Exclusive leptoproduction of real photons on a longitudinally polarised hydrogen target

Airapetian, A. et al. (2010) Exclusive leptoproduction of real photons on a longitudinally polarised hydrogen target. Journal of High Energy Physics, 2010(6), pp. 1-19. (doi: 10.1007/JHEP06(2010)019)

Abstract

Polarisation asymmetries are measured for the hard exclusive leptoproduction of real photons from a longitudinally polarised hydrogen target. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. From the data are extracted two asymmetries in the azimuthal distribution of produced real photons about the direction of the exchanged virtual photon: A_UL with respect to the target polarisation and A_LL with respect to the product of the beam and target polarisations. Results for both asymmetries are compared to the predictions from a generalised parton distribution model. The sin φ and cos(0^*φ) amplitudes observed respectively for the A_UL and A_LL asymmetries are compatible with the sizeable predictions from the model. Unexpectedly, a sin(2^*φ) modulation in the A_UL asymmetry with a magnitude similar to that of the sin φ modulation is observed.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Seitz, Dr Bjoern and Keri, Dr Tibor and Mahon, Dr David and Hill, Mr Gordon and Kaiser, Professor Ralf and Murray, Dr Morgan and Burns, Mr Jonathan and Hoek, Mr Matthias and Rosner, Professor Guenther
• Authors: Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E.C., Augustyniak, W., Avakian, R., Ball, B., Belostotski, S., Bianchi, N., Blok, H.P., Boettcher, H., Borissov, A., Bowles, J., Brodski, I., Bryzgalov, V., Burns, J., Capiluppi, M., Capitani, G.P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P.F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Dueren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Golembiovskaya, M., Hadjidakis, C., Hartig, M., Hasch, D., Hill, G., Hillenbrand, A., Hoek, M., Holler, Y., Hristova, I., Imazu, Y., Ivanilov, A., Izotov, A., Jackson, H.E., Jo, H.S., Joosten, S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Kobayashi, N., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijne, V.G., Lagamba, L., Lamb, R., Lapikas, L., Lehmann, I., Lenisa, P., Linden-Levy, L.A., Lopez-Ruiz, A., Lorenzon, W., Lu, X.-G., Lu, X.-R., Ma, B.-Q., Mahon, D., Makins, N.C.R., Manaenkov, S.I., Manfre, L., Mao, Y., Marianski, B., Martinez de la Ossa, A., Marukyan, H., Miller, C.A., Miyachi, Y., Movsisyan, A., Muccifora, V., Murray, M., Mussgiller, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W.-D., Pappalardo, L.L., Perez-Benito, R., Pickert, N., Raithel, M., Reimer, P.E., Reolon, A.R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanftl, F., Schaefer, A., Schnell, G., Schueler, K.P., Seitz, B., Shibata, T.-A., Shutov, V., Stancari, M., Statera, M., Steffens, E., Steijger, J.J.M., Stenzel, H., Stewart, J., Stinzing, F., Taroian, S., Terkulov, A., Trzcinski, A., Tytgat, M., Vandenbroucke, A., van der Nat, P.B., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Ye, H., Ye, Z., Yen, S., Yu, W., Zeiler, D., Zihlmann, B., and Zupranski, P.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Research Group: HERMES collaboration
• Journal Name: Journal of High Energy Physics
• Journal Abbr.: JHEP
• Publisher: Springer
• ISSN: 1029-8479
• ISSN (Online): 1029-8479

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