Double-spin asymmetry in the cross section for exclusive ρ0 production in lepton–proton scattering

Airapetian, A. et al. (2001) Double-spin asymmetry in the cross section for exclusive ρ0 production in lepton–proton scattering. Physics Letters B, 513(3-4), 301 -310. (doi:10.1016/S0370-2693(01)00639-6)

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Abstract

Evidence for a positive longitudinal double-spin asymmetry (A/sub 1//sup rho /)=0.24+or-0.11/sub stat/+or-0.02/sub syst/ in the cross section for exclusive diffractive rho /sup 0/(770) vector-meson production in polarised lepton-proton scattering was observed by the HERMES experiment. The longitudinally polarised 27.56 GeV HERA positron beam was scattered off a longitudinally polarised pure hydrogen gas target. The average invariant mass of the photon-proton system has a value of (W)=4.9 GeV, while the average negative squared four-momentum of the virtual photon is (Q/sup 2/)=1.7 GeV/sup 2/. The ratio of the present result to the corresponding spin asymmetry in inclusive deep-inelastic scattering is in agreement with an early theoretical prediction based on the generalised vector-meson dominance model.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kaiser, Professor Ralf
Authors: Airapetian, A., Akopov, N., Akopov, Z., Amarian, M., Arrington, J., Aschenauer, E.C., Avakian, H., Avakian, R., Avetissian, A., Avetissian, E., Bailey, P., Bains, B., Baumgarten, C., Beckmann, M., Belostotski, S., Bernreuther, S., Bianchi, N., Bottcher, H., Borissov, A., Bouwhuis, M., Brack, J., Brauksiepe, S., Braun, B., Bruckner, W., Brull, A., Budz, P., Bulten, H.J., Capitani, G.P., Carter, P., Chumney, P., Cisbani, E., Court, G.R., Dalpiaz, P.F., De Leo, R., De Nardo, L., De Sanctis, E., De Schepper, D., Devitsin, E., Witt Huberts, P.K.A., Di Nezza, P., Djordjadze, V., Duren, M., Dvoredsky, A., Elbakian, G., Ely, J., Fantoni, A., Fechtchenko, A., Felawka, L., Ferro-Luzzi, M., Fiedler, K., Filippone, B.W., Fischer, H., Fox, B., Franz, J., Frullani, S., Garber, Y., Garibaldi, F., Garutti, E., Gavrilov, G., Gharibyan, V., Golendukhin, A., Graw, G., Grebeniouk, O., Green, P.W., Greeniaus, L.G., Gute, A., Haeberli, W., Hartig, M., Hasch, D., Heesbeen, D., Heinsius, F.H., Henoch, M., Hertenberger, R., Hesselink, W., Hofman, G., Holler, Y., Holt, R.J., Hommez, B., Iarygin, G., Iodice, M., Izotov, A., Jackson, H.E., Jgoun, A., Jung, P., Kaiser, R., Kanesaka, J., Kinney, E., Kisselev, A., Kitching, P., Kobayashi, H., Koch, N., Konigsmann, K., Kolster, H., Korotkov, V., Kotik, E., Kozlov, V., Krivokhijine, V.G., Kyle, G., Lagamba, L., Laziev, A., Lenisa, P., Lindemann, T., Lorenzon, W., Makins, N.C.R., Martin, J.W., Marukyan, H., Masoli, F., McAndrew, M., McIlhany, K., Mckeown, R.D., Meissner, F., Menden, F., Metz, A., Meyners, N., Mikloukho, O., Miller, C.A., Milner, R., Muccifora, V., Mussa, R., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaeva, K., Nowak, W.D., Oganessyan, K., O'Neill, T.G., Openshaw, R., Ouyang, J., Owen, B.R., Pate, S.F., Potashov, S., Potterveld, D.H., Rakness, G., Rappoport, V., Redwine, R., Reggiani, D., Reolon, A.R., Ristinen, R., Rith, K., Robinson, D., Rostomyan, A., Ruh, M., Ryckbosch, D., Sakemi, Y., Sato, F., Savin, I., Scarlett, C., Schafer, A., Schill, C., Schmidt, F., Schnell, G., Schuler, K.P., Schwind, A., Seibert, J., Seitz, B., Shibata, T.A., Shin, T., Shutov, V., Simani, C., Simon, A., Sinram, K., Steffens, E., Steijger, J.J.M., Stewart, J., Stosslein, U., Suetsugu, K., