/ Experiment-HEP arXiv:0901.0701


Spin Density Matrix Elements in Exclusive rho0 Electroproduction on H-1 and H-2 Targets at 27.5-GeV Beam Energy


Airapetian, A. (Michigan U.) ; Akopov, N. (Yerevan Phys. Inst.) ; Akopov, Z. (Yerevan Phys. Inst.) ; Andrus, A. (Illinois U., Urbana) ; Aschenauer, E.C. (DESY, Zeuthen) ; Augustyniak, W. (Warsaw, Inst. Nucl. Studies) ; Avakian, R. (Yerevan Phys. Inst.) ; Avetissian, A. (Yerevan Phys. Inst.) ; Avetissian, E. (Frascati) ; Belostotski, S. (St. Petersburg, INP) ; Bianchi, N. (Frascati) ; Blok, H.P. (Vrije U., Amsterdam) ; Bottcher, H. (DESY, Zeuthen) ; Bonomo, C. (Ferrara U.) ; Borissov, A. (DESY, Zeuthen) ; Brull, A. (Unlisted) ; Bryzgalov, V. (Serpukhov, IHEP) ; Capiluppi, M. (Ferrara U.) ; Capitani, G.P. (Frascati) ; Cisbani, E. (Rome, ISS) ; Ciullo, G. (Ferrara U.) ; Contalbrigo, M. (Ferrara U.) ; Dalpiaz, P.F. (Ferrara U.) ; Deconinck, W. (Michigan U.) ; De Leo, R. (INFN, Bari) ; Demey, M. (NIKHEF, Amsterdam) ; De Nardo, L. (TRIUMF) ; De Sanctis, E. (Frascati) ; Diefenthaler, M. (Erlangen - Nuremberg U.) ; Di Nezza, P. (Frascati) ; Dreschler, J. (NIKHEF, Amsterdam) ; Duren, M. (Giessen U.) ; Ehrenfried, M. (Erlangen - Nuremberg U.) ; Elalaoui-Moulay, A. (Argonne) ; Elbakian, G. (Yerevan Phys. Inst.) ; Ellinghaus, F. (Colorado U.) ; Elschenbroich, U. (Gent U.) ; Fabbri, R. (DESY, Zeuthen) ; Fantoni, A. (Frascati) ; Felawka, L. (TRIUMF) ; Frullani, S. (Rome, ISS) ; Funel, A. (Frascati) ; Gabbert, D. (DESY, Zeuthen) ; Gapienko, G. (Serpukhov, IHEP) ; Gapienko, V. (Serpukhov, IHEP) ; Garibaldi, F. (Rome, ISS) ; Gavrilov, G. (TRIUMF) ; Gharibyan, V. (Yerevan Phys. Inst.) ; Giordano, F. (Ferrara U.) ; Gliske, S. (Michigan U.) ; Grebeniouk, O. (Ferrara U.) ; Gregor, I.M. (DESY, Zeuthen) ; Guler, H. (DESY, Zeuthen) ; Hadjidakis, C. (Frascati) ; Hartig, M. (DESY) ; Hasch, D. (Frascati) ; Hasegawa, T. (Tokyo Inst. Tech.) ; Hesselink, W.H.A. (Vrije U., Amsterdam) ; Hill, G. (Glasgow U.) ; Hillenbrand, A. (Erlangen - Nuremberg U.) ; Hoek, M. (Giessen U.) ; Holler, Y. (DESY) ; Hommez, B. (Gent U.) ; Hristova, I. (DESY, Zeuthen) ; Iarygin, G. (Dubna, JINR) ; Imazu, Y. (Tokyo Inst. Tech.) ; Ivanilov, A. (Serpukhov, IHEP) ; Izotov, A. (St. Petersburg, INP) ; Jackson, H.E. (Argonne) ; Jgoun, A. (St. Petersburg, INP) ; Kaiser, R. (Glasgow U.) ; Keri, T. (Giessen U.) ; Kinney, E. (Colorado U.) ; Kisselev, A. (St. Petersburg, INP) ; Kobayashi, T. (Tokyo Inst. Tech.) ; Kopytin, M. (DESY, Zeuthen) ; Korotkov, V. (Serpukhov, IHEP) ; Kozlov, V. (Lebedev Inst.) ; Kravchenko, P. (St. Petersburg, INP) ; Krivokhijine, V.G. (Dubna, JINR) ; Lagamba, L. (INFN, Bari) ; Lamb, R. (Illinois U., Urbana) ; Lapikas, L. (NIKHEF, Amsterdam) ; Lehmann, I. (Glasgow U.) ; Lenisa, P. (Ferrara U.) ; Liebing, P. (DESY, Zeuthen) ; Linden-Levy, L.A. (Illinois U., Urbana) ; Lorenzon, W. (Michigan U.) ; Lu, S. (Giessen U.) ; Lu, X. (Tokyo Inst. Tech.) ; Ma, B.