi-Gustaffson, E., Tsubota, H., Ueno, H., Ulmer, P.E., Urciuoli, G.M., Van De Vyver, R., Van Der Meer, R.L.J., Vernin, P., Vlahovic, B., Voskanyan, H., Voutier, E., Watson, J.W., Weinstein, L.B., Wijesooriya, K., Wilson, R., Wojtsekhowski, B.B., Zainea, D.G., Zhang, W.M., Zhao, J., Zhou, Z.L., 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), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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 Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes)

Subjects
High Energy Physics - Experiment (hep-ex), 13.60.-r, 13.60.Fz, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment
Abstract

We have made the first measurements of the virtual Compton scattering process via the e p -> e p gamma exclusive reaction at Q**2 = 1 GeV**2 in the nucleon resonance region. The cross section is obtained at center of mass (CM) backward angle, theta_gamma_gamma*, in a range of total (gamma* p) CM energy W from the proton mass up to W = 1.91 GeV. The data show resonant structures in the first and second resonance regions, and are well reproduced at higher W by the Bethe-Heitler+Born cross section, including t-channel pi0-exchange. At high W, our data, together with existing real photon data, show a striking Q**2 independence. Our measurement of the ratio of H(e,e'p)gamma to H(e,e'p)pi0 cross sections is presented and compared to model predictions., 6 pages, 5 figures, Bibtex format, to be submitted to Physical Review Letters includes cross section tables

Published
2004

28. Measurement of the generalized polarizabilities of the proton in virtual compton scattering at $Q^2$ = 0.92 and 1.76 Gev$^2$

Author

Laveissiere, G., Todor, L., Degrande, N., Jaminion, S., Jutier, C., Di Salvo, R., Van Hoorebeke, L., Alexa, L.C., Anderson, B.D., Aniol, K.A., Arundell, K., Audit, G., Auerbach, L., Baker, F.T., Baylac, M., Berthot, J., Bertin, P.Y., Bertozzi, W., Bimbot, L., Boeglin, W.U., Brash, E.J., BRETON, Vincent, Breuer, H., Burtin, E., Calarco, J.R., Cardman, L.S., Cavata, C., Chang, C.C., Chen, J.P., Chudakov, E., Cisbani, E., Dale, D.S., De Jager, C.W., De Leo, R., Deur, A., D'Hose, N., Dodge, G.E., Domingo, J.J., Elouadrhiri, L., Epstein, M.B., Ewell, L.A., Finn, J.M., Fissum, K.G., Fonvieille, H., Fournier, G., Frois, B., Frullani, S., Furget, C., Gao, H., Gao, J., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Grenier, P., Guichon, P.A.M., Hansen, J.O., Holmes, R., Holtrop, M., Howell, C., Huber, G.M., Hyde-Wright, C.E., Incerti, S., Iodice, M., Jardillier, J., Jones, M.K., Kahl, W., Kato, S., Katramatou, A.T., Kelly, J.J., Kerhoas, S., Ketikyan, A., Khayat, M., Kino, K., Kox, S., Kramer, L.H., Kumar, K.S., Kumbartzki, G., Kuss, M., Leone, A., LeRose, J.J., Liang, M., Lindgren, R.A., Liyanage, N., Lolos, G.J., Lourie, R.W., Madey, R., Maeda, K., Malov, S., Manley, D.M., Marchand, C., Marchand, D., Margaziotis, D.J., Markowitz, P., Marroncle, J., Martino, J., Martoff, C.J., McCormick, K., McIntyre, J., Mehrabyan, S., Merchez, F., Meziani, Z.E., Michaels, R., Miller, G.W., Mougey, J.Y., Nanda, S.K., Neyret, D., Offermann, E.A.J.M., Papandreou, Z., Perdrisat, C.F., Perrino, R., Petratos, G.G., Platchkov, S., Pomatsalyuk, R., Prout, D.L., Punjabi, V.A., Pussieux, T., Quéméner, G., Ransome, R.D., Ravel, O., Real, J.S., Renard, F., Roblin, Y., Rowntree, D., Rutledge, G., Rutt, P.M., Saha, A., Saito, T., Sarty, A.J., Serdarevic, A., Smith, T., Smirnov, George, Soldi, K., Sorokin, P., Souder, P.A., Suleiman, R., Templon, J.A., Terasawa, T., Tieulent, R., Tomasi-Gustaffson, E., Tsubota, H., Ueno, H., Ulmer, P.E., Urciuoli, G.M., Van De Vyver, R., Van Der Meer, R.L.J., Vernin, P., Vlahovic, B., Voskanyan, H., Voutier, E., Watson, J.W., Weinstein, L.B., Wijesooriya, K., Wilson, R., Wojtsekhowski, B.B., Zainea, D.G., Zhang, W.M., Zhao, J., Zhou, Z.L., 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), 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), 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 SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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), 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 de Nantes (UN)-Mines Nantes (Mines Nantes)

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), 13.60.Fz, Elastic and Compton scattering, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], FOS: Physical sciences, Physics::Accelerator Physics
Abstract

We report a Virtual Compton Scattering study of the proton at low CM energies. We have determined the structure functions $P_{LL}-P_{TT}/\epsilon$ and $P_{LT}$, and the electric and magnetic Generalized Polarizabilities (GPs) $\alpha_E(Q2)$ and $\beta_M(Q2)$ at momentum transfer Q2= 0.92 and 1.76 GeV2. The electric GP shows a strong fall-off with Q2, and its global behavior does not follow a simple dipole form. The magnetic GP shows a rise and then a fall-off; this can be interpreted as the dominance of a long-distance diamagnetic pion cloud at low Q2, compensated at higher Q2 by a paramagnetic contribution from $\pi N$ intermediate states., Comment: 4 pages, 2 Figs. Version for PRL after PRL cancelled their request for reducing length of paper

