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12 results on '"N. D. Kvaltine"'

1. Precise measurements of beam spin asymmetries in semi-inclusive π0 production

Author

J. McAndrew, E. De Sanctis, E. Voutier, Michael Wood, K. Hafidi, Y. Prok, M. Aghasyan, D. I. Sober, S. Strauch, S. S. Stepanyan, D. P. Watts, R. Dupre, P. Eugenio, H. Egiyan, D. Keller, N. D. Kvaltine, F. Sabatié, M. Battaglieri, W. Gohn, M. Taiuti, S. Tkachenko, L. Guo, M. Khandaker, G. E. Dodge, H. Y. Lu, M. Y. Gabrielyan, D. Adikaram, M. Guidal, H. Avakian, M. Anghinolfi, E. Munevar, M. Holtrop, R. De Vita, Victor Mokeev, H. Seraydaryan, G. Rosner, C. E. Taylor, I. Niculescu, N. Guler, M. Ungaro, Y. G. Sharabian, A. Daniel, P. Nadel-Turonski, Luciano Pappalardo, W. J. Briscoe, V. Crede, S. Anefalos Pereira, D. Schott, J. P. Ball, S. Chandavar, D. S. Carman, A. M. Micherdzinska, E. Pasyuk, V. Kuznetsov, E. Seder, E. Golovatch, A. El Alaoui, H. Voskanyan, Y. Ilieva, A. I. Ostrovidov, K. Park, M. J. Amaryan, E. L. Isupov, Z. W. Zhao, N. Gevorgyan, K. Joo, George Davey Smith, D. G. Ireland, R. A. Schumacher, A. Ni, Sergey Kuleshov, S. E. Kuhn, S. Procureur, L. Graham, C. Djalali, V. P. Kubarovsky, B. McKinnon, C. E. Hyde, O. Pogorelko, Volker D. Burkert, A. S. Biselli, S. Bültmann, S. Park, B. Guegan, R. W. Gothe, Lorenzo Zana, S. Stepanyan, S. Fegan, P. Rossi, D. Branford, H. S. Jo, K. L. Giovanetti, Avraham Klein, M. Mirazita, I. I. Strakovsky, P. Khetarpal, C. Salgado, A. Fradi, S. Niccolai, A. Deur, W. Kim, Larry Weinstein, V. Batourine, Martin K. Mayer, P. L. Cole, N. Dashyan, G. Niculescu, H. Moutarde, B. Moreno, M. S. Saini, P. Stoler, K. Livingston, D. Doughty, H. Baghdasaryan, Gerard Gilfoyle, M. Contalbrigo, R. Dickson, Jie Zhang, G. Ricco, I. Bedlinskiy, N. Markov, B. Dey, R. Paremuzyan, M. Paolone, Friedrich Klein, S. Pisano, D. Protopopescu, Brian Raue, S. Pozdniakov, M. Garçon, K. Hicks, A. Kim, D. Rimal, W. Tang, M. Osipenko, B. Zhao, S. S. Jawalkar, I. J. D. MacGregor, D. Hasch, E. Phelps, D. G. Jenkins, F. X. Girod, A. DʼAngelo, J. W. Price, M. Ripani, C. Hanretty, J. T. Goetz, R. P. Bennett, Latifa Elouadrhiri, C. A. Meyer, G. V. Fedotov, D. P. Weygand, K. A. Griffioen, P. Collins, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), 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
Nuclear and High Energy Physics, Angular momentum, Particle physics, DEEP-INELASTIC SCATTERING, FINAL-STATE INTERACTIONS, PION ELECTROPRODUCTION, PARTON DISTRIBUTIONS, DRELL-YAN, LEPTOPRODUCTION, DEPENDENCE, Meson, media_common.quotation_subject, Nuclear Theory, Inelastic scattering, 01 natural sciences, Asymmetry, Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment, Nuclear physics, Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, 010306 general physics, QC, media_common, Physics, 010308 nuclear & particles physics, Deep inelastic scattering, Amplitude, Physics::Accelerator Physics, High Energy Physics::Experiment, Lepton
Abstract

We present studies of single-spin asymmetries for neutral pion electroproduction in semi-inclusive deep-inelastic scattering of 5.776 GeV polarized electrons from an unpolarized hydrogen target, using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. A substantial $\sin \phi_h$ amplitude has been measured in the distribution of the cross section asymmetry as a function of the azimuthal angle $\phi_h$ of the produced neutral pion. The dependence of this amplitude on Bjorken $x$ and on the pion transverse momentum is extracted with significantly higher precision than previous data and is compared to model calculations., Comment: to be submitted PLB

Published
2011
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2. Transverse polarization ofΣ+(1189)in photoproduction on a hydrogen target in CLAS

Author

M. Taiuti, B. S. Ishkhanov, H. Hakobyan, C. Hanretty, V. Mokeev, A. Kim, K. Hafidi, Z. W. Zhao, P. Khetarpal, M. Khandaker, I. Bedlinskiy, D. Ho, G. Charles, E. De Sanctis, F. X. Girod, S. E. Kuhn, Friedrich Klein, M. Aghasyan, Brian Raue, D. I. Sober, D. Protopopescu, V. Crede, R. A. Schumacher, Barry Ritchie, S. S. Stepanyan, B. Vernarsky, J. A. Fleming, S. Pozdniakov, F. Sabatié, D. Doughty, I. Zonta, J. W. Price, A. V. Vlassov, G. Rosner, N. K. Walford, H. Voskanyan, W. J. Briscoe, D. I. Glazier, George Davey Smith, E. Pasyuk, S. Fegan, C. E. Hyde, D. Heddle, R. A. Montgomery, S. Koirala, R. De Vita, S. Bültmann, W. Tang, M. Osipenko, David M. Keller, S. Anefalos Pereira, K. Hicks, S. Stepanyan, E. Munevar, B. Torayev, S. Tkachenko, T. Mineeva, E. Phelps, Avraham Klein, L. El Fassi, C. E. Taylor, S. Niccolai, Jie Zhang, M. J. Amaryan, E. Golovatch, W. Kim, N. Dashyan, N. Harrison, H. Seraydaryan, G. Niculescu, N. Guler, E. Seder, S. Park, R. W. Gothe, V. P. Kubarovsky, R. G. Fersch, P. Rossi, I. I. Strakovsky, H. Y. Lu, Y. G. Sharabian, P. L. Cole, O. Pogorelko, A. Deur, H. Baghdasaryan, C. S. Nepali, G. V. Fedotov, I. Niculescu, A. El Alaoui, Y. Ilieva, K. L. Giovanetti, Andrew Puckett, Martin K. Mayer, Nicholas Zachariou, K. P. Adhikari, D. P. Weygand, N. D. Kvaltine, C. Munoz Camacho, Larry Weinstein, M. S. Saini, J. P. Ball, D. Rimal, M. Ripani, D. S. Carman, J. J. Phillips, N. Markov, I. J. D. MacGregor, W. Gohn, B. McKinnon, M. Contalbrigo, S. Pisano, Sergey Kuleshov, M. Guidal, M. Mirazita, M. Holtrop, N. Gevorgyan, V. Batourine, Luciano Pappalardo, Diane Schott, A. I. Ostrovidov, K. Park, R. Paremuzyan, D. G. Ireland, Volker D. Burkert, A. S. Biselli, D. Sokhan, Lorenzo Zana, H. S. Jo, Andrea Celentano, S. Procureur, C. Salgado, S. Strauch, D. P. Watts, M. Y. Gabrielyan, E. L. Isupov, Ye Tian, S. Chandavar, C. Djalali, K. A. Griffioen, S. Boiarinov, R. Dupre, E. Voutier, M. Battaglieri, J. T. Goetz, P. Collins, J. Bono, and P. Nadel-Turonski

