Measurement of semi-inclusive π+ electroproduction off the proton
Year: 2009
Type: article
Abstract: Semi-inclusive ${\ensuremath{\pi}}^{+}$ electroproduction on protons has been measured with the CLAS detector at Jefferson Lab. The measurement was performed on a liquid-hydrogen target using a 5.75 GeV electron beam. The complete five-fold differential cross sections were measured over a wide kinematic range including the complete range of azimuthal angles between hadronic and leptonic planes, $\ensuremath{\phi}$, enabling us to separate the $\ensuremath{\phi}$-dependent terms. Our measurements of the $\ensuremath{\phi}$-independent term of the cross section at low Bjorken $x$ were found to be in fairly good agreement with pQCD calculations. Indeed, the conventional current fragmentation calculation can account for almost all of the observed cross section, even at small ${\ensuremath{\pi}}^{+}$ momentum. The measured center-of-momentum spectra are in qualitative agreement with high-energy data, which suggests a surprising numerical similarity between the spectator diquark fragmentation in the present reaction and the antiquark fragmentation measured in ${e}^{+}{e}^{\ensuremath{-}}$ collisions. We have observed that the two $\ensuremath{\phi}$-dependent terms of the cross section are small. Within our precision the $\mathrm{cos}2\ensuremath{\phi}$ term is compatible with zero, except for the low-$z$ region, and the measured $\mathrm{cos}\ensuremath{\phi}$ term is much smaller in magnitude than the sum of the Cahn and Berger effects.
Authors: M. Osipenko, M. Ripani, G. Ricco, H. Avakian, R. De Vita, G. Adams, M. J. Amaryan, P. Ambrozewicz, M. Anghinolfi, G. Asryan, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, S. Barrow, M. Battaglieri, I. Bedlinskiy, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, A. S. Biselli, L. Blaszczyk, B. E. Bonner, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, A. Cazes, F. Ceccopieri, S. Chen, P. L. Cole, P. Collins, P. Coltharp, P. Corvisiero, D. Crabb, V. Crede, J. P. Cummings, N. Dashyan, R. De Masi, 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, V. Drozdov, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. El Fassi, L. Elouadrhiri, P. Eugenio, R. Fatemi, G. Fedotov, G. Feldman, R. J. Feuerbach, H. Funsten, M. Garçon, G. Gavalian, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, E. Golovach, A. Gonenc, C. I. O. Gordon, 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, C. Hanretty, J. Hardie, N. Hassall, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, C. E. Hyde-Wright, Y. Ilieva, A. Ilyichev, 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, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Kossov, Z. Krahn, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, S. V. Kuleshov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, Ji Li, K. Livingston, H. Y. Lu, M. MacCormick, N. Markov, P. Mattione, S. McAleer, M. McCracken, B. McKinnon, J. W. C. McNabb, B. A. Mecking, S. Mehrabyan, J. J. Melone, 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, E. Munevar, 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, A. I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. Anefalos Pereira, 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, B. G. Ritchie, G. Rosner, P. Rossi, P. D. Rubin, F. Sabatié, J. Salamanca, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, N. V. Shvedunov, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, D. Sokhan, A. Stavinsky, S. S. Stepanyan, S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, D. J. Tedeschi, U. Thoma, A. Tkabladze, S. Tkachenko, L. Todor, L. Trentadue, 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, L. Zana, J. Zhang, B. Zhao, Z. W. Zhao
Institutions: Lomonosov Moscow State University, Istituto Nazionale di Fisica Nucleare, Sezione di Genova, Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Thomas Jefferson National Accelerator Facility, Rensselaer Polytechnic Institute, Old Dominion University, Florida International University, A. Alikhanyan National Laboratory, William & Mary, Arizona State University, University of South Carolina, Florida State University, Institute for Theoretical and Experimental Physics, Carnegie Mellon University, George Washington University, Fairfield University, Rice University, Institut de Physique Nucléaire d’Orsay, University of Edinburgh, Universidad Técnica Federico Santa María, University of New Hampshire, University of Parma, Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Parma, Idaho State University, University of Virginia, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, University of Pittsburgh, University of Glasgow, Christopher Newport University, Argonne National Laboratory, University of Richmond, James Madison University, University of California, Los Angeles, Catholic University of America, Ohio University, Belarusian State University, Virginia Tech, University of Connecticut, Norfolk State University, Kyungpook National University, University of Massachusetts Amherst, California State University, Dominguez Hills, Massachusetts Institute of Technology, University of Bonn, Union College
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2000683372