Published
2004

29. Measurement of the 3He(e,e'p)pn reaction at high missing energies and momenta

Author

Benmokhtar, F., Rvachev, M.M., Penel-Nottaris, E., Aniol, K.A., Bertozzi, W., Boeglin, W.U., Butaru, F., Calarco, J.R., Chai, Z., Chang, C.C., Chen, J.-P., Chudakov, E., Cisbani, E., Cochran, A., Cornejo, J., Dieterich, S., Djawotho, P., Duran, W., Epstein, M.B., Finn, J.M., Fissum, K.G., Frahi-Amroun, A., Frullani, S., Furget, C., Garibaldi, F., Gayou, O., Gilad, S., Gilman, R., Glashausser, C., Hansen, J.-O., Higinbotham, D.W., Hotta, A., Hu, B., Iodice, M., Iomni, R., De Jager, C.W., Jiang, X., Jones, M.K., Kelly, J.J., Kox, S., Kuss, M., Laget, J.M., De Leo, R., LeRose, J.J., Liatard, E., Lindgren, R., Liyanage, N., Lourie, R.W., Malov, S., Margaziotis, D.J., Markowitz, P., Merchez, F., Michaels, R., Mitchell, J., Mougey, J., Perdrisat, C.F., Punjabi, V.A., Quéméner, G., Ransome, R.D., Réal, J.S., Roché, R., Sabatié, F., Saha, A., Simon, D., Strauch, S., Suleiman, R., Tamae, T., Templon, J.A., Tieulent, R., Ueno, H., Ulmer, P.E., Urciuoli, G.M., Voutier, E., Wijesooriya, K., Wojtsekhowski, B., 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), and HALL A

Subjects
electron-nucleus reactions, 25.30.Fj, 13.75.Cs, 24.85.+p, 27.10.+h, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, nuclei with mass number 1 to 5
Abstract

Results of the Jefferson Lab Hall A quasielastic 3He(e,e'p)pn measurements are presented. These measurements were performed at fixed transferred momentum and energy, q = 1502 MeV/c and omega = 840 MeV, respectively, for missing momenta p_m up to 1 GeV/c and missing energies in the continuum region, up to pion threshold; this kinematic coverage is much more extensive than that of any previous experiment. The cross section data are presented along with the effective momentum density distribution and compared to theoretical models., Comment: 5 pages, 3 figures, updated to reflect published paper: minor text changes from previous version along with updated and added references

Published
2004
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30. Backward electroproduction of $\pi^0$ mesons on protons in the region of nucleon resonances at four momentum transfer squared $Q^2 = 1.0 GeV^2$

Author

Laveissiere, G., Degrande, N., Jaminion, S., Jutier, C., Todor, L., Di Salvo, R., Van Hoorebeke, L., Alexa Stony, L.C., Anderson, B.D., Aniol, K.A., Arundell, K., Audit, G., Auerbach, L., Baker, F.T., Baylac, M., Berthot, J., Bertin, P.Y., Bertozzi, W., Bimbot, L., Boeglin, W.U., Brash, E.J., BRETON, Vincent, Breuer, H., Burtin, E., Calarco, J.R., Cardman, L.S., Cavata, C., Chang, C.C., Chen, J.P., Chudakov, E., Cisbani, E., Dale, D.S., De Jager, C.W., De Leo, R., Deur, A., D'Hose, N., Dodge, G.E., Domingo, J.J., Elouadrhiri, L., Epstein, M.B., Ewell, L.A., Finn, J.M., Fissum, K.G., Fonvieille, H., Fournier, G., Frois, B., Frullani, S., Furget, C., Gao, H., Gao, J., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Grenier, P., Guichon, P.A.M., Hansen, J.O., Holmes, R., Holtrop, M., Howell, C., Huber, G.M., Hyde-Wright, C.E., Incerti, S., Iodice, M., Jardillier, J., Jones, M.K., Kahl, W., Kamalov, S., Kato, S., Katramatou, A.T., Kelly, J.J., Kerhoas, S., Ketikyan, A., Khayat, M., Kino, K., Kox, S., Kramer, L.H., Kumar, K.S., Kumbartzki, G., Kuss, M., Leone, A., LeRose, J.J., Liang, M., Lindgren, R.A., Liyanage, N., Lolos, G.J., Lourie, R.W., Madey, R., Maeda, K., Malov, S., Manley, D.M., Marchand, C., Marchand, D., Margaziotis, D.J., Markowitz, P., Marroncle, J., Martino, J., Martoff, C.J., McCormick, K., McIntyre, J., Mehrabyan, S., Merchez, F., Meziani, Z.E., Michaels, R., Miller, G.W., Mougey, J.Y., Nanda, S.K., Neyret, D., Offermann, E.A.J.M., Papandreou, Z., Perdrisat, C.F., Perrino, R., Petratos, G.G., Platchkov, S., Pomatsalyuk, R., Prout, D.L., Punjabi, V.A., Pussieux, T., Quéméner, G., Ransome, R.D., Ravel, O., Real, J.S., Renard, F., Roblin, Y., Rowntree, D., Rutledge, G., Rutt, P.M., Saha, A., Saito, T., Sarty, A.J., Serdarevic, A., Smith, T., Smirnov, George, Soldi, K., Sorokin, P., Souder, P.A., Suleiman, R., Templon, J.A., Terasawa, T., Tiator, L., Tieulent, R., Tomasi-Gustaffson, E., Tsubota, H., Ueno, H., Ulmer, P.E., Urciuoli, G.M., Van De Vyver, R., Van Der Meer, R.L.J., Vernin, P., Vlahovic, B., Voskanyan, H., Voutier, E., Watson, J.W., Weinstein, L.B., Wijesooriya, K., Wilson, R., Wojtsekhowski, B.B., Zainea, D.G., Zhang, W.M., Zhao, J., Zhou, Z.L., 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), 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), 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 SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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), 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 de Nantes (UN)-Mines Nantes (Mines Nantes)

