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1. Ratios of (15)N/(12)C and (4)He/(12)C inclusive electroproduction cross sections in the nucleon resonance region

Author

Bosted, Pe, Fersch, R, Adams, G, Amarian, M, Anefalos Pereira Sergio, Anghinolfi, Marco, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, Jp, Baltzell, Na, Barrow, S, Batourine, V, Battaglieri, Marco, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Biselli, As, Bonner, Be, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Brooks, Wk, Ultmann, Sbr, Burkert, Vd, Butuceanu, C, Calarco, Jr, Careccia, Sl, Carman, Ds, Carnahan, B, Cazes, A, Chen, S, Cole, Pl, Collins, P, Coltharp, P, Cords, D, Corvisiero, Pietro, Crabb, D, Crannell, H, Crede, V, Cummings, Jp, De Masi, R, De Vita Raffaella, De Sanctis Enzo, Degtyarenko, Pv, Denizli, H, Dennis, L, Deur, A, Djalali, C, Dodge, Ge, Donnelly, J, Doughty, D, Dragovitsch, P, Dugger, M, Dharmawardane, Kv, Dytman, S, Dzyubak, Op, Egiyan, H, Egiyan, Ks, Elouadrhiri, L, Eugenio, P, Fatemi, R, Fedotov, G, Feuerbach, Rj, Forest, Ta, Fradi, A, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girod, Fx, Goetz, Jt, Golovatch, E, Gothe, Rw, Griffioen, Ka, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, C, Hafidi, K, Hakobyan, Rs, Hardie, J, Heddle, D, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Huertas, M, Hyde Wright CE, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Isupov, El, Ito, Mm, Jenkins, D, Jo, Hs, Joo, K, Juengst, Hg, Kalantarians, N, Keith, C, Kellie, Jd, Khandaker, M, Kim, Ky, Kim, K, Kim, W, Klein, A, Klein, Fj, Klusman, M, Kossov, M, Kramer, Lh, Kubarovsky, V, Kuhn, J, Kuhn, Se, Kuleshov, Sv, Lachniet, J, Laget, Jm, Langheinrich, J, Lawrence, D, Li, J, Lima, Acs, Livingston, K, Lu, H, Lukashin, K, Maccormick, M, Markov, N, Mcaleer, S, Mckinnon, B, Mcnabb, Jwc, Mecking, Ba, Mestayer, Md, Meyer, Ca, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, Marco, Miskimen, R, Mokeev, V, Morand, L, Morrow, Sa, Moteabbed, M, Mueller, J, Mutchler, Gs, Nadel Turonski, P, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niroula, Mr, Niyazov, Ra, Nozar, M, O'Rielly, Gv, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Paterson, C, Philips, Sa, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, Ermanno, Pozdniakov, S, Preedom, Bm, Price, Jw, Prok, Y, Protopopescu, D, Qin, Lm, Raue, Ba, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Rosner, G, Rossi, Patrizia, Rowntree, D, Rubin, Pd, Sabatie, F, Salgado, C, Santoro, Jp, Sapunenko, Vladimir, Schumacher, Ra, Serov, Vs, Sharabian, Yg, Shaw, J, Shvedunov, Nv, Skabelin, Av, Smith, Es, Smith, Lc, Sober, Di, Stavinsky, A, Stepanyan, Ss, Stepanyan, S, Stokes, Be, Stoler, P, Strauch, S, Suleiman, R, Taiuti, MAURO GINO, Taylor, S, Tedeschi, Dj, Thoma, U, Tkabladze, A, Tkachenko, S, Todor, L, Ungaro, M, Vineyard, Mf, Vlassov, Av, Weinstein, Lb, Weygand, Dp, Williams, M, Wolin, E, Wood, Mh, Yegneswaran, A, Yun, J, Zana, L, Zhang, J, Zhao, B, Zhao, Z., 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), Thomas Jefferson National Accelerator Facility (Jefferson Lab), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
ELECTRON-SCATTERING, DEPENDENCE, CLAS, 25.30.Fj,13.60.Hb,27.20.+n, QUARK-HADRON DUALITY, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], QUARK-HADRON DUALITY, ELECTRON-SCATTERING, DEPENDENCE, CLAS, Nuclear Experiment
Abstract

The (W,Q2)-dependence of the ratio of inclusive electron scattering cross sections for 15N/12C was determined in the kinematic range 0.8, Comment: 13 pages, 2 figures. Significantly shortened version. Results unchanged. Small additions for Phys. Rev. C