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Quark model, Hyperon, Photon energy, Lambda, 01 natural sciences, Baryon, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, 010306 general physics
Abstract

Experimental results on the $$\Sigma^+(1189)$$ hyperon transverse polarization in photoproduction on a hydrogen target using the CLAS detector at Jefferson laboratory are presented. The $$\Sigma^+(1189)$$ was reconstructed in the exclusive reaction $$\gamma+p\rightarrow K^{0}_{S} + \Sigma^+(1189)$$ via the $$\Sigma^{+} \to p \pi^{0}$$ decay mode. The $$K^{0}_S$$ was reconstructed in the invariant mass of two oppositely charged pions with the $$\pi^0$$ identified in the missing mass of the detected $$p\pi^+\pi^-$$ final state. Experimental data were collected in the photon energy range $$E_{\gamma}$$ = 1.0-3.5 GeV ($$\sqrt{s}$$ range 1.66-2.73 GeV). We observe a large negative polarization of up to 95%. As the mechanism of transverse polarization of hyperons produced in unpolarized photoproduction experiments is still not well understood, these results will help to distinguish between different theoretical models on hyperon production and provide valuable information for the searches of missing baryon resonances.

Published
2013
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3. Measurement of theΣπphotoproduction line shapes near theΛ(1405)

Author

P. Eugenio, B. S. Ishkhanov, R. A. Schumacher, P. Collins, C. E. Taylor, F. X. Girod, C. E. Hyde, H. Hakobyan, W. Tang, M. D. Mestayer, E. Golovatch, P. Khetarpal, N. A. Baltzell, K. A. Griffioen, J. P. Ball, D. S. Carman, C. Hanretty, M. Osipenko, E. L. Isupov, D. Adikaram, M. Guidal, Barry Ritchie, R. Paremuzyan, S. Taylor, Diane Schott, Ye Tian, Michael L. Williams, P. L. Cole, A. I. Ostrovidov, K. Park, M. Holtrop, S. Stepanyan, E. Munevar, Gerard Gilfoyle, D. Protopopescu, J. W. Price, S. Pozdniakov, Avraham Klein, D. G. Ireland, Z. W. Zhao, G. Charles, M. E. McCracken, S. Tkachenko, D. Ho, B. Vernarsky, Volker D. Burkert, A. S. Biselli, I. Bedlinskiy, A. Kim, R. Dupre, N. K. Walford, M. Battaglieri, S. Strauch, S. S. Stepanyan, S. Koirala, H. Voskanyan, D. P. Watts, L. L. Pappalardo, I. Zonta, A. Celentano, R. W. Gothe, W. J. Briscoe, E. Pasyuk, N. Harrison, George Davey Smith, N. D. Kvaltine, A. Kubarovsky, K. Livingston, V. Mokeev, J. Bono, P. Nadel-Turonski, H. Y. Lu, S. Park, Jie Zhang, A. D'Angelo, W. Gohn, S. Niccolai, Sergey Kuleshov, Friedrich Klein, R. Fersch, E. Seder, S. Chandavar, T. Mineeva, Hovanes Egiyan, P. Rossi, C. Munoz Camacho, I. Niculescu, L. El Fassi, S. Fegan, N. Pivnyuk, R. Nasseripour, P. Stoler, I. I. Strakovsky, V. P. Kubarovsky, Kei Moriya, B. Dey, C. A. Meyer, F. Sabatié, O. Pogorelko, K. Hicks, W. Kim, G. V. Fedotov, V. Crede, C. Djalali, B. McKinnon, Y. Ilieva, G. Niculescu, S. Procureur, Nicholas Zachariou, A. Deur, R. A. Montgomery, G. Rosner, M. Taiuti, Dustin Keller, E. Voutier, N. Markov, D. Rimal, K. P. Adhikari, D. P. Weygand, S. Pisano, C. S. Nepali, K. Hafidi, M. Mirazita, N. Dashyan, E. Phelps, N. Gevorgyan, V. Batourine, M. Bellis, J. J. Phillips, I. J. D. MacGregor, Elton Smith, M. Ripani, H. Seraydaryan, Y. G. Sharabian, Martin K. Mayer, M. S. Saini, M. Khandaker, D. Doughty, J. A. Fleming, D. Heddle, B. Torayev, A. V. Vlassov, K. L. Giovanetti, R. De Vita, S. Anefalos Pereira, E. De Sanctis, M. Aghasyan, D. I. Sober, M. Ungaro, S. Boiarinov, J. T. Goetz, Lorenzo Zana, H. S. Jo, and C. Salgado

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Quark model, Sigma, Lambda, 01 natural sciences, Baryon, Amplitude, Isospin, 0103 physical sciences, Invariant mass, Production (computer science), Atomic physics, 010306 general physics
Abstract

The reaction {gamma} + p -> K{sup +} + {Sigma} + {p}i was used to determine the invariant mass distributions or "line shapes" of the {Sigma}{sup +} {pi}{sup -}, {Sigma}{sup -} {pi}{sup +} and {Sigma}{sup 0} {pi}{sup 0} final states, from threshold at 1328 MeV/c^2 through the mass range of the {Lambda}(1405) and the {Lambda}(1520). The measurements were made with the CLAS system at Jefferson Lab using tagged real photons, for center-of-mass energies 1.95 < W < 2.85 GeV. The three mass distributions differ strongly in the vicinity of the I=0 {Lambda}(1405), indicating the presence of substantial I=1 strength in the reaction. Background contributions to the data from the {Sigma}{sup 0}(1385) and from K* {Sigma} production were studied and shown to have negligible influence. To separate the isospin amplitudes, Breit-Wigner model fits were made that included channel-coupling distortions due to the Nkbar threshold. A best fit to all the data was obtained after including a phenomenological I=1, J{sup P} = 1/2{sup -} amplitude with a centroid at 1394\pm20 MeV/c^2 and a second I=1 amplitude at 1413\pm10 MeV/c^2. The centroid of the I=0 {Lambda}(1405) strength was found at the {Sigma} {pi} threshold, with the observed shape determined largely by channel-coupling, leadingmore » to an apparent overall peak near 1405 MeV/c^2.« less

Published
2013
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4. Separated structure functions for exclusiveK+ΛandK+Σ0electroproduction at 5.5 GeV measured with CLAS

Author

N. A. Baltzell, E. De Sanctis, M. Aghasyan, H. Y. Lu, M. D. Mestayer, S. Strauch, G. Charles, D. I. Sober, O. Cortes, E. L. Isupov, Ye Tian, S. Procureur, Y. Prok, M. Ungaro, Eugene Pasyuk, D. P. Watts, P. Stoler, F. X. Girod, S. Boiarinov, M. Anghinolfi, H. Seraydaryan, M. Contalbrigo, V. P. Kubarovsky, D. Doughty, C. Hanretty, A. Fradi, Y. G. Sharabian, M. Ripani, I. Niculescu, R. De Vita, A. El Alaoui, V. Mokeev, O. Pogorelko, K. Joo, J. T. Goetz, K. Hicks, D. Heddle, J. W. Price, S. Anefalos Pereira, M. Y. Gabrielyan, Andrew Puckett, Martin K. Mayer, Dustin Keller, C. Munoz Camacho, J. P. Ball, S. Lewis, R. A. Schumacher, D. S. Carman, S. Pisano, B. McKinnon, M. S. Saini, S. Koirala, Sergey Kuleshov, R. Dupre, Nicholas Zachariou, D. Rimal, P. L. Cole, C. Djalali, Michael Wood, I. Bedlinskiy, S. Chandavar, M. Mirazita, E. Phelps, K. Hafidi, S. Park, M. Battaglieri, N. Gevorgyan, George Davey Smith, S. Tkachenko, V. Batourine, E. Voutier, E. Seder, L. Guo, Lorenzo Zana, I. Zonta, Diane Schott, H. Avakian, A. I. Ostrovidov, K. Park, R. Nasseripour, K. Livingston, J. A. Fleming, W. Kim, N. K. Walford, T. Mineeva, N. Harrison, A. D'Angelo, S. Stepanyan, H. Hakobyan, H. S. Jo, E. Munevar, C. A. Meyer, H. Voskanyan, R. Paremuzyan, G. V. Fedotov, I. I. Strakovsky, B. Guegan, Avraham Klein, K. A. Griffioen, D. G. Ireland, Y. Ilieva, Jie Zhang, G. Niculescu, S. Fegan, W. J. Briscoe, J. Bono, P. Nadel-Turonski, V. Crede, C. Salgado, P. Eugenio, J. J. Phillips, L. El Fassi, A. Deur, M. Taiuti, K. P. Adhikari, D. Sokhan, S. Niccolai, William Brooks, Volker D. Burkert, A. S. Biselli, R. Fersch, Y. Mao, S. S. Stepanyan, P. Khetarpal, I. J. D. MacGregor, N. Dashyan, C. S. Nepali, C. E. Taylor, R. A. Montgomery, N. A. Saylor, A. Trivedi, N. D. Kvaltine, H. Baghdasaryan, W. Tang, P. Rossi, A. Celentano, R. W. Gothe, Z. W. Zhao, A. Kubarovsky, M. Osipenko, B. Vernarsky, D. Ho, D. Adikaram, M. Khandaker, M. Guidal, B. S. Ishkhanov, D. Protopopescu, D. Martinez, S. Pozdniakov, W. Gohn, M. Holtrop, Luciano Pappalardo, M. J. Amaryan, H. Moutarde, K. L. Giovanetti, G. Rosner, Larry Weinstein, F. Sabatié, G. Ricco, Friedrich Klein, Brian Raue, and A. Kim

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Structure function, Hyperon, Sigma, Polarization (waves), Lambda, 01 natural sciences, Baryon, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

We report measurements of the exclusive electroproduction of K{sup +}{Lambda} and K{sup +}{Sigma}{sup 0} final states from an unpolarized proton target using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The separated structure functions {sigma}{sub U}, {sigma}{sub LT}, {sigma}{sub TT}, and {sigma}{sub LT'} were extracted from the {Phi}-dependent differential cross sections acquired with a longitudinally polarized 5.499~GeV electron beam. The data span a broad range of momentum transfers Q{sup 2} from 1.4 to 3.9 GeV{sup 2}, invariant energy W from threshold to 2.6 GeV, and nearly the full center-of-mass angular range of the kaon. The separated structure functions provide an unprecedented data sample, which in conjunction with other meson photo- and electroproduction data, will help to constrain the higher-level analyses being performed to search for missing baryon resonances.

Published
2013
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5. Hard Two-body Photodisintegration of 3He

Author

G. Niculescu, N. Dashyan, D. Protopopescu, E. Cisbani, S. Pozdniakov, G. Rosner, S. Tkachenko, C. Djalali, Yujie Qiang, C. S. Nepali, X. Yan, Idaykis Rodriguez, F. X. Girod, Yordanka Ilieva, L. Guo, Andrew Puckett, G. Charles, Yingxiao Wang, H. Baghdasaryan, Victor Mokeev, S. Beck, Martin K. Mayer, M. S. Saini, Nikolaos Sparveris, X. Zhan, E. Voutier, J. A. Fleming, Ronald Gilman, E. L. Isupov, J. T. Goetz, E. De Sanctis, Dustin Keller, E. Piasetzky, Diane Schott, R. Shneor, G. Ricco, C. W. de Jager, W. Tang, Franco Garibaldi, M. Aghasyan, A. I. Ostrovidov, K. Park, G. G. Petratos, Bryan J. Moffit, Michael Wood, K. Hafidi, T. Mineeva, N. Harrison, A. Deur, Barry Ritchie, P. L. Cole, M. Osipenko, M. Contalbrigo, N. A. Saylor, J. Bono, P. Nadel-Turonski, S. Boiarinov, D. G. Ireland, M. Anghinolfi, H. Seraydaryan, X. Zheng, D. Doughty, I. Zonta, B. S. Ishkhanov, H. Yao, W. K. Brooks, C. E. Taylor, R. A. Schumacher, R. Dupre, N. Bubis, X. Jiang, A. El Alaoui, D. Martinez, M. Battaglieri, V. Crede, B. Lee, K. Joo, Volker D. Burkert, A. S. Biselli, George Davey Smith, D. Heddle, S. Koirala, Guy Ron, V. P. Kubarovsky, K. A. Griffioen, R. De Vita, A. Kim, E. Golovatch, A. Beck, N. A. Baltzell, O. Pogorelko, M. Ungaro, N. D. Kvaltine, Xin Qian, W. J. Briscoe, J. P. Ball, R. A. Montgomery, S. Chandavar, Y. Mao, Friedrich Klein, K. Chirapatpimol, P. Khetarpal, D. S. Carman, P. Stoler, O. Geagla, Nicholas Zachariou, A. Camsonne, S. Anefalos Pereira, Michael Vineyard, A. J. Sarty, N. K. Walford, P. Eugenio, D. G. Meekins, A. D'Angelo, H. Voskanyan, A. T. Katramatou, R. Michaels, Douglas Higinbotham, M. Taiuti, K. Hicks, C. Dutta, Vincent Sulkosky, S. Stepanyan, E. Schulte, E. Munevar, Bogdan Wojtsekhowski, D. Rimal, E. Seder, A. Fradi, B. Vernarsky, S. Lewis, M. J. Amaryan, B. Guegan, C. E. Hyde, F. Sabatié, L. El Fassi, W. U. Boeglin, G. E. Dodge, S. Procureur, R. Nasseripour, C. Munoz Camacho, H. Y. Lu, S. Fegan, R. A. Lindgren, S. Strauch, H. S. Jo, Ishay Pomerantz, J. J. LeRose, C. A. Meyer, S. Pisano, G. V. Fedotov, H. Moutarde, D. P. Watts, H. Egiyan, C. Bookwalter, F. Cusanno, K. Livingston, K. L. Giovanetti, I. Niculescu, I. J. D. MacGregor, K. P. Adhikari, D. P. Weygand, Larry Weinstein, W. Gohn, R. Paremuzyan, Jie Zhang, A. Celentano, R. W. Gothe, Z. W. Zhao, D. Ho, Emily M. McCullough, R. Subedi, D. Sokhan, M. Khandaker, B. McKinnon, B. L. Berman, J. Glister, M. Mirazita, E. Phelps, N. Gevorgyan, V. Batourine, S. Park, S. Niccolai, P. Rossi, H. Hakobyan, M. Guidal, M. Holtrop, A. Daniel, Luciano Pappalardo, S. S. Stepanyan, Mustafa Canan, Kalyan Allada, I. Bedlinskiy, A. Kubarovsky, Sergey Kuleshov, E. Khrosinkova, B. Sawatzky, M. Ripani, A. Saha, W. Kim, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), CLAS, 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
Particle physics, Photon, Nuclear Theory, FOS: Physical sciences, General Physics and Astronomy, Few-body systems, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Cross section (physics), ANGLE ELASTIC-SCATTERING, CROSS-SECTION, DEUTERON, 0103 physical sciences, medicine, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Scaling, Physics, 010308 nuclear & particles physics, medicine.anatomical_structure, Deuterium, Photodisintegration, Nucleus
Abstract

We have measured cross sections for the {gamma}+{sup 3}He->p+d reaction at photon energies of 0.4 - 1.4 GeV and a center-of-mass angle of 90 deg. We observe dimensional scaling above 0.7 GeV at this center-of-mass angle. This is the first observation of dimensional scaling in the photodisintegration of a nucleus heavier than the deuteron.

Published
2013
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6. Near-threshold neutral pion electroproduction at high momentum transfers and generalized form factors

Author

S. Tkachenko, L. Guo, E. De Sanctis, N. Harrison, M. Aghasyan, D. I. Sober, I. Zonta, A. Celentano, R. W. Gothe, F. X. Girod, G. Charles, F. Sabatié, R. A. Schumacher, W. Tang, P. Stoler, C. E. Hyde, M. Osipenko, J. T. Goetz, N. D. Kvaltine, K. Hicks, David M. Keller, M. Ungaro, D. Martinez, M. Ripani, M. Contalbrigo, W. Gohn, S. Stepanyan, T. Mineeva, P. Eugenio, C. E. Taylor, Andrew Puckett, E. Munevar, Martin K. Mayer, R. De Vita, E. Seder, H. Y. Lu, Michael Wood, K. Hafidi, W. Kim, E. Golovatch, G. Niculescu, M. Taiuti, M. S. Saini, K. Joo, R. Nasseripour, G. Ricco, P. Khetarpal, S. Niccolai, C. A. Meyer, I. Niculescu, E. L. Isupov, S. Anefalos Pereira, G. Rosner, G. V. Fedotov, S. Lewis, K. A. Griffioen, N. A. Saylor, H. Avakian, Y. Mao, S. Boiarinov, I. I. Strakovsky, K. P. Adhikari, H. Hakobyan, D. P. Weygand, R. Dupre, C. Hanretty, J. W. Price, J. Bono, M. Battaglieri, Michael Dugger, R. G. Fersch, N. K. Walford, A. Deur, Friedrich Klein, J. J. Phillips, P. Nadel-Turonski, H. Voskanyan, B. Vernarsky, Brian Raue, W. K. Brooks, I. J. D. MacGregor, S. Park, H. S. Jo, P. L. Cole, W. J. Briscoe, E. Pasyuk, George Davey Smith, Z. W. Zhao, C. Salgado, B. S. Ishkhanov, J. A. Fleming, D. Ho, I. Bedlinskiy, P. Rossi, A. D'Angelo, L. El Fassi, M. Anghinolfi, H. Seraydaryan, V. Crede, V. P. Kubarovsky, S. Koirala, C. Djalali, O. Pogorelko, Y. G. Sharabian, Victor Mokeev, R. A. Montgomery, S. Procureur, E. Phelps, Diane Schott, A. I. Ostrovidov, K. Park, D. G. Ireland, Volker D. Burkert, A. S. Biselli, A. Fradi, S. Pisano, A. Kim, N. A. Baltzell, M. Khandaker, D. Doughty, M. J. Amaryan, H. Moutarde, K. L. Giovanetti, Larry Weinstein, S. S. Stepanyan, A. Kubarovsky, D. Adikaram, M. Guidal, M. Holtrop, Luciano Pappalardo, Sergey Kuleshov, R. Paremuzyan, Gerard Gilfoyle, D. Sokhan, C. Munoz Camacho, B. McKinnon, M. Mirazita, N. Gevorgyan, V. Batourine, A. El Alaoui, Y. Ilieva, Nicholas Zachariou, D. Rimal, K. Livingston, Jie Zhang, Inna Aznauryan, S. Strauch, H. Egiyan, D. Protopopescu, S. Pozdniakov, M. Garçon, M. Y. Gabrielyan, N. Dashyan, H. Baghdasaryan, B. Guegan, S. Fegan, J. P. Ball, D. S. Carman, E. Voutier, 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), 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), CLAS, and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Structure function, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High momentum, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Near threshold, Pion, CLAS, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, SYSTEM
Abstract