Subjects
electron-proton interactions, 13.60.Le, 14.20.Gk, Nuclear Theory, pion production, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, hadron electroproduction, Nuclear Experiment
Abstract

PHASE; International audience; Exclusive electroproduction of pi0 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 sigmaT+epsilonsigmaL, sigmaTL, and sigmaTT were separated from the azimuthal distribution and are presented together with the MAID and SAID parametrizations.

Published
2004

31. The dynamics of the quasielastic $^{16}O$(e,e'p) reaction at $Q^2$ $\approx$ 0.8 (GeV/c)$^2$

Author

G. Fissum, K., Liang, M., D. Anderson, B., A. Aniol, K., Auerbach, L., T. Baker, F., Berthot, J., Bertozzi, W., Bertin, P.Y., Bimbot, L., U. Boeglin, W., J. Brash, E., BRETON, Vincent, Breuer, H., Burtin, E., R. Calarco, J., S. Cardman, L., D. Cates, G., Cavata, C., C. Chang, C., Chen, J.-P., Cisbani, E., S. Dale, D., W. De Jager, C., De Leo, R., Deur, A., Diederich, B., Djawotho, P., Domingo, J., Ducret, J.-E., B. Epstein, M., Ewell, L.A., M. Finn, J., Fonvieille, H., Frois, B., Frullani, S., Gao, J., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Gorringe, T., W. Hersman, F., Holmes, R., Holtrop, M., D'Hose, N., Howell, C., M. Huber, G., E. Hyde-Wright, C., Iodice, M., Jaminion, S., K. Jones, M., Joo, K., Jutier, C., Kahl, W., Kato, S., Kelly, J.J., Kerhoas, S., Khandaker, M., Khayat, M., Kino, K., Korsch, W., Kramer, L., S. Kumar, K., Kumbartzki, G., Laveissière, G., Leone, A., LeRose, J.J., Levchuk, L., A. Lindgren, R., Liyanage, N., J. Lolos, G., W. Lourie, R., Madey, R., Maeda, K., Malov, S., M. Manley, D., J. Margaziotis, D., Markowitz, P., Martino, J., S. Mccarthy, J., McCormick, K., McIntyre, J., L. J. Van Der Meer, R., Meziani, Z.-E., Michaels, R., Mougey, J., Nanda, S., Neyret, D., A. J. M. Offermann, E., Papandreou, Z., F. Perdrisat, C., Perrino, R., G. Petratos, G., Platchkov, S., Pomatsalyuk, R., L. Prout, D., A. Punjabi, V., Pussieux, T., Quéméner, G., D. Ransome, R., Ravel, O., Roblin, Y., Roche, R., Rowntree, D., A. Rutledge, G., M. Rutt, P., Saha, A., Saito, T., J. Sarty, A., Serdarevic-Offermann, A., P. Smith, T., Soldi, A., Sorokin, P., Souder, P., Suleiman, R., A. Templon, J., Terasawa, T., Todor, L., Tsubota, H., Ueno, H., E. Ulmer, P., M. Urciuoli, G., Vernin, P., Van Verst, S., Vlahovic, B., Voskanyan, H., W. Watson, J., B. Weinstein, L., Wijesooriya, K., Wojtsekhowski, B., G. Zainea, D., Zeps, V., Zhao, J., Zhou, Z.-L., 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 SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-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), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), 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
Nuclear Theory, 25.30.Fj, 24.70.+s, 27.20.+n, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The physics program in Hall A at Jefferson Lab commenced in the summer of 1997 with a detailed investigation of the 16O(e,e'p) reaction in quasielastic, constant (q,w) kinematics at Q^2 ~ 0.8 (GeV/c)^2, q ~ 1 GeV/c, and w ~ 445 MeV. Use of a self-calibrating, self-normalizing, thin-film waterfall target enabled a systematically rigorous measurement. Differential cross-section data for proton knockout were obtained for 0 < Emiss < 120 MeV and 0 < pmiss < 350 MeV/c. These results have been used to extract the ALT asymmetry and the RL, RT, RLT, and RL+TT effective response functions. Detailed comparisons of the data with Relativistic Distorted-Wave Impulse Approximation, Relativistic Optical-Model Eikonal Approximation, and Relativistic Multiple-Scattering Glauber Approximation calculations are made. The kinematic consistency of the 1p-shell normalization factors extracted from these data with respect to all available 16O(e,e'p) data is examined. The Q2-dependence of the normalization factors is also discussed., 43 pages, 25 figures, all known typos now corrected

Published
2004

32. Measurement of the generalized polarizabilities of the proton in virtual compton scattering at $Q^2=0.92 and 1.76 GeV^2$: II. Dispersion relation analysis

Author

Laveissiere, G., Todor, L., Degrande, N., Jaminion, S., Jutier, C., Di Salvo, R., Van Hoorebeke, L., Alexa, L.C., Anderson, B.D., Aniol, K.A., Arundell, K., Audit, G., Auerbach, L., Baker, F.T., Baylac, M., Berthot, J., Bertin, P.Y., Bertozzi, W., Bimbot, L., Boeglin, W.U., Brash, E.J., BRETON, Vincent, Breuer, H., Burtin, E., Calarco, J.R., Cardman, L.S., Cavata, C., Chang, C.C., Chen, J.P., Chudakov, E., Cisbani, E., Dale, D.S., De Jager, C.W., De Leo, R., Deur, A., D'Hose, N., Dodge, G.E., Domingo, J.J., Elouadrhiri, L., Epstein, M.B., Ewell, L.A., Finn, J.M., Fissum, K.G., Fonvieille, H., Fournier, G., Frois, B., Frullani, S., Furget, C., Gao, H., Gao, J., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Grenier, P., Guichon, P.A.M., Hansen, J.O., Holmes, R., Holtrop, M., Howell, C., Huber, G.M., Hyde-Wright, C.E., Incerti, S., Iodice, M., Jardillier, J., Jones, M.K., Kahl, W., Kato, S., Katramatou, A.T., Kelly, J.J., Kerhoas, S., Ketikyan, A., Khayat, M., Kino, K., Kox, S., Kramer, L.H., Kumar, K.S., Kumbartzki, G., Kuss, M., Leone, A., LeRose, J.J., Liang, M., Lindgren, R.A., Liyanage, N., Lolos, G.J., Lourie, R.W., Madey, R., Maeda, K., Malov, S., Manley, D.M., Marchand, C., Marchand, D., Margaziotis, D.J., Markowitz, P., Marroncle, J., Martino, J., Martoff, C.J., McCormick, K., McIntyre, J., Mehrabyan, S., Merchez, F., Meziani, Z.E., Michaels, R., Miller, G.W., Mougey, J.Y., Nanda, S.K., Neyret, D., Offermann, E.A.J.M., Papandreou, Z., Pasquini, B., Perdrisat, C.F., Perrino, R., Petratos, G.G., Platchkov, S., Pomatsalyuk, R., Prout, D.L., Punjabi, V.A., Pussieux, T., Quéméner, G., Ransome, R.D., Ravel, O., Real, J.S., Renard, F., Roblin, Y., Rowntree, D., Rutledge, G., Rutt, P.M., Saha, A., Saito, T., Sarty, A.J., Serdarevic, A., Smith, T., Smirnov, George, Soldi, K., Sorokin, P., Souder, P.A., Suleiman, R., Templon, J.A., Terasawa, T., Tieulent, R., Tomasi-Gustaffson, E., Tsubota, H., Ueno, H., Ulmer, P.E., Urciuoli, G.M., Vanderhaeghen, M., Van De Vyver, R., Van Der Meer, R.L.J., Vernin, P., Vlahovic, B., Voskanyan, H., Voutier, E., Watson, J.W., Weinstein, L.B., Wijesooriya, K., Wilson, R., Wojtsekhowski, B.B., Zainea, D.G., Zhang, W.M., Zhao, J., Zhou, Z.L., 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 SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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 Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes)

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

PHASE

Published
2004

33. Measurement of the generalized polarizabilities of the proton in virtual compton scattering at $Q^2=0.92 and 1.76 GeV^2$: I. Low energy expansion analysis

Author

Jaminion, S., Degrande, N., Laveissiere, G., Jutier, C., Todor, L., Di Salvo, R., Van Hoorebeke, L., Alexa, S., Anderson, B.D., Aniol, K.A., Arundell, K., Audit, G., Auerbach, L., Baker, F.T., Baylac, M., Berthot, J., Bertin, P.Y., Bertozzi, W., Bimbot, L., Boeglin, W.U., Brash, E.J., BRETON, Vincent, Breuer, H., Burtin, E., Calarco, J.R., Cardman, L.S., Cavata, C., Chang, C.C., Chen, J.P., Chudakov, E., Cisbani, E., Dale, D.S., De Jager, C.W., De Leo, R., Deur, A., D'Hose, N., Dodge, G.E., Domingo, J.J., Elouadrhiri, L., Epstein, M.B., Ewell, L.A., Finn, J.M., Fissum, K.G., Fonvieille, H., Fournier, G., Frois, B., Frullani, S., Furget, C., Gao, H., Gao, J., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Grenier, P., Guichon, P.A.M., Hansen, J.O., Holmes, R., Holtrop, M., Howell, C., Huber, G.M., Hyde-Wright, C.E., Incerti, S., Iodice, M., Jardillier, J., Jones, M.K., Kahl, W., Kato, S., Katramatou, A.T., Kelly, J.J., Kerhoas, S., Ketikyan, A., Khayat, M., Kino, K., Kox, S., Kramer, L.H., Kumar, K.S., Kumbartzki, G., Kuss, M., Leone, A., LeRose, J.J., Liang, M., Lindgren, R.A., Liyanage, N., Lolos, G.J., Lourie, R.W., Madey, R., Maeda, K., Malov, S., Manley, D.M., Marchand, C., Marchand, D., Margaziotis, D.J., Markowitz, P., Marroncle, J., Martino, J., Martoff, C.J., McCormick, K., McIntyre, J., Mehrabyan, S., Merchez, F., Meziani, Z.E., Michaels, R., Miller, G.W., Mougey, J.Y., Nanda, S.K., Neyret, D., Offermann, E.A.J.M., Papandreou, Z., Perdrisat, C.F., Perrino, R., Petratos, G.G., Platchkov, S., Pomatsalyuk, R., Prout, D.L., Punjabi, V.A., Pussieux, T., Quéméner, G., Ransome, R.D., Ravel, O., Real, J.S., Renard, F., Roblin, Y., Rowntree, D., Rutledge, G., Rutt, P.M., Saha, A., Saito, T., Sarty, A.J., Serdarevic, A., Smith, T., Smirnov, George, Soldi, K., Sorokin, P., Souder, P.A., Suleiman, R., Templon, J.A., Terasawa, T., Tieulent, R., Tomasi-Gustaffson, E., Tsubota, H., Ueno, H., Ulmer, P.E., Urciuoli, G.M., Van De Vyver, R., Van Der Meer, R.L.J., Vernin, P., Vlahovic, B., Voskanyan, H., Voutier, E., Watson, J.W., Weinstein, L.B., Wijesooriya, K., Wilson, R., Wojtsekhowski, B.B., Zainea, D.G., Zhang, W.M., Zhao, J., Zhou, Z.L., 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 SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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 Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes)