Published
2008

2. First Measurement of Beam-Recoil Observables $C_x$ and $C_z$ in Hyperon Photoproduction

Author

Bradford, Rk, Schumacher, Ra, Adams, G, Amaryan, Mj, Ambrozewicz, P, Anciant, E, Anghinolfi, Marco, Asavapibhop, B, Asryan, G, Audit, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, Jp, Baltzell, Na, Barrow, S, Batourine, V, Battaglieri, Marco, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Berman, Bl, Bianchi, Nicola, Biselli, As, Bonner, Be, Bouchigny, S, Boiarinov, S, Branford, D, Briscoe, Wj, Brooks, Wk, Bultmann, S, Burkert, Vd, Butuceanu, C, Calarco, Jr, Careccia, Sl, Carman, Ds, Carnahan, B, Chen, S, Cole, Pl, Coleman, A, Collins, P, Coltharp, P, Cords, D, Corvisiero, Pietro, Crabb, D, Crannell, H, Crede, V, Cummings, Jp, De Masi, R, De Sanctis Enzo, De Vita Raffaella, Degtyarenko, Pv, Denizli, H, Dennis, L, Deur, A, Dharmawardane, Kv, Dickson, R, Djalali, C, Dodge, Ge, Donnelly, J, Doughty, D, Dragovitsch, P, Dugger, M, Dytman, S, Dzyubak, Op, Egiyan, H, Egiyan, Ks, El Fassi, L, Elouadrhiri, L, Empl, A, Eugenio, P, Fatemi, R, Fedotov, G, Feldman, Gerald, Feuerbach, Rj, Forest, Ta, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girod, Fx, Goetz, Jt, Gonenc, A, Gothe, Rw, Griffioen, Ka, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, Cynthia, Hafidi, K, Hakobyan, H, Hakobyan, Rs, Hardie, J, Heddle, D, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Hu, J, Huertas, M, Hyde Wright CE, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Isupov, El, Ito, Mm, Jenkins, D, Jo, Hs, Joo, K, Juengst, Hg, Kalantarians, N, Kellie, Jd, Khandaker, M, Kim, Ky, Kim, K, Kim, W, Klein, A, Klein, Fj, Klusman, M, Kossov, M, Kramer, Lh, Kubarovsky, V, Kuhn, J, Kuhn, Se, Kuleshov, Sv, Lachniet, J, Laget, Jm, Langheinrich, J, Lawrence, D, Lima, Acs, Livingston, K, Lu, Hy, Lukashin, K, Maccormick, M, Manak, Jj, Marchand, C, Markov, N, Mcaleer, S, Mckinnon, B, Mcnabb, Jwc, Mecking, Ba, Mestayer, Md, Meyer, Ca, Mibe, T, Mikhailov, K, Mirazita, Marco, Miskimen, R, Mokeev, V, Moriya, K, Morrow, Sa, Moteabbed, M, Muccifora, Valeria, Mueller, J, Mutchler, Gs, Nadel Turonski, P, Napolitano, J, Nasseripour, R, Natasha, N, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niroula, Mr, Niyazov, Ra, Nozar, M, O'Rielly, Gv, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Paterson, C, Philips, Sa, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, Ermanno, Popa, I, Pozdniakov, S, Preedom, Bm, Price, Jw, Prok, Y, Protopopescu, D, Qin, Lm, Quinn, Bp, Raue, Ba, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Ritchie, Bg, Ronchetti, Federico, Rosner, G, Rossi, Patrizia, Rowntree, D, Rubin, Pd, Sabatie, F, Salamanca, J, Salgado Lopez Carlos Alberto, Santoro, Joseph, Sapunenko, Vladimir, Serov, Vs, Shafi, A, Sharabian, Yg, Shaw, J, Shvedunov, Nv, Simionatto, S, Skabelin, Av, Smith, Es, Smith, Lc, Sober, Di, Sokhan, D, Spraker, M, Stavinsky, A, Stepanyan, Ss, Stepanyan, S, Stokes, Be, Stoler, P, Strakovsky, Ii, Strauch, S, Taiuti, MAURO GINO, Taylor, S, Tedeschi, Dj, Thoma, U, Thompson, R, Tkabladze, A, Tkachenko, S, Todor, L, Tur, C, Ungaro, M, Vineyard, Mf, Vlassov, Av, Wang, K, Watts, Dp, Weinstein, Lb, Weller, H, Weygand, Dp, Williams Meurig Crispin Stowe, Wolin, E, Wood, Mh, Yegneswaran, A, Yun, J, Zana, L, Zhang, J, Zhao, B, Zhao, Zw, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
POLARIZATION, BREMSSTRAHLUNG, PSEUDOSCALAR MESON PHOTOPRODUCTION, PHOTON ENERGIES, KAON PHOTOPRODUCTION, POLARIZATION, RESONANCES, SPIN, P(GAMMA, LAMBDA, BREMSSTRAHLUNG, K&LAMBDA, FOS: Physical sciences, P(GAMMA, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], LAMBDA, PSEUDOSCALAR MESON PHOTOPRODUCTION, SPIN, K&LAMBDA, PHOTON ENERGIES, 25.20.Lj, 13.40.-f, 13.60.Le, 14.20.Gk, KAON PHOTOPRODUCTION, Nuclear Experiment (nucl-ex), Nuclear Experiment, RESONANCES
Abstract

Spin transfer from circularly polarized real photons to recoiling hyperons has been measured for the reactions $\vec\gamma + p \to K^+ + \vec\Lambda$ and $\vec\gamma + p \to K^+ + \vec\Sigma^0$. The data were obtained using the CLAS detector at Jefferson Lab for center-of-mass energies $W$ between 1.6 and 2.53 GeV, and for $-0.85, Comment: 28 pages, 18 figures, Submitted to Physical Review C

Published
2007

3. Separated Structure Functions for the Exclusive Electroproduction of $K^+\Lambda$ and $K^+\Sigma^0$ Final States

Author

Ambrozewicz, P, Carman, Ds, Feuerbach, Rj, Mestayer, Md, Raue, Ba, Schumacher, Ra, Tkabladze, A, Amarian, Mj, Anghinolfi, Marco, Asavapibhop, B, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, Jp, Baltzell, Na, Barrow, S, Batourine, V, Battaglieri, Marco, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Berman, Bl, Bianchi, Nicola, Biselli, As, Bonner, Be, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Briscoe, Wj, Brooks, Wk, Bultmann, S, Burkert, Vd, Butuceanu, C, Calarco, Jr, Careccia, Sl, Cetina, C, Chen, S, Cole, Pl, Collins, P, Coltharp, P, Cords, D, Corvisiero, Pietro, Crabb, D, Crede, V, Cummings, Jp, Dashyan, N, De Masi, R, De Vita Raffaella, De Sanctis Enzo, Degtyarenko, Pv, Dennis, L, Deur, A, Dhuga, Ks, Dickson, R, Djalali, C, Dodge, Ge, Donnelly, J, Doughty, D, Dragovitsch, P, Dugger, M, Dytman, S, Dzyubak, Op, Egiyan, H, Egiyan, Ks, El Fassi, L, Elouadrhiri, L, Empl, A, Eugenio, P, Farhi, L, Fatemi, R, Fedotov, G, Feldman, Gerald, Forest, Ta, Frolov, V, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girard, P, Girod, Fx, Goetz, Jt, Gonenc, A, Gothe, Rw, Griffioen, Ka, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hafidi, K, Hakobyan, H, Hardie, J, Heddle, D, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Hu, J, Hyde Wright CE, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Isupov, El, Ito, Mm, Jenkins, D, Jo, Hs, Joo, K, Juengst, Hg, Kalantarians, N, Kellie, Jd, Khandaker, M, Kim, Ky, Kim, K, Kim, W, Klein, A, Klein, Fj, Klusman, M, Kossov, M, Kramer, Lh, Kubarovsky, V, Kuhn, J, Kuhn, Se, Kuleshov, Sv, Lachniet, J, Laget, Jm, Langheinrich, J, Lawrence, D, Livingston, K, Lu, Hy, Lukashin, K, Maccormick, M, Manak, Jj, Markov, N, Mcaleer, S, Mckinnon, B, Mcnabb, Jwc, Mecking, Ba, Meyer, Ca, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, Marco, Miskimen, R, Mokeev, V, Moriya, K, Morrow, Sa, Moteabbed, M, Muccifora, Valeria, Mueller, J, Mutchler, Gs, Nadel Turonski, P, Napolitano, J, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niroula, Mr, Niyazov, Ra, Nozar, M, O'Rielly, Gv, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Paterson, C, Philips, Sa, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, Ermanno, Pozdniakov, S, Preedom, Bm, Price, Jw, Prok, Y, Protopopescu, D, Qin, Lm, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Ritchie, Bg, Ronchetti, Federico, Rosner, G, Rossi, Patrizia, Rowntree, D, Rubin, Pd, Sabatie, F, Salamanca, J, Salgado Lopez Carlos Alberto, Santoro, Joseph, Sapunenko, Vladimir, Sayre, D, Serov, Vs, Shafi, A, Sharabian, Yg, Shvedunov, Nv, Simionatto, S, Skabelin, Av, Smith, Es, Smith, Lc, Sober, Di, Sokhan, D, Stavinsky, A, Stepanyan, Ss, Stepanyan, S, Stokes, Be, Stoler, P, Strakovsky, Ii, Strauch, S, Taiuti, MAURO GINO, Taylor, S, Tedeschi, Dj, Thompson, R, Tkachenko, S, Tur, C, Ungaro, M, Vineyard, Mf, Vlassov, Av, Wang, K, Watts, Dp, Weinstein, Lb, Weygand, Dp, Williams Meurig Crispin Stowe, Wolin, E, Wood, Mh, Yegneswaran, A, Yun, J, Zana, L, Zhang, J, Zhao, B, Zhao, Zw, 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), Thomas Jefferson National Accelerator Laboraory (TJNAL), Thomas Jefferson National Accelerator Laboratory, 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), CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
KAON PHOTOPRODUCTION, PHOTON ENERGIES, CLAS, RESONANCES, MESONS, SCATTERING, DIRECTION, K&LAMBDA, P(GAMMA, LAMBDA, P(GAMMA, MESONS, LAMBDA, High Energy Physics - Experiment, CLAS, K&LAMBDA, PHOTON ENERGIES, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], SCATTERING, KAON PHOTOPRODUCTION, High Energy Physics::Experiment, Nuclear Experiment, RESONANCES, DIRECTION
Abstract

We report measurements of the exclusive electroproduction of $K^+\Lambda$ and $K^+\Sigma^0$ final states from a proton target using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The separated structure functions $\sigma_T$, $\sigma_L$, $\sigma_{TT}$, and $\sigma_{LT}$ were extracted from the $\Phi$- and $\epsilon$-dependent differential cross sections taken with electron beam energies of 2.567, 4.056, and 4.247 GeV. This analysis represents the first $\sigma_L/\sigma_T$ separation with the CLAS detector, and the first measurement of the kaon electroproduction structure functions away from parallel kinematics. The data span a broad range of momentum transfers from $0.5\leq Q^2\leq 2.8$ GeV$^2$ and invariant energy from $1.6\leq W\leq 2.4$ GeV, while spanning nearly the full center-of-mass angular range of the kaon. The separated structure functions reveal clear differences between the production dynamics for the $\Lambda$ and $\Sigma^0$ hyperons. These results provide an unprecedented data sample with which to constrain current and future models for the associated production of strangeness, which will allow for a better understanding of the underlying resonant and non-resonant contributions to hyperon production., Comment: 61 pages, 26 figures, 5 tables

Published
2006

4. Quark-Hadron Duality in Spin Structure Functions g1p and g1d

Author

Bosted, Pe, Dharmawardane, Kv, Dodge, Ge, Forest, Ta, Kuhn, Se, Prok, Y, Adams, G, Amarian, M, Ambrozewicz, P, Anghinolfi, Marco, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, Jp, Baltzell, Na, Barrow, S, Batourine, V, Battaglieri, Marco, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Biselli, As, Bonner, Be, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Brooks, Wk, Bultmann, S, Burkert, Vd, Butuceanu, C, Calarco, Jr, Careccia, Sl, Carman, Ds, Carnahan, B, Cazes Antoine Jacques, Chen, S, Cole, Pl, Collins, P, Coltharp, P, Cords, D, Corvisiero, Pietro, Crabb, D, Crannell, H, Crede, V, Cummings, Jp, De Masi, R, Devita, R, De Sanctis Enzo, Degtyarenko, Pv, Denizli, H, Dennis, L, Deur, A, Djalali, C, Donnelly, J, Doughty, D, Dragovitsch, P, Dugger, M, Dytman, S, Dzyubak, Op, Egiyan, H, Egiyan, Ks, Elouadrhiri, L, Eugenio, P, Fatemi, R, Fedotov, G, Feuerbach, Rj, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girod, Fx, Goetz, Jt, Golovatch, Evgueni, Gonenc, A, Gothe, Rw, Griffioen, Ka, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, Cynthia, Hafidi, K, Hakobyan, Rs, Hardie, J, Heddle, D, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Huertas, M, Hyde Wright CE, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Isupov, El, Ito, Mm, Jenkins, D, Jo, Hs, Joo, K, Juengst, Hg, Keith, C, Kellie, Jd, Khandaker, M, Kim, Ky, Kim, K, Kim, W, Klein, A, Klein, Fj, Klusman, M, Kossov, M, Kramer, Lh, Kubarovsky, V, Kuhn, J, Kuleshov, Sv, Lachniet, J, Laget, Jm, Langheinrich, J, Lawrence, D, Jun, Li, Lima, Acs, Livingston, K, Lu, H, Lukashin, K, Maccormick, M, Manak, Jj, Markov, N, Mcaleer, S, Mckinnon, B, Mcnabb, Jwc, Mecking, Ba, Mestayer, Md, Meyer, Ca, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, Marco, Miskimen, R, Mokeev, V, Morand, L, Morrow, Sa, Moteabbed, M, Mueller, J, Mutchler, Gs, Nadel Turonski, P, Napolitano, J, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niroula, Mr, Niyazov, Ra, Nozar, M, O'Rielly, Gv, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Paterson, C, Philips, Sa, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, Ermanno, Pozdniakov, S, Preedom, Bm, Price, Jw, Protopopescu, D, Qin, Lm, Raue, Ba, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Ronchetti, Federico, Rosner, G, Rossi, Patrizia, Rowntree, D, Rubin, Pd, Sabatie, F, Salgado Lopez Carlos Alberto, Santoro, Joseph, Sapunenko, Vladimir, Schumacher, Ra, Serov, Vs, Sharabian, Yg, Shaw, J, Shvedunov, Nv, Skabelin, Av, Smith, Es, Smith, Lc, Sober, Di, Stavinsky, A, Stepanyan, Ss, Stepanyan, S, Stokes, Be, Stoler, P, Strauch, S, Suleiman, R, Taiuti, MAURO GINO, Taylor, S, Tedeschi, Dj, Thoma, U, Thompson, R, Tkabladze, A, Tkachenko, S, Todor, L, Tur, C, Ungaro, M, Vineyard, Mf, Vlassov, Av, Weinstein, Lb, Weygand, Dp, Williams Meurig Crispin Stowe, Wolin, E, Wood, Mh, Yegneswaran, A, Yun, J, Zana, L, Zhang, J, Zhao, B, Zhao, Z., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département 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), CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
RESONANCE-REGION, LOCAL DUALITY, FORM-FACTORS, SCATTERING, NUCLEON, TARGET, ELECTROPRODUCTION, ASYMMETRY, BEHAVIOR, PROTON, FORM-FACTORS, 13.60.Hb, 25.30.Fj, 24.30.Gd, ELECTROPRODUCTION, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], LOCAL DUALITY, PROTON, High Energy Physics - Phenomenology, TARGET, High Energy Physics - Phenomenology (hep-ph), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], RESONANCE-REGION, ASYMMETRY, SCATTERING, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), NUCLEON, Nuclear Experiment, BEHAVIOR
Abstract