We report the measurement of near threshold neutral pion electroproduction cross sections and the extraction of the associated structure functions on the proton in the kinematic range $Q^2$ from 2 to 4.5 GeV$^2$ and $W$ from 1.08 to 1.16 GeV. These measurements allow us to access the dominant pion-nucleon s-wave multipoles $E_{0+}$ and $S_{0+}$ in the near-threshold region. In the light-cone sum-rule framework (LCSR), these multipoles are related to the generalized form factors $G_1^{\pi^0 p}(Q^2)$ and $G_2^{\pi^0 p}(Q^2)$. The data are compared to these generalized form factors and the results for $G_1^{\pi^0 p}(Q^2)$ are found to be in good agreement with the LCSR predictions, but the level of agreement with $G_2^{\pi^0 p}(Q^2)$ is poor., Comment: 17 pages, 18 figures, Journal article (Physical Review C)

Published
2013
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7. Experimental study of theP11(1440)andD13(1520)resonances from the CLAS data onep→e′π+π−p′

Author

M. Contalbrigo, I. Zonta, W. Kim, Friedrich Klein, I. I. Strakovsky, M. Guidal, S. Tkachenko, Brian Raue, P. Khetarpal, L. Guo, A. Deur, M. Holtrop, W. K. Brooks, C. S. Nepali, A. Daniel, A. Kim, N. A. Baltzell, H. Moutarde, Luciano Pappalardo, P. Eugenio, C. E. Taylor, J. Ball, V. P. Kubarovsky, A. Celentano, R. W. Gothe, S. S. Stepanyan, A. El Alaoui, Y. Ilieva, V. Crede, O. Pogorelko, E. Golovatch, P. Stoler, H. Hakobyan, L. C. Smith, Nicholas Zachariou, S. Strauch, C. Hanretty, D. Sokhan, M. Anghinolfi, K. Hicks, B. S. Ishkhanov, S. Koirala, H. Seraydaryan, A. Kubarovsky, D. Rimal, W. Tang, Y. G. Sharabian, S. Procureur, K. L. Giovanetti, Z. W. Zhao, A Fradi, H. Y. Lu, I. Bedlinskiy, Michael Wood, E. Seder, H. S. Jo, K. Hafidi, B. Guegan, D. Ho, M. Ungaro, E. De Sanctis, Martin K. Mayer, M. Ripani, K. A. Griffioen, Latifa Elouadrhiri, M. Aghasyan, G. Charles, D. Martinez, Sergey Kuleshov, H. Avakian, D. I. Sober, R. Paremuzyan, C. A. Meyer, Y. Mao, M. S. Saini, G. V. Fedotov, A. Trivedi, I. J. D. MacGregor, B. McKinnon, S. Park, R. A. Schumacher, N. K. Walford, H. Voskanyan, W. J. Briscoe, N. Markov, M. Khandaker, K. P. Adhikari, S. Pisano, K. Livingston, P. Rossi, E. Pasyuk, L. Graham, M. Mirazita, R. Dupre, David M. Keller, M. Battaglieri, T. Mineeva, V. Batourine, A. I. Ostrovidov, R. De Vita, F. X. Girod, K. Park, D. Doughty, S. Stepanyan, D. G. Ireland, E. Munevar, K. Joo, Avraham Klein, E. L. Isupov, D. Protopopescu, P. L. Cole, S. Pozdniakov, Volker D. Burkert, A. S. Biselli, Ye Tian, F. Sabatié, W. Gohn, S. Anefalos Pereira, J. W. Price, D. Schott, S. Boiarinov, George Davey Smith, Michael Vineyard, A. D'Angelo, P. Nadel-Turonski, C. Salgado, Victor Mokeev, C. Djalali, N. D. Kvaltine, D. S. Carman, E. Voutier, G. Ricco, G. Rosner, S. Fegan, C. Bookwalter, N. Dashyan, and H. Baghdasaryan

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Unitarity, Proton, 010308 nuclear & particles physics, Branching fraction, Hadron, 01 natural sciences, Helicity, Excited state, 0103 physical sciences, 010306 general physics, Ground state, Ansatz
Abstract

The transition helicity amplitudes from the proton ground state to the $$P_{11}(1440)$$ and $$D_{13}(1520)$$ excited states ($$\gamma_{v}pN^*$$ electrocouplings) were determined from the analysis of nine independent one-fold differential $$\pi^{+} \pi^{-} p$$ electroproduction cross sections off a proton target, taken with CLAS at photon virtualities 0.25\enskip {\rm GeV$$^{2}$$} $

Published
2012
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8. Measurement of Exclusiveπ0Electroproduction Structure Functions and their Relationship to Transverse Generalized Parton Distributions