-Q. (Peking U.) ; Maiheu, B. (Gent U.) ; Makins, N.C.R. (Illinois U., Urbana) ; Manaenkov, S.I. (St. Petersburg, INP) ; Mao, Y. (Peking U.) ; Marianski, B. (Warsaw, Inst. Nucl. Studies) ; Marukyan, H. (Yerevan Phys. Inst.) ; Mexner, V. (NIKHEF, Amsterdam) ; Miller, C.A. (TRIUMF) ; Miyachi, Y. (Tokyo Inst. Tech.) ; Muccifora, V. (Frascati) ; Murray, M. (Glasgow U.) ; Mussgiller, A. (Erlangen - Nuremberg U.) ; Nagaitsev, A. (Dubna, JINR) ; Nappi, E. (INFN, Bari) ; Naryshkin, Y. (St. Petersburg, INP) ; Nass, A. (Erlangen - Nuremberg U.) ; Negodaev, M. (DESY, Zeuthen) ; Nowak, W.-D. (DESY, Zeuthen) ; Osborne, A. (Glasgow U.) ; Pappalardo, L.L. (Ferrara U.) ; Perez-Benito, R. (Giessen U.) ; Pickert, N. (Erlangen - Nuremberg U.) ; Raithel, M. (Erlangen - Nuremberg U.) ; Reggiani, D. (Erlangen - Nuremberg U.) ; Reimer, P.E. (Argonne) ; Reischl, A. (NIKHEF, Amsterdam) ; Reolon, A.R. (Frascati) ; Riedl, C. (Frascati) ; Rith, K. (Erlangen - Nuremberg U.) ; Rock, S.E. (DESY) ; Rosner, G. (Glasgow U.) ; Rostomyan, A. (DESY) ; Rubacek, L. (Giessen U.) ; Rubin, J. (Illinois U., Urbana) ; Ryckbosch, D. (Gent U.) ; Salomatin, Y. (Serpukhov, IHEP) ; Sanjiev, I. (St. Petersburg, INP) ; Schafer, A. (Regensburg U.) ; Schnell, G. (Tokyo Inst. Tech.) ; Schuler, K.P. (DESY) ; Seitz, B. (Giessen U.) ; Shearer, C. (Glasgow U.) ; Shibata, T.-A. (Tokyo Inst. Tech.) ; Shutov, V. (Dubna, JINR) ; Stancari, M. (Ferrara U.) ; Statera, M. (Ferrara U.) ; Steffens, E. (Erlangen - Nuremberg U.) ; Steijger, J.J.M. (NIKHEF, Amsterdam) ; Stenzel, H. (Giessen U.) ; Stewart, J. (DESY, Zeuthen) ; Stinzing, F. (Erlangen - Nuremberg U.) ; Streit, J. (Giessen U.) ; Tait, P. (Erlangen - Nuremberg U.) ; Taroian, S. (Yerevan Phys. Inst.) ; Tchuiko, B. (Serpukhov, IHEP) ; Terkulov, A. (Lebedev Inst.) ; Trzcinski, A. (Warsaw, Inst. Nucl. Studies) ; Tytgat, M. (Gent U.) ; Vandenbroucke, A. (Gent U.) ; van der Nat, P.B. (NIKHEF, Amsterdam) ; van der Steenhoven, G. (NIKHEF, Amsterdam) ; Van Haarlem, Y. (Gent U.) ; Van Hulse, C. (Gent U.) ; Varanda, M. (DESY) ; Veretennikov, D. (St. Petersburg, INP) ; Vikhrov, V. (St. Petersburg, INP) ; Vilardi, I. (INFN, Bari) ; Vogel, C. (Erlangen - Nuremberg U.) ; Wang, S. (Peking U.) ; Yaschenko, S. (Erlangen - Nuremberg U.) ; Ye, H. (Peking U.) ; Ye, Y. (Hefei, CUST) ; Ye, Z. (DESY) ; Yen, S. (TRIUMF) ; Yu, W. (Giessen U.) ; Zeiler, D. (Erlangen - Nuremberg U.) ; Zihlmann, B. (Gent U.) ; Zupranski, P. (Warsaw, Inst. Nucl. Studies)

Published in: Eur.Phys.J.
Year: 2009
Vol.: C62
Page No: 659-695
Pages: 41

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 GeV^2 < Q^2 < 7 GeV^2, 3.0 GeV < W < 6.3 GeV, and -t < 0.4 GeV^2. 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.

Web-Page: http://inspirebeta.net/record/810392/files/fig8green.png; http://inspirebeta.net/record/810392/files/hisdfi8.png; http://inspirebeta.net/record/810392/files/hishfi8.png; http://inspirebeta.net/record/810392/files/new-rho1.png; http://inspirebeta.net/record/810392/files/paw-23sdme-9605.png; http://inspirebeta.net/record/810392/files/paw-dele-pyt-28apr8.png; http://inspirebeta.net/record/810392/files/paw-delta-q2.png; http://inspirebeta.net/record/810392/files/paw-deut9605-may8.png; http://inspirebeta.net/record/810392/files/paw-massrho-29jan8.png; http://inspirebeta.net/record/810392/files/paw-prot9605-may8.png; http://inspirebeta.net/record/810392/files/paw-q2dep-1.png; http://inspirebeta.net/record/810392/files/paw-q2dep-10.png; http://inspirebeta.net/record/810392/files/paw-q2dep-11.png; http://inspirebeta.net/record/810392/files/paw-q2dep-12.png; http://inspirebeta.net/record/810392/files/paw-q2dep-13.png; http://inspirebeta.net/record/810392/files/paw-q2dep-14.png; http://inspirebeta.net/record/810392/files/paw-q2dep-15.png; http://inspirebeta.net/record/810392/files/paw-q2dep-16.png; http://inspirebeta.net/record/810392/files/paw-q2dep-17.png; http://inspirebeta.net/record/810392/files/paw-q2dep-18.png; http://inspirebeta.net/record/810392/files/paw-q2dep-19.png; http://inspirebeta.net/record/810392/files/paw-q2dep-2.png; http://inspirebeta.net/record/810392/files/paw-q2dep-20.png; http://inspirebeta.net/record/810392/files/paw-q2dep-21.png; http://inspirebeta.net/record/810392/files/paw-q2dep-22.png; http://inspirebeta.net/record/810392/files/paw-q2dep-23.png; http://inspirebeta.net/record/810392/files/paw-q2dep-3.png; http://inspirebeta.net/record/810392/files/paw-q2dep-4.png; http://inspirebeta.net/record/810392/files/paw-q2dep-5.png; http://inspirebeta.net/record/810392/files/paw-q2dep-6.png; http://inspirebeta.net/record/810392/files/paw-q2dep-7.png; http://inspirebeta.net/record/810392/files/paw-q2dep-8.png; http://inspirebeta.net/record/810392/files/paw-q2dep-9.png; http://inspirebeta.net/record/810392/files/paw-tau-wdep.png; http://inspirebeta.net/record/810392/files/paw-tdep-1.png; http://inspirebeta.net/record/810392/files/paw-tdep-10.png; http://inspirebeta.net/record/810392/files/paw-tdep-11.png; http://inspirebeta.net/record/810392/files/paw-tdep-12.png; http://inspirebeta.net/record/810392/files/paw-tdep-13.png; http://inspirebeta.net/record/810392/files/paw-tdep-14.png; http://inspirebeta.net/record/810392/files/paw-tdep-15.png; http://inspirebeta.net/record/810392/files/paw-tdep-16.png; http://inspirebeta.net/record/810392/files/paw-tdep-17.png; http://inspirebeta.net/record/810392/files/paw-tdep-18.png; http://inspirebeta.net/record/810392/files/paw-tdep-19.png; http://inspirebeta.net/record/810392/files/paw-tdep-2.png; http://inspirebeta.net/record/810392/files/paw-tdep-20.png; http://inspirebeta.net/record/810392/files/paw-tdep-21.png; http://inspirebeta.net/record/810392/files/paw-tdep-22.png; http://inspirebeta.net/record/810392/files/paw-tdep-23.png; http://inspirebeta.net/record/810392/files/paw-tdep-3.png; http://inspirebeta.net/record/810392/files/paw-tdep-4.png; http://inspirebeta.net/record/810392/files/paw-tdep-5.png; http://inspirebeta.net/record/810392/files/paw-tdep-6.png; http://inspirebeta.net/record/810392/files/paw-tdep-7.png; http://inspirebeta.net/record/810392/files/paw-tdep-8.png; http://inspirebeta.net/record/810392/files/paw-tdep-9.png; http://inspirebeta.net/record/810392/files/paw-tpr-dele-29jan8.png; http://inspirebeta.net/record/810392/files/paw-upe-wdep.png; http://inspirebeta.net/record/810392/files/paw-upeq2-jun8.png; http://inspirebeta.net/record/810392/files/paw-upetpr-jun8.png; http://inspirebeta.net/record/810392/files/pho.png; http://inspirebeta.net/record/810392/files/planesax.png; http://inspirebeta.net/record/810392/files/rlt-04-apr9.png; http://inspirebeta.net/record/810392/files/sdme-combfit.png

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