New measurements of the spin structure functions of the proton and deuteron g1p(x,Q2) and g1d(x,Q2) in the nucleon resonance region are compared with extrapolations of target-mass-corrected next-to-leading-order (NLO) QCD fits to higher energy data. Averaged over the entire resonance region (W1.7 GeV2. This global duality appears to result from cancellations among the prominent local resonance regions: in particular strong sigma{3/2} contributions in the Delta(1232) region appear to be compensated by strong sigma{1/2} contributions in the resonance region centered on 1.5 GeV. These results are encouraging for the extension of NLO QCD fits to lower W and Q2 than have been used previously., 15 pages, 3 figures

Published
2006
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5. Deeply virtual and exclusive electroproduction of $\omega$-mesons

Author

Morand, L, Dore, D, Garcon, M, Guidal, M, Laget, Jm, Morrow, S, Sabatie, F, Smith, E, Adams, G, Arnbrozewicz, P, Anghinolfi, Marco, Asryan, G, Audit, G, Avakian, H, Bagdasaryan, H, Ball, J, Ball, Jp, Baltzell, Na, Barrow, S, Batourine, V, Battaglieri, Marco, Bektasoglu, M, Bellis, M, Benmouna, N, Berman, Bl, Biselli, As, Boiarinov, S, Bonner, Be, Bouchigny, S, Bradford, R, Branford, D, Briscoe, Wj, Brooks, Wk, Bultmann, S, Burkert, Vd, Butuceanu, C, Calarco, Jr, Careccia, Sl, Carman, Ds, Cazes Antoine Jacques, Chen, S, Cole, Pl, Cords, D, Corvisiero, Pietro, Crabb, D, Cummings, Jp, De Sanctis Enzo, Devita, R, Degtyarenko, Pv, Denizli, H, Dennis, L, Deur, A, Dharmawardane, Kv, Dhuga, Ks, Djalali, C, Dodge, Ge, Donnelly, J, Doughty, D, Dugger, M, Dytman, S, Dzyubak, Op, Egiyan, H, Egiyan, Ks, Elouadrhiri, L, Eugenio, P, Fatemi, R, Feldman, Gerald, Fersch, Rg, Feuerbach, Rj, Funsten, H, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girod, Fx, Goetz, Jt, Gordon, Cio, Gothe, Rw, Griffioen, Ka, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, Cynthia, Hakobyan, Rs, Hardie, J, Heddle, D, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Hyde Wright CE, Ilieva, Y, Ireland, Dg, Ito, Mm, Jenkins, D, Jo, Hs, Joo, K, Juengst, Hg, Kellie, Jd, Khandaker, M, Kim, W, Klein, A, Klein, Fj, Klimenko, Av, Kossov, M, Kubarovski, V, Kramer, Lh, Kuhn, Se, Kuhn, J, Lachniet, J, Langhenirich, J, Lawrence, D, Lee, T, Jun, Li, Livingston, K, Marchand, C, Maximon, Lc, Mcaleer, S, Mckinnon, B, Mcnabb, Jwc, Mecking, Ba, Mehrabyan, S, Melone, Jj, Mestayer, Md, Meyer, Ca, Mikhailov, K, Minehart, R, Mirazita, Marco, Miskimen, R, Mokeev, V, Mueller, J, Mutchler, Gs, Napolitano, J, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niyazov, Ra, Nozar, M, O'Rielly, Gv, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Philips, Sa, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, Ermanno, Popa, I, Pozdniakov, S, Preedom, Bm, Price, Jw, Prok, Y, Protopopescu, D, Raue, Ba, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Ritchie, Bg, Ronchetti, Federico, Rosner, G, Rossi, Patrizia, Rubin, Pd, Salgado Lopez Carlos Alberto, Santoro, Joseph, Sapunenko, Vladimir, Schumacher, Ra, Serov, Vs, Sharabian, Yg, Shaw, J, Skabelin, Av, Smith, Lc, Sober, Di, Stavinsky, A, Stepanyan, S, Stepanyan, Ss, Stokes, Be, Stoler, P, Strakovsky, Ii, Strauch, S, Taiuti, MAURO GINO, Tedeschi, Dj, Thoma, U, Tkabladze, A, Todor, L, Tur, C, Ungaro, M, Vineyard, Mf, Vlassov, Av, Weinstein, Lb, Weygand, Dp, Williams Meurig Crispin Stowe, Wolin, E, Wood, Mh, Yegneswaran, A, Zana, 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), and CLAS

Subjects
Nuclear and High Energy Physics, Particle physics, Photon, Meson, Proton, Nuclear Theory, FOS: Physical sciences, Parton, 13.60.Le - 12.40.Nn -12.38.Bx, 01 natural sciences, Omega, Resonance (particle physics), High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), GENERALIZED PARTON DISTRIBUTIONS, CLAS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], SCATTERING, 010306 general physics, Nuclear Experiment, Coupling, Physics, 010308 nuclear & particles physics, HYDROGEN, PHOTON, SPIN, GENERALIZED PARTON DISTRIBUTIONS, VECTOR-MESONS, SCATTERING, PHOTON, HYDROGEN, SPIN, CLAS, High Energy Physics::Experiment, Nucleon, VECTOR-MESONS
Abstract