Author

A. Kim, R. A. Schumacher, D. Doughty, D. Heddle, L. Graham, F. X. Girod, V. Mokeev, K. A. Griffioen, Y. Mao, S. Strauch, T. A. Forest, P. Nadel-Turonski, D. P. Watts, H. Egiyan, R. P. Bennett, S. Stepanyan, E. Munevar, M. Ungaro, A. V. Vlassov, I. Zonta, Eugene Pasyuk, A. I. Ostrovidov, K. Park, S. Tkachenko, D. G. Ireland, L. Guo, A. El Alaoui, Y. Ilieva, Volker D. Burkert, C. Munoz Camacho, Andrew Puckett, Martin K. Mayer, Nicholas Zachariou, A. S. Biselli, R. De Vita, W. Gohn, K. Joo, M. Khandaker, M. S. Saini, G. Ricco, C. E. Taylor, B. McKinnon, D. Rimal, W. Tang, E. Seder, I. J. D. MacGregor, M. Osipenko, S. Procureur, G. Charles, S. Anefalos Pereira, M. J. Amaryan, M. Mirazita, N. Markov, V. Crede, Latifa Elouadrhiri, S. Pisano, K. Livingston, N. Gevorgyan, N. A. Saylor, S. E. Kuhn, D. Martinez, B. Guegan, C. A. Meyer, A. Celentano, R. W. Gothe, J. A. Fleming, Friedrich Klein, G. V. Fedotov, H. Moutarde, M. Ripani, S. Fegan, Jie Zhang, Brian Raue, R. Paremuzyan, W. Kim, K. L. Giovanetti, G. Niculescu, F. Sabatié, N. D. Kvaltine, E. De Sanctis, H. Hakobyan, C. Djalali, R. Dupre, Larry Weinstein, M. Contalbrigo, M. Battaglieri, C. Hanretty, M. Aghasyan, A. Deur, K. P. Adhikari, D. I. Sober, M. Taiuti, David M. Keller, D. P. Weygand, W. K. Brooks, H. S. Jo, D. Sokhan, C. Bookwalter, P. Stoler, J. W. Price, Michael Wood, I. Bedlinskiy, K. Hafidi, K. Hicks, D. Protopopescu, S. Pozdniakov, M. Garçon, E. Voutier, S. Koirala, G. Rosner, S. Chandavar, E. Phelps, S. Park, N. Dashyan, P. Rossi, E. L. Isupov, V. P. Kubarovsky, A. Kubarovsky, Ye Tian, George Davey Smith, A. D'Angelo, O. Pogorelko, L. El Fassi, H. Avakian, H. Baghdasaryan, S. Boiarinov, M. Guidal, M. Holtrop, A. Daniel, Luciano Pappalardo, N. K. Walford, H. Voskanyan, W. J. Briscoe, J. P. Ball, Y. Prok, D. S. Carman, S. Niccolai, B. S. Ishkhanov, Sergey Kuleshov, H. Y. Lu, P. Khetarpal, N. A. Baltzell, A. Fradi, I. Niculescu, P. Eugenio, D. Schott, T. Mineeva, C. Salgado, Z. W. Zhao, M. F. Vineyard, M. Anghinolfi, H. Seraydaryan, and Y. G. Sharabian

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Structure function, General Physics and Astronomy, Sigma, Parton, 01 natural sciences, Helicity, Transverse plane, 0103 physical sciences, Sensitivity (control systems), 010306 general physics, Nucleon, Phenomenology (particle physics)
Abstract

Exclusive $$\pi^0$$ electroproduction at a beam energy of 5.75 GeV has been measured with the Jefferson Lab CLAS spectrometer. Differential cross sections were measured at more than 1800 kinematic values in $Q^2$, $x_B$, $t$, and $$\phi_\pi$$, in the $Q^2$ range from 1.0 to 4.6 GeV$^2$$,\ $$-t$ up to 2 GeV$^2$, and $x_B$ from 0.1 to 0.58. Structure functions $$\sigma_T +\epsilon \sigma_L, \sigma_{TT}$$ and $$\sigma_{LT}$$ were extracted as functions of $t$ for each of 17 combinations of $Q^2$ and $x_B$. The data were compared directly with two handbag-based calculations including both longitudinal and transversity GPDs. Inclusion of only longitudinal GPDs very strongly underestimates $$\sigma_T +\epsilon \sigma_L$$ and fails to account for $$\sigma_{TT}$$ and $$\sigma_{LT}$$, while inclusion of transversity GPDs brings the calculations into substantially better agreement with the data. There is very strong sensitivity to the relative contributions of nucleon helicity flip and helicity non-flip processes. The results confirm that exclusive $$\pi^0$$ electroproduction offers direct experimental access to the transversity GPDs.

Published
2012
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9. Comparison of forward and backwardpppair knockout in3He(e,e′pp)n

Author

V. Crede, S. Strauch, M. Contalbrigo, M. Paolone, H. Egiyan, M. J. Amaryan, S. Niccolai, M. Taiuti, N. Dashyan, D. G. Jenkins, N. A. Saylor, S. Procureur, S. V. Kuleshov, Michael Wood, D. Sokan, B. S. Ishkhanov, K. Hafidi, W. Tang, M. Y. Gabrielyan, K. L. Giovanetti, B. McKinnon, H. S. Jo, K. A. Griffioen, M. Osipenko, Larry Weinstein, A. D'Angelo, A. Celentano, R. W. Gothe, E. Voutier, E. De Sanctis, D. Doughty, P. Khetarpal, G. Charles, S. Pisano, F. X. Girod, H. Baghdasaryan, J. Ball, A. El Alaoui, S. Chandavar, M. Aghasyan, L. El Fassi, V. Mokeev, Lorenzo Zana, M. Mirazita, J. M. Laget, S. Park, H. Moutarde, S. S. Stepanyan, K. Park, V. P. Kubarovsky, W. Gohn, D. Rimal, P. Rossi, D. I. Sober, D. G. Ireland, S. Tkachenko, H. Voskanyan, R. Dupre, N. Gevorgyan, K. Joo, M. Battaglieri, R. A. Schumacher, Volker D. Burkert, A. S. Biselli, Latifa Elouadrhiri, A. Kim, B. Zhao, W. Kim, A. Kubarovsky, G. Rosner, G. V. Fedotov, G. Niculescu, P. L. Cole, W. K. Brooks, R. Paremuzyan, W. J. Briscoe, M. Guidal, S. Pozdniakov, K. P. Adhikari, D. S. Carman, M. Khandaker, S. Stepanyan, E. Munevar, Gerard Gilfoyle, R. De Vita, G. E. Dodge, H. Y. Lu, N. D. Kvaltine, A. Daniel, I. Niculescu, Luciano Pappalardo, I. J. D. MacGregor, D. Schott, K. Hicks, C. E. Hyde, G. Ricco, Brian Raue, B. Guegan, M. Ripani, Chaden Djalali, S. E. Kuhn, Elton Smith, M. Anghinolfi, H. Seraydaryan, and M. S. Saini

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Momentum (technical analysis), Proton, 010308 nuclear & particles physics, Nuclear Theory, Momentum transfer, EMC effect, Few-body systems, 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear force, Neutron, Nuclear Experiment, 010306 general physics, Wave function
Abstract

Measuring nucleon-nucleon Short Range Correlations (SRC) has been a goal of the nuclear physics community for many years. They are an important part of the nuclear wavefunction, accounting for almost all of the high-momentum strength. They are closely related to the EMC effect. While their overall probability has been measured, measuring their momentum distributions is more difficult. In order to determine the best configuration for studying SRC momentum distributions, we measured the 3He(e,e'pp)n reaction, looking at events with high momentum protons (pp > 0.35 GeV/c) and a low momentum neutron (pn < 0.2 GeV/c). We examined two angular configurations: either both protons emitted forward or one proton emitted forward and one backward (with respect to the momentum transfer, →q). Thus, the measured relative momentum distribution of the events with one forward and one backward proton was much closer to the calculated initial-state pp relative momentum distribution, indicating that this is the preferred configuration for measuring SRC.

