Measurement of azimuthal asymmetries with respect to both beam charge and transverse target polarization in exclusive electroproduction of real photons

A. Airapetian, N. Akopov, Z. Akopov, A. Andrus, E. C. Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, L. Barion, S. Belostotski, N. Bianchi, H. P. Blok, H. Böttcher, C. Bonomo, A. Borissov, A. Brüll, V. Bryzgalov, J. Burns, M. CapiluppiG. P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, P. F. Dalpiaz, W. Deconinck, R. De Leo, M. Demey, L. De Nardo, E. De Sanctis, M. Diefenthaler, P. Di Nezza, J. Dreschler, M. Düren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, U. Elschenbroich, R. Fabbri, A. Fantoni, L. Felawka, S. Frullani, A. Funel, D. Gabbert, G. Gapienko, V. Gapienko, F. Garibaldi, G. Gavrilov, V. Gharibyan, F. Giordano, S. Gliske, H. Guler, C. Hadjidakis, D. Hasch, T. Hasegawa, G. Hill, A. Hillenbrand, M. Hoek, Y. Holler, I. Hristova, G. Iarygin, Y. Imazu, A. Ivanilov, A. Izotov, H. E. Jackson, A. Jgoun, S. Joosten, R. Kaiser, T. Keri, E. Kinney, A. Kisselev, M. Kopytin, V. Korotkov, V. Kozlov, P. Kravchenko, V. G. Krivokhijine, L. Lagamba, R. Lamb, L. Lapikás, I. Lehmann, P. Lenisa, L. A. Linden-Levy, W. Lorenzon, S. Lu, X. Lu, B. Q. Ma, D. Mahon, B. Maiheu, N. C.R. Makins, Y. Mao, B. Marianski, H. Marukyan, C. A. Miller, Y. Miyachi, V. Muccifora, M. Murray, A. Mussgiller, A. Nagaitsev, E. Nappi, Y. Naryshkin, A. Nass, M. Negodaev, W. D. Nowak, A. Osborne, L. L. Pappalardo, R. Perez-Benito, N. Pickert, M. Raithel, P. E. Reimer, A. Reischl, A. R. Reolon, C. Riedl, K. Rith, S. E. Rock, G. Rosner, A. Rostomyan, L. Rubacek, J. Rubin, A. L. Ruiz, D. Ryckbosch, Y. Salomatin, I. Sanjiev, A. Schäfer, G. Schnell, K. P. Schüler, B. Seitz, C. Shearer, T. A. Shibata, V. Shutov, M. Stancari, M. Statera, E. Steffens, J. J.M. Steijger, H. Stenzel, J. Stewart, F. Stinzing, P. Tait, S. Taroian, A. Terkulov, A. Trzcinski, M. Tytgat, A. Vandenbroucke, P. B. Van Der Nat, G. Van Der Steenhoven, Y. Van Haarlem, C. Van Hulse, M. Varanda, D. Veretennikov, V. Vikhrov, I. Vilardi, C. Vogel, S. Wang, S. Yaschenko, H. Ye, Z. Ye, S. Yen, W. Yu, D. Zeiler, B. Zihlmann, P. Zupranski

Research output: Contribution to journalArticle

96 Scopus citations

Abstract

Azimuthal asymmetries in exclusive electroproduction of real photons are measured for the first time with respect to transverse target polarisation, providing new constraints on Generalized Parton Distributions. From the same data set on a hydrogen target, new results for the beam-charge asymmetry are also extracted with better precision than those previously reported. By comparing model calculations with measured asymmetries attributed to the interference between the deeply virtual Compton scattering and Bethe-Heitler processes, a model-dependent constraint is obtained on the total angular momenta carried by up and down quarks in the nucleon.

Original languageEnglish (US)
Article number066
JournalJournal of High Energy Physics
Volume2008
Issue number6
DOIs
StatePublished - Jun 1 2008

Keywords

  • Lepton-Nucleon scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Airapetian, A., Akopov, N., Akopov, Z., Andrus, A., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Barion, L., Belostotski, S., Bianchi, N., Blok, H. P., Böttcher, H., Bonomo, C., Borissov, A., Brüll, A., Bryzgalov, V., Burns, J., ... Zupranski, P. (2008). Measurement of azimuthal asymmetries with respect to both beam charge and transverse target polarization in exclusive electroproduction of real photons. Journal of High Energy Physics, 2008(6), [066]. https://doi.org/10.1088/1126-6708/2008/06/066