The exclusive omega electroproduction off the proton was studied in a large kinematical domain above the nucleon resonance region and for the highest possible photon virtuality (Q2) with the 5.75 GeV beam at CEBAF and the CLAS spectrometer. Cross sections were measured up to large values of the four-momentum transfer (-t < 2.7 GeV2) to the proton. The contributions of the interference terms sigma_TT and sigma_TL to the cross sections, as well as an analysis of the omega spin density matrix, indicate that helicity is not conserved in this process. The t-channel pi0 exchange, or more generally the exchange of the associated Regge trajectory, seems to dominate the reaction gamma* p -> omega p, even for Q2 as large as 5 GeV2. Contributions of handbag diagrams, related to Generalized Parton Distributions in the nucleon, are therefore difficult to extract for this process. Remarkably, the high-t behaviour of the cross sections is nearly Q2-independent, which may be interpreted as a coupling of the photon to a point-like object in this kinematical limit., 15 pages,19 figures

Published
2005

6. Measurement of the Polarized Structure Function $\sigma_{LT^\prime}$ for Pion Electroproduction in the Roper Resonance Region

Author

Joo, K, Smith, Lc, Aznauryan, Ig, Burkert, Vd, Egiyan, H, Minehart, R, Adams, G, Ambrozewicz, P, Anciant, E, Anghinolfi, Marco, Asavapibhop, B, Asryan, G, Audit, G, Auger, T, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, Jp, Baltzell, Na, Barrow, S, Batourine, V, Battaglieri, Marco, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Berman, Bl, Bianchi, Nicola, Biselli, As, Bonner, Be, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Briscoe, Wj, Brooks, Wk, Bueltmann, S, Butuceanu, C, Calarco, Jr, Careccia, Sl, Carman, Ds, Carnahan, B, Cetina, C, Chen, S, Cole, Pl, Coleman, A, Coltharp, P, Cords, D, Corvisiero, Pietro, Crabb, D, Cummings, Jp, De Sanctis Enzo, Devita, R, Degtyarenko, Pv, Dennis, L, Deur, A, Dharmawardane, Kv, Dhuga, Ks, Djalali, C, Dodge, Ge, Donnelly, J, Doughty, D, Dragovitsch, P, Dugger, M, Dytman, S, Dzyubak, Op, Egiyan, Ks, Elouadrhiri, L, Empl, A, Eugenio, P, Farhi, L, Fatemi, R, Fedotov, G, Feldman, Gerald, Feuerbach, Rj, Forest, Ta, Frolov, V, Funsten, H, Gaff, Sj, Garcon, M, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girard, P, Girod, Fx, Goetz, Jt, Gothe, Rw, Griffioen, Ka, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hakobyan, Rs, Hardie, J, Heddle, D, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Hu, J, Hyde Wright CE, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Ito, Mm, Jenkins, D, Jo, Hs, Juengst, Hg, Kelley, Jh, Kellie, Jd, Khandaker, M, Kim, Ky, Kim, K, Kim, W, Klein, A, Klein, Fj, Klimenko, Av, Klusman, M, Kossov, M, Kramer, Lh, Kubarovsky, V, Kuhn, J, Kuhn, Se, Lachniet, J, Laget, Jm, Langheinrich, J, Lawrence, D, Lee, T, Livingston, K, Lukashin, K, Manak, Jj, Marchand, C, Maximon, Lc, Mcaleer, S, Mckinnon, B, Mcnabb, Jwc, Mecking, Ba, Mestayer, Md, Meyer, Ca, Mikhailov, K, Mirazita, Marco, Miskimen, R, Mokeev, V, Morrow, Sa, Muccifora, Valeria, Mueller, J, Mutchler, Gs, Nadel Turonski, P, Napolitano, J, Nasseripour, R, Nelson, So, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niyazov, Ra, Nozar, M, O'Rielly, Gv, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Peterson, G, Philips, Sa, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, Ermanno, Pozdniakov, S, Preedom, Bm, Price, Jw, Prok, Y, Protopopescu, D, Qin, Lm, Raue, Ba, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Ritchie, Bg, Ronchetti, Federico, Rosner, G, Rossi, Patrizia, Rowntree, D, Rubin, Pd, Sabatie, F, Sabourov, K, Salgado Lopez Carlos Alberto, Santoro, Joseph, Sapunenko, Vladimir, Schumacher, Ra, Serov, Vs, Shafi, A, Sharabian, Yg, Shaw, J, Simionatto, S, Skabelin, Av, Smith, Es, Sober, Di, Spraker, M, Stavinsky, A, Stepanyan, Ss, Stepanyan, S, Stokes, Be, Stoler, P, Strakovsky, Ii, Strauch, S, Taiuti, MAURO GINO, Taylor, S, Tedeschi, Dj, Thoma, U, Thompson, R, Tkabladze, A, Tur, C, Ungaro, M, Vineyard, Mf, Vlassov, Av, Wang, K, Weinstein, Lb, Weller, H, Weygand, Dp, Williams Meurig Crispin Stowe, Wolin, E, Wood, Mh, Yegneswaran, A, Yun, J, Zana, L, Zhang, J., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and CLAS

Subjects
BARYONS, MODEL, BARYONS, MODEL, High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The polarized longitudinal-transverse structure function $\sigma_{LT^\prime}$ measures the interference between real and imaginary amplitudes in pion electroproduction and can be used to probe the coupling between resonant and non-resonant processes. We report new measurements of $\sigma_{LT^\prime}$ in the $N(1440){1/2}^+$ (Roper) resonance region at $Q^2=0.40$ and 0.65 GeV$^2$ for both the $\pi^0 p$ and $\pi^+ n$ channels. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS) using longitudinally polarized electrons at a beam energy of 1.515 GeV. Complete angular distributions were obtained and are compared to recent phenomenological models. The $\sigma_{LT^\prime}(\pi^+ n)$ channel shows a large sensitivity to the Roper resonance multipoles $M_{1-}$ and $S_{1-}$ and provides new constraints on models of resonance formation., Comment: 5 pages, 3 figures. Revised manuscript accepted by Physical Review C (Brief Report)