Published
2012
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10. Measurement of the Neutron F-2 Structure Function via Spectator Tagging with CLAS

Author

R. Dupre, M. Battaglieri, S. S. Stepanyan, W. Kim, G. Niculescu, B. Zhao, H. Avakian, F. Sabatié, H. C. Fenker, A. I. Ostrovidov, C. E. Hyde, Y. Prok, D. S. Carman, K. Park, D. G. Ireland, Latifa Elouadrhiri, T. Mineeva, M. E. Christy, Volker D. Burkert, A. S. Biselli, S. Tkachenko, S. E. Kuhn, G. V. Fedotov, S. S. Jawalkar, E. Voutier, C. E. Keppel, K. A. Griffioen, D. P. Watts, N. D. Kvaltine, I. J. D. MacGregor, W. J. Briscoe, G. E. Dodge, H. Y. Lu, A. Kim, E. Munevar, Y. Mao, Lorenzo Zana, K. P. Adhikari, D. P. Weygand, M. Khandaker, F. X. Girod, M. Contalbrigo, E. V. Hungerford, R. Ent, Dipangkar Dutta, Sergey Kuleshov, B. Guegan, S. Fegan, Alexei V. Klimenko, Hovanes Egiyan, D. Heddle, W. Tang, H. S. Jo, E. De Sanctis, A. El Alaoui, I. Niculescu, P. Bosted, N. Baillie, M. J. Amaryan, B. A. Raue, J. Domingo, A. Fradi, M. Aghasyan, D. Adikaram, John Arrington, M. Osipenko, M. Guidal, D. I. Sober, P. Khetarpal, M. S. Saini, D. Schott, W. Gohn, R. A. Schumacher, J. W. Price, C. Salgado, G. Charles, N. Dashyan, Wally Melnitchouk, M. Y. Gabrielyan, V. Crede, M. Holtrop, N. Markov, H. Moutarde, S. Pisano, Gerard Gilfoyle, A. Daniel, G. Ricco, G. Rosner, M. Ispiryan, D. Rimal, L. Graham, Michael Wood, K. Hafidi, K. L. Giovanetti, Larry Weinstein, C. Djalali, Luciano Pappalardo, S. Strauch, V. Tvaskis, H. Baghdasaryan, P. Eugenio, D. Doughty, D. Sokhan, R. De Vita, Friedrich Klein, L. Guo, M. Ungaro, M. Taiuti, Eugene Pasyuk, S. Bültmann, S. Chandavar, Andrea Celentano, S. Procureur, A. Deur, N. Kalantarians, R. W. Gothe, K. Livingston, B. McKinnon, S. Anefalos Pereira, E. Seder, M. Anghinolfi, N. Guler, Michael Vineyard, P. Stoler, Y. Ilieva, Jie Zhang, S. Stepanyan, D. Branford, B. Dey, P. M. King, Y. G. Sharabian, K. Hicks, E. Golovatch, Avraham Klein, N. Gevorgyan, E. L. Isupov, S. Niccolai, A. Ni, V. P. Kubarovsky, A. D'Angelo, S. Park, P. Rossi, P. Nadel-Turonski, L. El Fassi, William Brooks, M. Ripani, B. Morrison, P. L. Cole, D. Protopopescu, S. Pozdniakov, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), 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), CLAS, 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
Proton, Nuclear Theory, FOS: Physical sciences, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], NUCLEAR-STRUCTURE, PROTON, 01 natural sciences, Neutron time-of-flight scattering, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, High Energy Physics - Experiment (hep-ex), DUALITY, 0103 physical sciences, PION, Neutron cross section, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Scattering, Momentum transfer, INELASTIC ELECTRON-SCATTERING, STRUCTURE-FUNCTION RATIO, DEUTERON, MODEL, FORM, Deuterium, Nucleon
Abstract

We report on the first measurement of the F2 structure function of the neutron from semi-inclusive scattering of electrons from deuterium, with low-momentum protons detected in the backward hemisphere. Restricting the momentum of the spectator protons to < 100 MeV and their angles to < 100 degrees relative to the momentum transfer allows an interpretation of the process in terms of scattering from nearly on-shell neutrons. The F2n data collected cover the nucleon resonance and deep-inelastic regions over a wide range of Bjorken x for 0.65 < Q2 < 4.52 GeV2, with uncertainties from nuclear corrections estimated to be less than a few percent. These measurements provide the first determination of the neutron to proton structure function ratio F2n/F2p at 0.2 < x < 0.8 with little uncertainty due to nuclear effects., 6 pages, 3 pages

Published
2012
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11. Measurement of the generalized form factors near threshold viaγ*p→nπ+at highQ2