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

PHASE

Published
2004

34. Polarization transfer in the He-4((e)over-right-arrow,e '(p)over-right-arrow)H-3 reaction up to Q(2)=2.6 (GeV/c)(2)

Author

Strauch, S., Dieterich, S., Aniol, K.A., Annand, J.R.M., Baker, O.K., Bertozzi, W., Boswell, M., Brash, E.J., Chai, Z., Chen, J.P., Christy, M.E., Chudakov, E., Cochran, A., De Leo, R., Ent, R., Epstein, M.B., Finn, J.M., Fissum, K.G., Forest, T.A., Frullani, S., Garibaldi, F., Gasparian, A., Gayou, O., Gilad, S., Gilman, R., Glashausser, C., Gomez, J., Gorbenko, V., Gueye, P.L.J., Hansen, J.O., Higinbotham, D.W., Hu, B., Hyde-Wright, C.E., Ireland, D.G., Jackson, C., de Jager, C.W., Jiang, X., Jones, C., Jones, M.K., Kellie, J.D., Kelly, J.J., Keppel, C.E., Kumbartzki, G., Kuss, M., LeRose, J.J., Livingston, K., Liyanage, N., Malov, S., Margaziotis, D.J., Meekins, D., and van den Brand, J.F.J.

Subjects
BOUND NUCLEONS, COULOMB SUM-RULE, FORM-FACTORS, DEPENDENCE, SCATTERING, RESPONSE FUNCTIONS
Abstract

We have measured the proton recoil polarization in the He-4((e) over right arrow ,e('')(p) over right arrow)H-4 reaction at Q(2)=0.5, 1.0, 1.6, and 2.6 (GeV/c)(2). The measured ratio of polarization transfer coefficients differs from a fully relativistic calculation, favoring the inclusion of a medium modification of the proton form factors predicted by a quark-meson coupling model. In addition, the measured induced polarizations agree reasonably well with the fully relativistic calculation indicating that the treatment of final-state interactions is under control.

Published
2003

35. Measurement of $G_{Ep}/G_{Mp}$ in $\vec{e}p\rightarrow e\vec{p}$ to $Q^2 = 5.6 GeV^2$

Author

Gayou, O., Benmokhtar, F., Bertozzi, W., Bimbot, L., Brash, E.J., Calarco, J.R., Cavata, C., Chai, Z., Chang, C.C., Chang, T., Chen, J.P., Chudakov, E., de Leo, R., Dieterich, S., Endres, R., Epstein, M.B., Escoffier, S., Fissum, K.G., Fonvieille, H., Frullani, S., Gao, J., Garibaldi, F., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Hansen, J.O., Higinbotham, D.W., Huber, G.M., Iodice, M., de Jager, C.W., Jiang, X., Jones, M.K., Kelly, J.J., Khandaker, M., Kozlov, A.., Kramer, K.M., Kumbartzki, G., Lerose, J.J., Lhuillier, D., Lindgren, R.A., Liyanage, N., Lolos, G.L., Margaziotis, D.J., Marie, F., Markowitz, P., Mccormick, K., Michaels, R., Milbrath, M.D., Nanda, S.K., Neyret, D., Papandreou, Z., Pentchev, L., Perdrisat, C.F., Piskunov, N.M., Punjabi, V., Pussieux, T., Quéméner, G., Ransome, R.D., Raue, B.A., Roch, R., Rvachev, M., Saha, A., Salgado, C., Sirca, S., Sitnik, I., Strauch, S., Todor, L., Tomasi-Gustafsson, E., Urciuoli, G.M., Voskanyan, H., Wijesooriya, K., Wojtsekhowski, B.B., Zheng, X., Zhu, L., 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 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), 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
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

The ratio of the electric and magnetic form factors of the proton, GEp/GMp, was measured at the Thomas Jefferson National Accelerator Facility (JLab) using the recoil polarization technique. The ratio of the form factors is directly proportional to the ratio of the transverse to longitudinal components of the polarization of the recoil proton in the elastic e⃗p→ep⃗\vec ep \to e\vec pep→ep ​ reaction. The new data presented in this article span the range 3.5 < Q2 < 5.6 GeV2 and are well described by a linear Q2 fit. Also, the ratio QF2p/F1p reaches a constant value above Q2=2 GeV2