Published
2005

7. Measurement of the x- and Q2-dependence of the asymmetry A1 on the nucleon

Author

Dharmawardane, Kv, Kuhn, Se, Bosted, P, Prok, Y, Adams, G, Ambrozewicz, P, Anghinolfi, Marco, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, Jp, Baltzell, Na, Barrow, S, Batourine, V, Battaglieri, Marco, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Biselli, As, Bonner, Be, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Brooks, Wk, Bultmann, S, Burkert, Vd, Butuceanu, C, Calarco, Jr, Careccia, Sl, Carman, Ds, Carnahan, B, Cazes Antoine Jacques, Chen, S, Cole, Pl, Collins, P, Coltharp, P, Cords, D, Corvisiero, Pietro, Crabb, D, Crannell, H, Crede, V, Cummings, Jp, De Masi, R, Devita, R, De Sanctis Enzo, Degtyarenko, Pv, Denizli, H, Dennis, L, Deur, A, Djalali, C, Dodge, Ge, Donnelly, J, Doughty, D, Draigovitsch, P, Dugger, M, Dytman, S, Dzyubak, Op, Egiyan, H, Egiyan, Ks, Elouadrhiri, L, Eugenio, P, Fatemi, R, Fedotov, G, Feuerbach, Rj, Forest, Ta, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girod, Fx, Goetz, Jt, Golovatch, Evgueni, Gonenc, A, Gothe, Rw, Griffioen, Ka, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, Cynthia, Hafidi, K, Hakobyan, Rs, Hardie, J, Heddle, D, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Huertas, M, Hyde Wriyht CE, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Isupov, El, Ito, Mm, Jenkins, D, Jo, Hs, Joo, K, Juengst, Hg, Keith, C, Kellie, Jd, Khandaker, M, Kim, Ky, Kim, K, Kim, W, Klein, A, Klein, Fj, Klusman, M, Kossov, M, Kramer, Lh, Kubarovsky, V, Kuhn, J, Kuleshov, Sv, Lachniet, J, Laget, Jm, Langheinrich, J, Lawrence, D, Jun, Li, Lima, Acs, Livingston, K, Lu, H, Lukashin, K, Maccormick, M, Manak, Jj, Markov, N, Mcaleer, S, Mckinnon, B, Mcnabb, Jwc, Mecking, Ba, Mestayer, Md, Meyer, Ca, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, Marco, Miskimen, R, Mokeev, V, Morand, L, Morrow, Sa, Moteabbed, M, Mueller, J, Mutchler, Gs, Nadel Turonski, P, Napolitano, J, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niroula, Mr, Nyazov, Ra, Nozar, M, O'Rielly, Gv, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Paterson, C, Philips, Sa, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, Ermanno, Pozdniakov, S, Preedom, Bm, Price, Jw, Protopopescu, D, Qin, Lm, Raue, Ba, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Ritchie, Bg, Ronchetti, Federico, Rosner, G, Rossi, Patrizia, Rowntree, D, Rubin, Pd, Sabatie, E, Salgado Lopez Carlos Alberto, Santoro, Joseph, Sapunenko, Vladimir, Schumacher, Ra, Serov, Vs, Sharabian, Yg, Shaw, J, Shvedunov, Nv, Skabelin, Av, Smith, Es, Smith, Lc, Sober, Di, Stavinsky, A, Stepanyan, Ss, Stepanyan, S, Stokes, Be, Stoler, P, Strakovsky, Ii, Strauch, S, Suleiman, R, Taiuti, MAURO GINO, Taylor, S, Tedeschi, Dj, Thoma, U, Thompson, R, Tkabladze, A, Tkachenko, S, Todor, L, Tur, C, Ungaro, M, Vineyard, Mf, Vlassov, Av, Weinstein, Lb, Weygand, Dp, Williams Meurig Crispin Stowe, Wolin, E, Wood, Mh, Yegneswaran, A, Yun, J, Zana, L, Zhang, J, Zhao, B, Zhao, Z., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département 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), CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
DEEP-INELASTIC-SCATTERING, Spin structure functions, QUARK, FOS: Physical sciences, 13.60.Hb, 13.88.+e, 14.20.Dh, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], PROTON, SUM-RULE, NEUTRON SPIN STRUCTURE, Nucleon structure, G(1)(N), CLAS, PION, DISTRIBUTIONS, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), NEUTRON SPIN STRUCTURE, DEEP-INELASTIC-SCATTERING, SUM-RULE, PROTON, DISTRIBUTIONS, G(1)(N), QUARK, CLAS, PION, Nuclear Experiment
Abstract

We report results for the virtual photon asymmetry $A_1$ on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton ($^{15}$NH$_3$) and deuteron ($^{15}$ND$_3$) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present paper, we concentrate on our results for $A_1(x,Q^2)$ and the related ratio $g_1/F_1(x,Q^2)$ in the resonance and the deep inelastic regions for our lowest and highest beam energies, covering a range in momentum transfer $Q^2$ from 0.05 to 5.0 GeV$^2$ and in final-state invariant mass $W$ up to about 3 GeV. Our data show detailed structure in the resonance region, which leads to a strong $Q^2$--dependence of $A_1(x,Q^2)$ for $W$ below 2 GeV. At higher $W$, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but $A_1(x,Q^2)$ is not strictly $Q^2$--independent. We add significantly to the world data set at high $x$, up to $x = 0.6$. Our data exceed the SU(6)-symmetric quark model expectation for both the proton and the deuteron while being consistent with a negative $d$-quark polarization up to our highest $x$. This data setshould improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions., Comment: 7 pages LaTeX, 5 figures

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8. Measurement of the x- and Q(2)-dependence of the asymmetry A(1) on the nucleon