Author

R. Paremuzyan, Gerard Gilfoyle, R. A. Schumacher, George Davey Smith, A. D'Angelo, R. Nasseripour, L. El Fassi, I. I. Strakovsky, A. Fradi, C. Bookwalter, K. A. Griffioen, L. Graham, W. Kim, Martin K. Mayer, C. E. Hyde, M. Contalbrigo, A. Deur, N. Kalantarians, D. Sokhan, V. P. Kubarovsky, H. Hakobyan, C. Hanretty, P. Eugenio, M. Taiuti, G. Niculescu, P. L. Cole, M. S. Saini, S. Pozdniakov, W. K. Brooks, E. Munevar, B. S. Ishkhanov, B. McKinnon, O. Pogorelko, N. Markov, S. Pisano, K. Livingston, D. Doughty, E. De Sanctis, J. P. Ball, I. Bedlinskiy, Y. Prok, J. T. Goetz, S. S. Stepanyan, S. Park, S. Stepanyan, D. Heddle, D. I. Sober, D. Branford, M. Mirazita, R. Dupre, M. Battaglieri, D. S. Carman, Avraham Klein, A. I. Ostrovidov, K. Park, A. Kubarovsky, P. Rossi, W. Tang, Z. W. Zhao, P. Stoler, D. G. Ireland, E. Phelps, N. Gevorgyan, W. Gohn, V. Batourine, H. S. Jo, W. J. Briscoe, C. E. Taylor, N. D. Kvaltine, S. Chandavar, V. Crede, F. Sabatié, H. Y. Lu, A. V. Vlassov, D. G. Jenkins, Volker D. Burkert, A. S. Biselli, M. Osipenko, C. Salgado, S. E. Kuhn, E. Golovatch, N. Dashyan, G. Ricco, Y. Ilieva, B. Zhao, A. Kim, C. A. Meyer, G. V. Fedotov, Sergey Kuleshov, F. X. Girod, T. Mineeva, K. Hicks, A. El Alaoui, R. De Vita, H. Baghdasaryan, D. Adikaram, M. Guidal, P. Khetarpal, I. Niculescu, M. Ripani, S. Strauch, Nicholas Zachariou, S. Niccolai, D. P. Watts, M. Holtrop, I. J. D. MacGregor, S. Anefalos Pereira, Friedrich Klein, A. Daniel, D. Schott, Michael Wood, K. Hafidi, J. W. Price, Elton Smith, Luciano Pappalardo, M. Khandaker, D. Rimal, A. Celentano, R. W. Gothe, M. Paolone, M. Y. Gabrielyan, B. Vernarsky, M. D. Mestayer, E. L. Isupov, S. Tkachenko, K. P. Adhikari, G. Charles, D. P. Weygand, Ye Tian, G. Rosner, S. Procureur, R. P. Bennett, L. Guo, S. Boiarinov, M. Anghinolfi, H. Moutarde, K. L. Giovanetti, H. Seraydaryan, Y. G. Sharabian, Barry Ritchie, C. Djalali, E. Voutier, P. Nadel-Turonski, M. Ungaro, K. Joo, Victor Mokeev, and A. Trivedi

Subjects
Physics, Nuclear and High Energy Physics, Proton, Spectrometer, 010308 nuclear & particles physics, Momentum transfer, Form factor (quantum field theory), 01 natural sciences, Transverse plane, Light cone, 0103 physical sciences, Cathode ray, Atomic physics, Nuclear Experiment, 010306 general physics, Multipole expansion
Abstract

We report the first extraction of the pion-nucleon multipoles near the production threshold for the nπ+ channel at relatively high momentum transfer (Q2 up to 4.2 GeV2). The dominance of the s-wave transverse multipole (E0+), expected in this region, allowed us to access the generalized form factor G1 within the light-cone sum-rule (LCSR) framework as well as the axial form factor GA. The data analyzed in this work were collected by the nearly 4π CEBAF Large Acceptance Spectrometer (CLAS) using a 5.754-GeV electron beam on a proton target. The differential cross section and the π-N multipole E0+/GD were measured using two different methods, the LCSR and a direct multipole fit. The results from the two methods are found to be consistent and almost Q2 independent.

Published
2012
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12. Tensor Correlations Measured inHe3(e,e′pp)n

Author

D. Keller, M. Khandaker, B. McKinnon, G. Rosner, R. W. Gothe, V. Kuznetsov, A. Deur, N. Markov, W. K. Brooks, H. Hakobyan, J. M. Laget, M. Battaglieri, D. J. Tedeschi, I. Bedlinskiy, A. Kim, W. Kim, D. Doughty, P. Nadel-Turonski, R. P. Bennett, D. Protopopescu, Friedrich Klein, R. A. Schumacher, V. P. Kubarovsky, S. Pozdniakov, E. Voutier, E. Munevar, G. Niculescu, O. Pogorelko, S. E. Kuhn, R. Paremuzyan, C. E. Hyde, K. Joo, M. Ripani, Y. Ilieva, A. I. Ostrovidov, P. Khetarpal, S. Strauch, K. Park, Gerard Gilfoyle, G. Ricco, H. Avakian, W. Gohn, D. G. Ireland, B. Zhao, A. El Alaoui, C. S. Nepali, D. Sokhan, S. Bültmann, Volker D. Burkert, A. S. Biselli, M. Anghinolfi, N. D. Kvaltine, H. Seraydaryan, P. Konczykowski, C. Djalali, I. J. D. MacGregor, S. Stepanyan, S. Procureur, J. W. Price, R. Dupre, S. Park, B. L. Berman, J. P. Ball, K. L. Giovanetti, D. S. Carman, R. De Vita, P. Rossi, Martin K. Mayer, Avraham Klein, B. Moreno, Larry Weinstein, W. J. Briscoe, E. Pasyuk, K. A. Griffioen, H. Moutarde, K. Livingston, V. Crede, S. Anefalos Pereira, S. Niccolai, R. Dickson, C. Salgado, G. E. Dodge, H. Y. Lu, E. De Sanctis, B. Morrison, W. Tang, M. Amarian, M. Aghasyan, I. Niculescu, D. I. Sober, S. Fegan, M. Osipenko, J. McAndrew, F. Sabatié, Michael Vineyard, C. Bookwalter, Michael Wood, N. Dashyan, H. Baghdasaryan, C. Hanretty, Victor Mokeev, M. Ungaro, S. Pisano, V. Gyurjyan, P. Eugenio, M. Taiuti, Z. W. Zhao, Sergey Kuleshov, S. S. Stepanyan, M. Guidal, M. Holtrop, A. Daniel, George Davey Smith, C. E. Taylor, A. D'Angelo, L. El Fassi, L. Guo, P. Stoler, B. Dey, K. Hicks, K. Mikhailov, D. P. Watts, H. Egiyan, M. Y. Gabrielyan, Kei Moriya, C. A. Meyer, K. P. Adhikari, and D. P. Weygand

Subjects
Physics, Nuclear reaction, Particle physics, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Elementary particle, Few-body systems, 01 natural sciences, Baryon, Nuclear physics, Momentum, Pair production, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

We have measured the $^{3}\mathrm{He}(e,{e}^{\ensuremath{'}}pp)n$ reaction at an incident energy of 4.7 GeV over a wide kinematic range. We identified spectator correlated $pp$ and $pn$ nucleon pairs by using kinematic cuts and measured their relative and total momentum distributions. This is the first measurement of the ratio of $pp$ to $pn$ pairs as a function of pair total momentum ${p}_{\mathrm{tot}}$. For pair relative momenta between 0.3 and $0.5\text{ }\text{ }\mathrm{GeV}/c$, the ratio is very small at low ${p}_{\mathrm{tot}}$ and rises to approximately 0.5 at large ${p}_{\mathrm{tot}}$. This shows the dominance of tensor over central correlations at this relative momentum.

Published
2010
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