Published
2002

36. Recoil polarization measurements for neutral pion electroproduction at Q2=1(GeV/c)2 near the Δ resonance

Author

Kelly, J.J., Kelly, J.J., Gayou, O., Roche, R.E., Chai, Z., Jones, M.K., Sarty, A.J., Frullani, S., Aniol, K., Beise, E.J., Benmokhtar, F., Bertozzi, W., Boeglin, W.U., Botto, T., Brash, E.J., Breuer, H., Brown, E., Burtin, E., Calarco, J.R., Cavata, C., Chang, C.C., Chant, N.S., Chen, J.-P., Coman, M., Crovelli, D., De Leo, R., Dieterich, S., Escoffier, S., Fissum, K.G., Garde, V., Garibaldi, F., Georgakopoulos, S., Gilad, S., Gilman, R., Glashausser, C., Hansen, J.-O., Higinbotham, D.W., Hotta, A., Huber, G.M., Ibrahim, H., Iodice, M., de Jager, C.W., Jiang, X., Kimenko, A., Kozlov, A., Kumbartzki, G., Kuss, M., Lagamba, L., Laveissiere, G., LeRose, J.J., Lindgren, R.A., Liyange, N., Lolos, G.J., Lourie, R.W., Margaziotis, D.J., Marie, F., Markowitz, P., McAleer, S., Meekins, D., Michaels, R., Milbrath, B.D., Mitchell, J., Nappa, J., Neyret, D., Perdrisat, C.F., Potokar, M., Punjabi, V.A., Pussieux, T., Ransome, R.D., Roos, P.G., Rvachev, M., Saha, A., Sirca, S., Suleiman, R., Strauch, S., Templon, J.A., Todor, L., Ulmer, P.E., Urciuoli, G.M., Weinstein, L.B., Wijsooriya, K., Wojtsekhowski, B., Zheng, X., Zhu, L., Jefferson Laboratory E91011 and Hall A Collaborations, Kelly, J.J., Kelly, J.J., Gayou, O., Roche, R.E., Chai, Z., Jones, M.K., Sarty, A.J., Frullani, S., Aniol, K., Beise, E.J., Benmokhtar, F., Bertozzi, W., Boeglin, W.U., Botto, T., Brash, E.J., Breuer, H., Brown, E., Burtin, E., Calarco, J.R., Cavata, C., Chang, C.C., Chant, N.S., Chen, J.-P., Coman, M., Crovelli, D., De Leo, R., Dieterich, S., Escoffier, S., Fissum, K.G., Garde, V., Garibaldi, F., Georgakopoulos, S., Gilad, S., Gilman, R., Glashausser, C., Hansen, J.-O., Higinbotham, D.W., Hotta, A., Huber, G.M., Ibrahim, H., Iodice, M., de Jager, C.W., Jiang, X., Kimenko, A., Kozlov, A., Kumbartzki, G., Kuss, M., Lagamba, L., Laveissiere, G., LeRose, J.J., Lindgren, R.A., Liyange, N., Lolos, G.J., Lourie, R.W., Margaziotis, D.J., Marie, F., Markowitz, P., McAleer, S., Meekins, D., Michaels, R., Milbrath, B.D., Mitchell, J., Nappa, J., Neyret, D., Perdrisat, C.F., Potokar, M., Punjabi, V.A., Pussieux, T., Ransome, R.D., Roos, P.G., Rvachev, M., Saha, A., Sirca, S., Suleiman, R., Strauch, S., Templon, J.A., Todor, L., Ulmer, P.E., Urciuoli, G.M., Weinstein, L.B., Wijsooriya, K., Wojtsekhowski, B., Zheng, X., Zhu, L., and Jefferson Laboratory E91011 and Hall A Collaborations

Abstract

We measured angular distributions of differential cross section, beam analyzing power, and recoil polarization for neutral pion electroproduction at Q2=1.0 (GeV/c)2 in 10 bins of 1.17⩽W⩽1.35 GeV across the Δ resonance. A total of 16 independent response functions were extracted, of which 12 were observed for the first time. Comparisons with recent model calculations show that response functions governed by real parts of interference products are determined relatively well near the physical mass, W=MΔ≈1.232 GeV, but the variation among models is large for response functions governed by imaginary parts, and for both types of response functions, the variation increases rapidly with W>MΔ. We performed a multipole analysis that adjusts suitable subsets of ℓπ⩽2 amplitudes with higher partial waves constrained by baseline models. This analysis provides both real and imaginary parts. The fitted multipole amplitudes are nearly model independent—there is very little sensitivity to the choice of baseline model or truncation scheme. By contrast, truncation errors in the traditional Legendre analysis of N→Δ quadrupole ratios are not negligible. Parabolic fits to the W dependence around MΔ for the multiple analysis gives values for Re(S1+/M1+)=(-6.61±0.18)% and Re(E1+/M1+)=(-2.87±0.19)% for the pπ0 channel at W=1.232 GeV and Q2=1.0 (GeV/c)2 that are distinctly larger than those from the Legendre analysis of the same data. Similarly, the multipole analysis gives Re(S0+/M1+)=(+7.1±0.8)% at W=1.232 GeV, consistent with recent models, while the traditional Legendre analysis gives the opposite sign because its truncation errors are quite severe.