Author

Bektaşoğlu, Mehmet, Dharmawardane, KV, Kuhn, SE, Bosted, P, Prok, Y, Adams, G, Ambrozewicz, P, Anghinolfi, M, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, JP, Baltzell, NA, Barrow, S, Batourine, V, Battaglieri, M, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Biselli, AS, Bonner, BE, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Brooks, WK, Bultmann, S, Burkert, VD, Butuceanu, C, Calarco, JR, Careccia, SL, Carman, DS, Carnahan, B, Cazes, A, Chen, S, Cole, PL, Collins, P, Coltharp, P, Cords, D, Corvisiero, P, Crabb, D, Crannell, H, Crede, V, Cummings, JP, De Masi, R, DeVita, R, De Sanctis, E, Degtyarenko, PV, Denizli, H, Dennis, L, Deur, A, Djalali, C, Dodge, GE, Donnelly, J, Doughty, D, Draigovitsch, P, Dugger, M, Dytman, S, Dzyubak, OP, Egiyan, H, Egiyan, KS, Elouadrhiri, L, Eugenio, P, Fatemi, R, Fedotov, G, Feuerbach, RJ, Forest, TA, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, GP, Giovanetti, KL, Girod, FX, Goetz, JT, Golovatch, E, Gonenc, A, Gothe, RW, Griffioen, KA, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, C, Hafidi, K, Hakobyan, RS, Hardie, J, Heddle, D, Hersman, FW, Hicks, K, Hleiqawi, I, Holtrop, M, Huertas, M, Hyde-Wriyht, CE, Ilieva, Y, Ireland, DG, Ishkhanov, BS, Isupov, EL, Ito, MM, Jenkins, D, Jo, HS, Joo, K, Juengst, HG, Keith, C, Kellie, JD, Khandaker, M, Kim, KY, Kim, K, Kim, W, Klein, A, Klein, FJ, Klusman, M, Kossov, M, Kramer, LH, Kubarovsky, V, Kuhn, J, Kuleshov, SV, Lachniet, J, Laget, JM, Langheinrich, J, Lawrence, D, Li, J, Lima, ACS, Livingston, K, Lu, H, Lukashin, K, MacCormick, M, Manak, JJ, Markov, N, McAleer, S, McKinnon, B, McNabb, JWC, Mecking, BA, Mestayer, MD, Meyer, CA, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, M, Miskimen, R, Mokeev, V, Morand, L, Morrow, SA, Moteabbed, M, Mueller, J, Mutchler, GS, Nadel-Turonski, P, Napolitano, J, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, BB, Niroula, MR, Nyazov, RA, Nozar, M, O'Rielly, GV, Osipenko, M, Ostrovidov, AI, Park, K, Pasyuk, E, Paterson, C, Philips, SA, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, E, Pozdniakov, S, Preedom, BM, Price, JW, Protopopescu, D, Qin, LM, Raue, BA, Riccardi, G, Ricco, G, Ripani, M, Ritchie, BG, Ronchetti, F, Rosner, G, Rossi, P, Rowntree, D, Rubin, PD, Sabatie, E, Salgado, C, Santoro, JP, Sapunenko, V, Schumacher, RA, Serov, VS, Sharabian, YG, Shaw, J, Shvedunov, NV, Skabelin, AV, Smith, ES, Smith, LC, Sober, DI, Stavinsky, A, Stepanyan, SS, Stepanyan, S, Stokes, BE, Stoler, P, Strakovsky, II, Strauch, S, Suleiman, R, Taiuti, M, Taylor, S, Tedeschi, DJ, Thoma, U, Thompson, R, Tkabladze, A, Tkachenko, S, Todor, L, Tur, C, Ungaro, M, Vineyard, MF, Vlassov, AV, Weinstein, LB, Weygand, DP, Williams, M, Wolin, E, Wood, MH, Yegneswaran, A, Yun, J, Zana, L, Zhang, J, Zhao, B, Zhao, Z, Sakarya Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü, and Bektaşoğlu, Mehmet

Subjects
Physics
Abstract

We report results for the virtual photon asymmetry A I on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton ((NH3)-N-15) and deuteron ((ND3)-N-15) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present. Letter, we concentrate on our results for A(1) (x, Q(2)) and the related ratio g(1)/F-1 (x, Q(2))) in the resonance and the deep inelastic regions for our J west and highest beam energies, covering a range in momentum transfer Q(2) from 0.05 to 5.0 (GeV/c)(2) and in final-state invariant mass W up to about 3 GeV. Our data show detailed structure in the resonance re-ion, which leads to a strong Q(2) dependence of A(1) (x, Q(2)) to. W below 2 GeV. At higher W, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but A I (x, Q(2)) is not strictly Q(2)-independent. We add significantly to the world data set at high x, up to x = 0.6. Our data exceed the SU(6)-symmetric quark model expectation for both the proton and the deuteron while being consistent with a negative d-quark polarization up to our highest x. This data set should improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions. (c) 2006 Elsevier B.V.All rights reserved.

