Year: 2009
Type: article
Abstract: We report measurements of the beam spin asymmetry in deeply virtual Compton scattering (DVCS) at an electron beam energy of $4.8$ GeV using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The DVCS beam spin asymmetry has been measured in a wide range of kinematics, $1.0<{Q}^{2}<2.8$ (GeV/$c$)${}^{2}$, $0.12<{x}_{B}<0.48$, and $0.1<\ensuremath{-}t<0.8$ (GeV/$c$)${}^{2}$, using the reaction $\stackrel{\ensuremath{\rightarrow}}{e}p\ensuremath{\rightarrow}{e}^{'}\mathit{pX}$. The number of $\mathrm{H}(e,{e}^{'}\ensuremath{\gamma}p)$ and $\mathrm{H}(e,{e}^{'}{\ensuremath{\pi}}^{0}p)$ events are separated in each $({Q}^{2},{x}_{B},t)$ bin by a fit to the line shape of the $\mathrm{H}(e,{e}^{'}p)X$ ${M}_{x}^{2}$ distribution. The validity of the method was studied in detail using experimental and simulated data. It was shown that with the achieved missing mass squared resolution and the available statistics, the separation of DVCS--Bethe-Heitler and ${\ensuremath{\pi}}^{0}$ events can reliably be done with less than 5% uncertainty. Also, the ${Q}^{2}$ and $t$ dependences of the $\mathrm{sin}\ensuremath{\phi}$ moments of the asymmetry are extracted and compared with theoretical calculations.
Source: Physical Review C
Authors: G. Gavalian, V. D. Burkert, L. Elouadrhiri, M. Holtrop, S. Stepanyan, D. Abrahamyan, G. Adams, M. J. Amaryan, P. Ambrozewicz, M. Anghinolfi, B. Asavapibhop, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, S. Barrow, V. Batourine, M. Battaglieri, K. Beard, I. Bedlinskiy, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, A. S. Biselli, B. E. Bonner, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, B. Carnahan, S. Chen, P. L. Cole, A. Coleman, P. Collins, P. Coltharp, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, V. Crede, J. P. Cummings, N. Dashyan, R. De Masi, R. De Vita, E. De Sanctis, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deur, K. V. Dharmawardane, K. S. Dhuga, R. Dickson, C. Djalali, G. E. Dodge, J. Donnelly, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. El Fassi, A. Empl, P. Eugenio, R. Fatemi, G. Fedotov, G. Feldman, R. J. Feuerbach, T. A. Forest, H. Funsten, M. Garçon, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, E. Golovatch, A. Gonenc, R. W. Gothe, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, L. Guo, V. Gyurjyan, C. Hadjidakis, K. Hafidi, H. Hakobyan, R. S. Hakobyan, J. Hardie, N. Hassall, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, J. Hu, M. Huertas, C. E. Hyde, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, M. M. Ito, D. Jenkins, H. S. Jo, K. Joo, H. G. Juengst, N. Kalantarians, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, M. Klusman, M. Kossov, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, S. V. Kuleshov, M. Kuznetsov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, A. C. S. Lima, K. Livingston, H. Y. Lu, K. Lukashin, M. MacCormick, J. J. Manak, N. Markov, S. McAleer, B. McKinnon, J. W. C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, T. Mibe, K. Mikhailov, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, K. Moriya, S. A. Morrow, M. Moteabbed, J. Mueller, G. S. Mutchler, P. Nadel-Turonski, J. Napolitano, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, M. R. Niroula, R. A. Niyazov, M. Nozar, G. V. O’Rielly, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. A. Philips, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, I. Popa, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, J. Salamanca, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, J. Shaw, N. V. Shvedunov, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, D. Sokhan, A. Stavinsky, S. S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, R. Suleiman, M. Taiuti, S. Taylor, D. J. Tedeschi, U. Thoma, R. Thompson, A. Tkabladze, S. Tkachenko, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, D. P. Watts, L. B. Weinstein, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, M. Yurov, L. Zana, J. Zhang, B. Zhao, Z. W. Zhao
Institutions: University of New Hampshire, Old Dominion University, Thomas Jefferson National Accelerator Facility, Kyungpook National University, Idaho State University, Rensselaer Polytechnic Institute, Florida International University, Istituto Nazionale di Fisica Nucleare, Istituto Nazionale di Fisica Nucleare, Sezione di Genova, University of Massachusetts Amherst, A. Alikhanyan National Laboratory, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, William & Mary, Arizona State University, University of South Carolina, Florida State University, James Madison University, Institute for Theoretical and Experimental Physics, Ohio University Lancaster, Ohio University, Carnegie Mellon University, George Washington University, Fairfield University, Rice University, Institut de Physique Nucléaire d’Orsay, University of Edinburgh, Catholic University of America, Systems Planning and Analysis (United States), University of Virginia, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, University of Pittsburgh, University of Glasgow, Christopher Newport University, Institut National de Physique Nucléaire et de Physique des Particules, Université Blaise Pascal, Argonne National Laboratory, Lomonosov Moscow State University, University of Richmond, University of California, Los Angeles, Institut Pascal, Virginia Tech, University of Connecticut, Norfolk State University, California State University System, California State University, Dominguez Hills, California State University, Long Beach, Massachusetts Institute of Technology, Justus-Liebig-Universität Gießen, Union College
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2020368672