Published
2007

37. Recoil Polarization for Δ Excitation in Pion Electroproduction

Author

Kelly, J.J., Kelly, J.J., Roche, R.E., Chai, Z., Jones, M.K., Gayou, O., Sarty, A.J., Frullani, S., Aniol, K., Beise, E.J., Benmokhtar, F., Bertozzi, W., Boeglin, W.U., Botto, T., Brash, E.J., Breuer, H., Brown, E., Burtin, E., Calarco, J.R., Cavata, C., Chang, C.C., Chant, N.S., Chen, J.-P., Coman, M., Crovelli, D., De Leo, R., Dieterich, S., Escoffier, S., Fissum, K.G., Garde, V., Garibaldi, F., Georgakopoulus, S., Gilad, S., Gilman, R., Glashausser, C., Hansen, J.-O., Higinbotham, D.W., Hotta, A., Huber, G.M., Ibrahim, H., Iodice, M., de Jager, C.W., Jiang, X., Klimenko, A., Kozlov, A., Kumbartzki, G., Kuss, M., Lagamba, L., Laveissiere, G., LeRose, J.J., Lindgren, R.A., Liyanage, N., Lolos, G.J., Lourie, R.W., Margaziotis, D.J., Marie, F., Markowitz, P., McAleer, S., Meekins, D., Michaels, R., Milbrath, B.D., Mitchell, J., Nappa, J., Neyret, D., Perdrisat, C.F., Potokar, M., Punjabi, V.A., Pussieux, T., Ransome, R.D., Roos, P.G., Rvachev, M., Saha, A., Sirca, S., Suleiman, R., Strauch, S., Templon, J.A., Todor, L., Ulmer, P.E., Urciuoli, G.M., Weinstein, L.B., Wijesooriya, K., Wojtsekhowski, B., Zheng, X., Zhu, L., Jefferson Laboratory E91011 and Hall A Collaborations, Kelly, J.J., Kelly, J.J., Roche, R.E., Chai, Z., Jones, M.K., Gayou, O., Sarty, A.J., Frullani, S., Aniol, K., Beise, E.J., Benmokhtar, F., Bertozzi, W., Boeglin, W.U., Botto, T., Brash, E.J., Breuer, H., Brown, E., Burtin, E., Calarco, J.R., Cavata, C., Chang, C.C., Chant, N.S., Chen, J.-P., Coman, M., Crovelli, D., De Leo, R., Dieterich, S., Escoffier, S., Fissum, K.G., Garde, V., Garibaldi, F., Georgakopoulus, S., Gilad, S., Gilman, R., Glashausser, C., Hansen, J.-O., Higinbotham, D.W., Hotta, A., Huber, G.M., Ibrahim, H., Iodice, M., de Jager, C.W., Jiang, X., Klimenko, A., Kozlov, A., Kumbartzki, G., Kuss, M., Lagamba, L., Laveissiere, G., LeRose, J.J., Lindgren, R.A., Liyanage, N., Lolos, G.J., Lourie, R.W., Margaziotis, D.J., Marie, F., Markowitz, P., McAleer, S., Meekins, D., Michaels, R., Milbrath, B.D., Mitchell, J., Nappa, J., Neyret, D., Perdrisat, C.F., Potokar, M., Punjabi, V.A., Pussieux, T., Ransome, R.D., Roos, P.G., Rvachev, M., Saha, A., Sirca, S., Suleiman, R., Strauch, S., Templon, J.A., Todor, L., Ulmer, P.E., Urciuoli, G.M., Weinstein, L.B., Wijesooriya, K., Wojtsekhowski, B., Zheng, X., Zhu, L., and Jefferson Laboratory E91011 and Hall A Collaborations

Abstract

We measured angular distributions of recoil-polarization response functions for neutral pion electroproduction for W=1.23 GeV at Q2=1.0 (GeV/c)2, obtaining 14 separated response functions plus 2 Rosenbluth combinations; of these, 12 have been observed for the first time. Dynamical models do not describe quantities governed by imaginary parts of interference products well, indicating the need for adjusting magnitudes and phases for nonresonant amplitudes. We performed a nearly model-independent multipole analysis and obtained values for Re (S1+/M1+)=-(6.84±0.15)% and Re (E1+/M1+)=-(2.91±0.19)% that are distinctly different from those from the traditional Legendre analysis based upon M1+ dominance and ℓπ≤1 truncation.

Published
2005

38. Methods for optical calibration of the BigBite hadron spectrometer

Author

Mihovilovič, M., primary, Širca, S., additional, Allada, K., additional, Anderson, B.D., additional, Annand, J.R.M., additional, Averett, T., additional, Camsonne, A., additional, Chan, R.W., additional, Chen, J.-P., additional, Chirapatpimol, K., additional, de Jager, C.W., additional, Gilad, S., additional, Hamilton, D.J., additional, Hansen, J.-O., additional, Higinbotham, D.W., additional, Huang, J., additional, Jiang, X., additional, Jin, G., additional, Korsch, W., additional, LeRose, J.J., additional, Lindgren, R.A., additional, Liyanage, N., additional, Long, E., additional, Michaels, R., additional, Moffit, B., additional, Monaghan, P., additional, Nelyubin, V., additional, Norum, B.E., additional, Piasetzky, E., additional, Qian, X., additional, Qiang, Y., additional, Riordan, S., additional, Ron, G., additional, Rosner, G., additional, Sawatzky, B., additional, Shabestari, M., additional, Shahinyan, A., additional, Shneor, R., additional, Subedi, R., additional, Sulkosky, V., additional, Watson, J.W., additional, and Zhang, Y.-W., additional

Published
2012
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39. High-precision measurement of the proton elastic form factor ratio μpGE/GM at low Q2

