Airapetian, A. and Akopov, N. and Akopov, Z. and Andrus, A. and Aschenauer, E. C. and Augustyniak, W. and Avakian, R. and Avetissian, A. and Avetissian, E. and Belostotski, S. and Bianchi, N. and Blok, H. P. and Boettcher, H. and Bonomo, C. and Borissov, A. and Bruell, A. and Bryzgalov, V. and Capiluppi, M. and Capitani, G. P. and Cisbani, E. and Ciullo, G. and Contalbrigo, M. and Dalpiaz, P. F. and Deconinck, W. and De Leo, R. and Demey, M. and De Nardo, L. and De Sanctis, E. and Diefenthaler, M. and Di Nezza, P. and Dreschler, J. and Dueren, M. and Ehrenfried, M. and Elalaoui-Moulay, A. and Elbakian, G. and Ellinghaus, F. and Elschenbroich, U. and Fabbri, R. and Fantoni, A. and Felawka, L. and Frullani, S. and Funel, A. and Gabbert, D. and Gapienko, G. and Gapienko, V. and Garibaldi, F. and Gavrilov, G. and Gharibyan, V. and Giordano, F. and Gliske, S. and Grebeniouk, O. and Gregor, I. M. and Guler, H. and Hadjidakis, C. and Hartig, M. and Hasch, D. and Hasegawa, T. and Hesselink, W. H. A. and Hill, G. and Hillenbrand, A. and Hoek, M. and Holler, Y. and Hommez, B. and Hristova, I. and Iarygin, G. and Imazu, Y. and Ivanilov, A. and Izotov, A. and Jackson, H. E. and Jgoun, A. and Kaiser, R. and Keri, T. and Kinney, E. and Kisselev, A. and Kobayashi, T. and Kopytin, M. and Korotkov, V. and Kozlov, V. and Kravchenko, P. and Krivokhijine, V. G. and Lagamba, L. and Lamb, R. and Lapikas, L. and Lehmann, I. and Lenisa, P. and Liebing, P. and Linden-Levy, L. A. and Lorenzon, W. and Lu, S. and Lu, X. -R. and Ma, B. -Q. and Maiheu, B. and Makins, N. C. R. and Manaenkov, S. I. and Mao, Y. and Marianski, B. and Marukyan, H. and Mexner, V. and Miller, C. A. and Miyachi, Y. and Muccifora, V. and Murray, M. and Mussgiller, A. and Nagaitsev, A. and Nappi, E. and Naryshkin, Y. and Nass, A. and Negodaev, M. and Nowak, W. -D. and Osborne, A. and Pappalardo, L. L. and Perez-Benito, R. and Pickert, N. and Raithel, M. and Reggiani, D. and Reimer, P. E. and Reischl, A. and Reolon, A. R. and Riedl, C. and Rith, K. and Rock, S. E. and Rosner, G. and Rostomyan, A. and Rubacek, L. and Rubin, J. and Ryckbosch, D. and Salomatin, Y. and Sanjiev, I. and Schaefer, A. and Schnell, G. and Schuler, K. P. and Seitz, B. and Shearer, C. and Shibata, T. -A. and Shutov, V. and Stancari, M. and Statera, M. and Steffens, J. E. and Steijger, J. J. M. and Stenzel, H. and Stewart, J. and Stinzing, F. and Streit, J. and Tait, P. and Taroian, S. and Tchuiko, B. and Terkulov, A. and Trzcinski, A. and Tytgat, M. and Vandenbroucke, A. and van der Nat, P. B. and van der Steenhoven, G. and Van Haarlem, Y. and Van Hulse, C. and Varanda, M. and Veretennikov, D. and Vikhrov, V. and Vilardi, I. and Vogel, C. and Wang, S. and Yaschenko, S. and Ye, H. and Ye, Y. and Ye, Z. and Yen, S. and Yu, W. and Zeiler, D. and Zihlmann, B. and Zupranski, P. (2009) Spin density matrix elements in exclusive rho (0) electroproduction on H-1 and H-2 targets at 27.5 GeV beam energy. EUROPEAN PHYSICAL JOURNAL C, 62 (4). pp. 659-695. ISSN 1434-6044, 1434-6052
Full text not available from this repository. (Request a copy)Abstract
Spin Density Matrix Elements (SDMEs) describing the angular distribution of exclusive rho (0) electroproduction and decay are determined in the HERMES experiment with 27.6 GeV beam energy and unpolarized hydrogen and deuterium targets. Eight (fifteen) SDMEs that are related (unrelated) to the longitudinal polarization of the beam are extracted in the kinematic region 1 < Q (2)< 7 GeV2, 3.0 < W < 6.3 GeV, and -t < 0.4 GeV2. Within the given experimental uncertainties, a hierarchy of relative sizes of helicity amplitudes is observed. Kinematic dependences of all SDMEs on Q (2) and t are presented, as well as the longitudinal-to-transverse rho (0) electroproduction cross-section ratio as a function of Q (2). A small but statistically significant deviation from the hypothesis of s-channel helicity conservation is observed. An indication is seen of a contribution of unnatural-parity-exchange amplitudes; these amplitudes are naturally generated with a quark-exchange mechanism.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VECTOR-MESON PRODUCTION; INELASTIC-SCATTERING; CROSS-SECTION; P(0) MESONS; HERA; QCD; LEPTOPRODUCTION; DISTRIBUTIONS; POLARIMETER; HYDROGEN; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Sep 2020 12:30 |
| Last Modified: | 10 Sep 2020 12:30 |
| URI: | https://pred.uni-regensburg.de/id/eprint/28621 |
Actions (login required)
 |
View Item |
