Ratios of helicity amplitudes for exclusive ρ 0 electroproduction

Airapetian, A. et al. (2011) Ratios of helicity amplitudes for exclusive ρ 0 electroproduction. European Physical Journal C, 71(1609), (doi:10.1140/epjc/s10052-011-1609-2)

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Abstract

Exclusive ρ 0-meson electroproduction is studied in the HERMES experiment, using a 27.6 GeV longitudinally polarized electron/positron beam and unpolarized hydrogen and deuterium targets in the kinematic region 0.5 GeV2<Q 2<7.0 GeV2, 3.0 GeV <W<6.3 GeV, and −t′<0.4 GeV2. Real and imaginary parts of the ratios of the natural-parity-exchange helicity amplitudes T 11 ( γ∗T→ρT ), T 01 ( γ∗T→ρL ), T 10 ( γ∗L→ρT ), and T 1−1 ( γ∗−T→ρT ) to T 00 ( γ∗L→ρL ) are extracted from the data. For the unnatural-parity-exchange amplitude U 11, the ratio |U 11/T 00| is obtained. The Q 2 and t′ dependences of these ratios are presented and compared with perturbative QCD predictions.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Bowles, Ms Jennifer and Mahon, Mr David and Murray, Dr Morgan and Kaiser, Professor Ralf and Lehmann, Dr Inti and Hoek, Mr Matthias and Seitz, Dr Bjoern and Keri, Dr Tibor and Hill, Mr Gordon and Burns, Mr Jonathan and Rosner, Professor Guenther
Authors: Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Bianchi, N., Blok, H. P., Borissov, A., Bowles, J., Bryzgalov, V., Burns, J., Capiluppi, M., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., Leo, R., Nardo, L., Sanctis, E., Diefenthaler, M., Nezza, P., Düren, 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., 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., Krivokhijine, V. G., Lagamba, L., Lamb, R., Lapikás, L., Lehmann, I., Lenisa, P., Linden-Levy, L. A., López Ruiz, A., Lorenzon, W., Lu, X.-G., Lu, X.-R., Ma, B.-Q., Mahon, D., Makins, N. C. R., Manaenkov, S. I., Manfré, 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., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanftl, F., Schäfer, A., Schnell, G., Schüler, K. P., Seitz, B., Shibata, T.-A., Shutov, V., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Stinzing, F., Taroian, S., Terkulov, A., Trzcinski, A., Tytgat, M., Vandenbroucke, A., Haarlem, Y., Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Wang, S., Yaschenko, S., Yen, S., Yu, W., Zihlmann, B., and Zupranski, P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:European Physical Journal C
Publisher:Springer
ISSN:1434-6044
ISSN (Online):1434-6052
Copyright Holders:Copyright © 2011 The Authors
First Published:First published in European Physical Journal C 71(1609)
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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