Author

Zhan, X., primary, Allada, K., additional, Armstrong, D.S., additional, Arrington, J., additional, Bertozzi, W., additional, Boeglin, W., additional, Chen, J.-P., additional, Chirapatpimol, K., additional, Choi, S., additional, Chudakov, E., additional, Cisbani, E., additional, Decowski, P., additional, Dutta, C., additional, Frullani, S., additional, Fuchey, E., additional, Garibaldi, F., additional, Gilad, S., additional, Gilman, R., additional, Glister, J., additional, Hafidi, K., additional, Hahn, B., additional, Hansen, J.-O., additional, Higinbotham, D.W., additional, Holmstrom, T., additional, Holt, R.J., additional, Huang, J., additional, Huber, G.M., additional, Itard, F., additional, de Jager, C.W., additional, Jiang, X., additional, Johnson, M., additional, Katich, J., additional, de Leo, R., additional, LeRose, J.J., additional, Lindgren, R., additional, Long, E., additional, Margaziotis, D.J., additional, May-Tal Beck, S., additional, Meekins, D., additional, Michaels, R., additional, Moffit, B., additional, Norum, B.E., additional, Olson, M., additional, Piasetzky, E., additional, Pomerantz, I., additional, Protopopescu, D., additional, Qian, X., additional, Qiang, Y., additional, Rakhman, A., additional, Ransome, R.D., additional, Reimer, P.E., additional, Reinhold, J., additional, Riordan, S., additional, Ron, G., additional, Saha, A., additional, Sarty, A.J., additional, Sawatzky, B., additional, Schulte, E.C., additional, Shabestari, M., additional, Shahinyan, A., additional, Shneor, R., additional, Širca, S., additional, Solvignon, P., additional, Sparveris, N.F., additional, Strauch, S., additional, Subedi, R., additional, Sulkosky, V., additional, Vilardi, I., additional, Wang, Y., additional, Wojtsekhowski, B., additional, Ye, Z., additional, and Zhang, Y., additional

Published
2011
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40. Update of High Resolution Hypernuclear Spectroscopy at Jefferson Lab's Hall A

Author

Cusanno, F., primary, Acha, A., additional, Bydžovský, P., additional, Chang, C.C., additional, Cisbani, E., additional, De Jager, C.W., additional, De Leo, R., additional, Frullani, S., additional, Garibaldi, F., additional, Higinbotham, D.W., additional, Iodice, M., additional, LeRose, J.J., additional, Markowitz, P., additional, Marrone, S., additional, Sotona, M., additional, and Urciuoli, G.M., additional

Published
2010
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42. Erratum to: “Performance and results of the RICH detector for kaon physics in Hall A at Jefferson Lab”

Author

Iodice, M., primary, Cisbani, E., additional, Colilli, S., additional, Cusanno, F., additional, Frullani, S., additional, Fratoni, R., additional, Garibaldi, F., additional, Gricia, M., additional, Lucentini, M., additional, Pierangeli, L., additional, Santavenere, F., additional, Urciuoli, G.M., additional, Veneroni, P., additional, De Cataldo, G., additional, De Leo, R., additional, Di Bari, D., additional, Lagamba, L., additional, Nappi, E., additional, Marrone, S., additional, Kross, B., additional, LeRose, J.J., additional, Reitz, B., additional, Segal, J., additional, Zorn, C., additional, and Breuer, H., additional

Published
2006
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45. High-precision measurement of the proton elastic form factor ratio μpGE/GM at low Q2

Author

Zhan, X., Allada, K., Armstrong, D.S., Arrington, J., Bertozzi, W., Boeglin, W., Chen, J.-P., Chirapatpimol, K., Choi, S., Chudakov, E., Cisbani, E., Decowski, P., Dutta, C., Frullani, S., Fuchey, E., Garibaldi, F., Gilad, S., Gilman, R., Glister, J., Hafidi, K., Hahn, B., Hansen, J.-O., Higinbotham, D.W., Holmstrom, T., Holt, R.J., Huang, J., Huber, G.M., Itard, F., de Jager, C.W., Jiang, X., Johnson, M., Katich, J., de Leo, R., LeRose, J.J., Lindgren, R., Long, E., Margaziotis, D.J., May-Tal Beck, S., Meekins, D., Michaels, R., Moffit, B., Norum, B.E., Olson, M., Piasetzky, E., Pomerantz, I., Protopopescu, D., Qian, X., Qiang, Y., Rakhman, A., Ransome, R.D., Reimer, P.E., Reinhold, J., Riordan, S., Ron, G., Saha, A., Sarty, A.J., Sawatzky, B., Schulte, E.C., Shabestari, M., Shahinyan, A., Shneor, R., Širca, S., Solvignon, P., Sparveris, N.F., Strauch, S., Subedi, R., Sulkosky, V., Vilardi, I., Wang, Y., Wojtsekhowski, B., Ye, Z., and Zhang, Y.

Subjects
Nuclear Experiment
Abstract

We report a new, high-precision measurement of the proton elastic form factor ratio μpGE/GM for the four-momentum transfer squared Q2=0.3–0.7(GeV/c)2. The measurement was performed at Jefferson Lab (JLab) in Hall A using recoil polarimetry. With a total uncertainty of approximately 1%, the new data clearly show that the deviation of the ratio μpGE/GM from unity observed in previous polarization measurements at high Q2 continues down to the lowest Q2 value of this measurement. The updated global fit that includes the new results yields an electric (magnetic) form factor roughly 2% smaller (1% larger) than the previous global fit in this Q2 range. We obtain new extractions of the proton electric and magnetic radii, which are 〈rE2〉1/2=0.875±0.010 fm and 〈rM2〉1/2=0.867±0.020 fm. The charge radius is consistent with other recent extractions based on the electron–proton interaction, including the atomic hydrogen Lamb shift measurements, which suggests a missing correction in the comparison of measurements of the proton charge radius using electron probes and the recent extraction from the muonic hydrogen Lamb shift.

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