Published
2006

9. Electron Scattering From High-Momentum Neutrons in Deuterium

Author

J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, Latifa Elouadrhiri, Shifeng Chen, R. C. Minehart, C. A. Meyer, N. A. Baltzell, B. B. Niczyporuk, Michael Wood, G. V. Fedotov, M. Battaglieri, V. S. Serov, N. Pivnyuk, K. A. Griffioen, R. Fatemi, J. R. Calarco, J. Napolitano, P. Corvisiero, A. Tkabladze, S. Bültmann, R. Bradford, L. C. Dennis, A. V. Vlassov, H. Avakian, D. P. Weygand, G. E. Dodge, S. A. Morrow, J. T. Goetz, Federico Ronchetti, J. Kuhn, P. V. Degtyarenko, W. Kim, J. P. Santoro, E. Pasyuk, S. A. Dytman, Cynthia Marie Hadjidakis, G. Niculescu, P. Ambrozewicz, Alexei V. Klimenko, K. S. Egiyan, K. Park, Chaden Djalali, V. P. Kubarovsky, O. Pogorelko, Michael Dugger, H. O. Funsten, P. Coltharp, I. Niculescu, Barry Ritchie, K. Mikhailov, Elton Smith, D. Lawrence, G. Ricco, A. Cazes, Bernhard Mecking, M. Bektasoglu, K. V. Dharmawardane, J. P. Cummings, M. M. Ito, Sylvain Bouchigny, G. S. Mutchler, P. Rossi, M. Anghinolfi, G. Rosner, R. A. Schumacher, James Mueller, H. Denizli, R. Nasseripour, P. Eugenio, S. Niccolai, M. Kossov, M. Taiuti, Friedrich Klein, C. I O Gordon, Brian Raue, P. Stoler, Y. G. Sharabian, G. Riccardi, S. Mehrabyan, R. DeVita, J. W C McNabb, L. Morand, S. Stepanyan, A. V. Skabelin, M. Bellis, J. Hardie, K. Hicks, M. Guillo, J. Pierce, G. Gavalian, Avraham Klein, V. Sapunenko, Dinko Pocanic, H. G. Juengst, E. De Sanctis, M. Osipenko, J. J. Melone, S. Tkachenko, N. Benmouna, M. Ripani, D. I. Sober, S. E. Kuhn, A.V. Stavinsky, C. Tur, D. J. Tedeschi, L. C. Smith, I. Bedlinskiy, W. K. Brooks, B. S. Ishkhanov, C. Butuceanu, B. E. Stokes, G. S. Adams, U. Thoma, K. Joo, E. Wolin, J. P. Ball, Y. Prok, D. G. Crabb, N. Dashyan, J. D. Kellie, R. G. Fersch, P. L. Cole, P. Nadel-Turonski, Tsutomu Mibe, J. Lachniet, R. S. Hakobyan, J. Langheinrich, S. S. Stepanyan, Daniel S. Carman, C. E. Hyde-Wright, Sergey Kuleshov, M. Nozar, M. Guidal, M. Holtrop, Victor Mokeev, L. Guo, M. Ungaro, D. Cords, A. Yegneswaran, V. Gyurjyan, J. Zhang, H. Bagdasaryan, D. Doughty, G. V. O'Rielly, D. G. Jenkins, S. McAleer, R. W. Gothe, F. X. Girod, I. Hleiqawi, S. L. Careccia, B. Zhao, K. L. Giovanetti, Atilla Gonenc, Larry Weinstein, F. W. Hersman, J. W. Price, M. Khandaker, N. Baillie, Y. Ilieva, Gerard Gilfoyle, S. Strauch, K. Livingston, H. Egiyan, R. A. Miskimen, B. McKinnon, N. Guler, S. Barrow, D. Branford, L. Todor, D. Protopopescu, M. Mirazita, J. M. Laget, S. Pozdniakov, M. Garçon, A. I. Ostrovidov, D. G. Ireland, Volker D. Burkert, A. S. Biselli, R. J. Feuerbach, Laird Kramer, V. Batourine, F. Sabatié, C. Paterson, Michael Vineyard, Ji Li, M. D. Mestayer, Michael L. Williams, S. Boiarinov, B. M. Preedom, Lorenzo Zana, H. S. Jo, C. Salgado, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, Klimenko, AV, Kuhn, SE, Butuceanu, C, Egiyan, KS, Griffioen, KA, Adams, G, Ambrozewicz, P, Anghinolfi, M, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, JP, Baltzell, NA, Barrow, S, Batourine, V, Battaglieri, M, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Biselli, AS, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Brooks, WK, Bultmann, S, Burkert, VD, Calarco, JR, Careccia, SL, Carman, DS, Cazes, A, Chen, S, Cole, PL, Coltharp, P, Cords, D, Corvisiero, P, Crabb, D, Cummings, JP, Dashyan, NB, DeVita, R, Sanctis, ED, Degtyarenko, PV, Denizli, H, Dennis, L, Dharmawardane, KV, Djalali, C, Dodge, GE, Donnelly, J, Doughty, D, Dugger, M, Dytman, S, Dzyubak, OP, Egiyan, H, Elouadrhiri, L, Eugenio, P, Fatemi, R, Fedotov, G, Fersch, RG, Feuerbach, RJ, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, GP, Giovanetti, KL, Girod, FX, Goetz, JT, Gonenc, A, Gordon, CIO, Gothe, RW, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, C, Hakobyan, RS, Hardie, J, Hersman, FW, Hicks, K, Hleiqawi, I, Holtrop, M, Hyde-Wright, CE, Ilieva, Y, Ireland, DG, Ishkhanov, BS, Ito, MM, Jenkins, D, Jo, HS, Joo, K, Juengst, HG, Kellie, JD, Khandaker, M, Kim, W, Klein, A, Klein, FJ, Kossov, M, Kramer, LH, Kubarovsky, V, Kuhn, J, Kuleshov, SV, Lachniet, J, Laget, JM, Langheinrich, J, Lawrence, D, Li, J, Livingston, K, McAleer, S, McKinnon, B, McNabb, JWC, Mecking, BA, Mehrabyan, S, Melone, JJ, Mestayer, MD, Meyer, CA, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, M, Miskimen, R, Mokeev, V, Morand, L, Morrow, SA, Mueller, J, Mutchler, GS, Nadel-Turonski, P, Napolitano, J, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, BB, Niyazov, RA, Nozar, M, O'Rielly, GV, Osipenko, M, Ostrovidov, AI, Park, K, Pasyuk, E, Paterson, C, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Pozdniakov, S, Preedom, BM, Price, JW, Prok, Y, Protopopescu, D, Raue, BA, Riccardi, G, Ricco, G, Ripani, M, Ritchie, BG, Ronchetti, F, Rosner, G, Rossi, P, Sabatie, F, Salgado, C, Santoro, JP, Sapunenko, V, Schumacher, RA, Serov, VS, Sharabian, YG, Skabelin, AV, Smith, ES, Smith, LC, Sober, DI, Stavinsky, A, Stepanyan, SS, Stepanyan, S, Stokes, BE, Stoler, P, Strauch, S, Taiuti, M, Tedeschi, DJ, Thoma, U, Tkabladze, A, Tkachenko, S, Todor, L, Tur, C, Ungaro, M, Vineyard, MF, Vlassov, AV, Weinstein, LB, Weygand, DP, Williams, M, Wolin, E, Wood, MH, Yegneswaran, A, Zana, L, Zhang, J, Zhao, B, Sakarya Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü, and Bektaşoğlu, Mehmet

Subjects
Nuclear reaction, Nuclear and High Energy Physics, 24.85.+p, 25.30.-c, 21.45.+v, Proton, Hadron, Nuclear Theory, FOS: Physical sciences, off-shell, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], PROTON, 01 natural sciences, FINAL-STATE INTERACTION, NUCLEI, PROTON, TARGETS, DEPENDENCE, RATIO, IRON, DIS, FIT, FINAL-STATE INTERACTION, Nuclear physics, RATIO, neutron, TARGETS, DEPENDENCE, 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, deuterium, Physics, DIS, NUCLEI, 010308 nuclear & particles physics, IRON, Momentum transfer, FIT, Deuterium, structure functions, Atomic physics, Nucleon, Lepton
Abstract

We report results from an experiment measuring the semi-inclusive reaction $d(e,e'p_s)$ where the proton $p_s$ is moving at a large angle relative to the momentum transfer. If we assume that the proton was a spectator to the reaction taking place on the neutron in deuterium, the initial state of that neutron can be inferred. This method, known as spectator tagging, can be used to study electron scattering from high-momentum (off-shell) neutrons in deuterium. The data were taken with a 5.765 GeV electron beam on a deuterium target in Jefferson Laboratory's Hall B, using the CLAS detector. A reduced cross section was extracted for different values of final-state missing mass $W^{*}$, backward proton momentum $\vec{p}_{s}$ and momentum transfer $Q^{2}$. The data are compared to a simple PWIA spectator model. A strong enhancement in the data observed at transverse kinematics is not reproduced by the PWIA model. This enhancement can likely be associated with the contribution of final state interactions (FSI) that were not incorporated into the model. A ``bound neutron structure function'' $F_{2n}^{eff}$ was extracted as a function of $W^{*}$ and the scaling variable $x^{*}$ at extreme backward kinematics, where effects of FSI appear to be smaller. For $p_{s}>400$ MeV/c, where the neutron is far off-shell, the model overestimates the value of $F_{2n}^{eff}$ in the region of $x^{*}$ between 0.25 and 0.6. A modification of the bound neutron structure function is one of possible effects that can cause the observed deviation., 33 pages RevTeX, 9 figures, to be submitted to Phys. Rev. C. Fixed 1 Reference

Published
2005

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