Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual compton scattering

Airapetian, A. et al. (2001) Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual compton scattering. Physical Review Letters, 87(18), Art. 182001. (doi: 10.1103/PhysRevLett.87.182001)

Abstract

The beam-spin asymmetry in hard electroproduction of photons has been measured. The data have been accumulated by the HERMES experiment at DESY using the HERA 27.6 GeV longitudinally polarized positron beam and an unpolarized hydrogen-gas target. The asymmetry in the azimuthal distribution of the produced photons in the angle φ relative to the lepton scattering plane was determined with respect to the helicity state of the incoming positron beam. The beam-spin analyzing power in the sinφ moment was measured to be -0.23±0.04(stat)±0.03(syst) in the missing-mass range below 1.7 GeV. The observed asymmetry is attributed to the interference of the Bethe-Heitler and deeply virtual Compton scattering processes.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Kaiser, Professor Ralf and Seitz, Dr Bjoern
• Authors: Airapetian, A., Akopov, N., Akopov, Z., Amarian, M., Aschenauer, E., Avakian, H., Avakian, R., Avetissian, A., Avetissian, E., Bailey, P., Bains, B., Baturin, V., Baumgarten, C., Beckmann, M., Belostotski, S., Bernreuther, S., Bianchi, N., Böttcher, H., Borissov, A., Bouhali, O., Bouwhuis, M., Brack, J., Brauksiepe, S., Brückner, W., Brüll, A., Brunn, I., Bulten, H., Capitani, G., Chumney, P., Cisbani, E., Ciullo, G., Court, G., Dalpiaz, P., De Leo, R., De Nardo, L., De Sanctis, E., De Schepper, D., Devitsin, E., de Witt Huberts, P., Di Nezza, P., Düren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Ely, J., Fabbri, R., Fantoni, A., Fechtchenko, A., Felawka, L., Filippone, B., Fischer, H., Fox, B., Franz, J., Frullani, S., Gärber, Y., Garibaldi, F., Garutti, E., Gavrilov, G., Gharibyan, V., Golendukhin, A., Graw, G., Grebeniouk, O., Green, P., Greeniaus, L., Gute, A., Haeberli, W., Hafidi, K., Hartig, M., Hasch, D., Heesbeen, D., Heinsius, F., Henoch, M., Hertenberger, R., Hesselink, W., Hofman, G., Holler, Y., Holt, R., Hommez, B., Iarygin, G., Izotov, A., Jackson, H., Jgoun, A., Jung, P., Kaiser, R., Kanesaka, J., Kinney, E., Kisselev, A., Kitching, P., Kobayashi, H., Koch, N., Königsmann, K., Kolster, H., Korotkov, V., Kotik, E., Kozlov, V., Krauss, B., Krivokhijine, V., Kyle, G., Lagamba, L., Laziev, A., Lenisa, P., Liebing, P., Lindemann, T., Lorenzon, W., Maas, A., Makins, N., Marukyan, H., Masoli, F., McAndrew, M., McIlhany, K., Meissner, F., Menden, F., Meyners, N., Mikloukho, O., Miller, C., Milner, R., Muccifora, V., Mussa, R., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaeva, K., Nowak, W.-D., Oganessyan, K., O'Neill, T., Owen, B., Pate, S., Potashov, S., Potterveld, D., Raithel, M., Rakness, G., Rappoport, V., Redwine, R., Reggiani, D., Reolon, A., Rith, K., Robinson, D., Rostomyan, A., Ruh, M., Ryckbosch, D., Sakemi, Y., Sanjiev, I., Sato, F., Savin, I., Scarlett, C., Schäfer, A., Schill, C., Schmidt, F., Schnell, G., Schüler, K., Schwind, A., Seibert, J., Seitz, B., Shibata, T.-A., Shutov, V., Simani, M., Simon, A., Sinram, K., Steffens, E., Steijger, J., Stewart, J., Stösslein, U., Suetsugu, K., Taroian, S., Terkulov, A., Tessarin, S., Thomas, E., Tipton, B., Tytgat, M., Urciuoli, G., van den Brand, J., van Steenhoven, G., van Vyver, R., van Hunen, J., Vetterli, M., Vikhrov, V., Vincter, M., Visser, J., Weiskopf, C., Wendland, J., Wilbert, J., Wise, T., Yen, S., Yoneyama, S., and Zohrabian, H.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review Letters
• Publisher: American Physical Society
• ISSN: 0031-9007
• ISSN (Online): 1079-7114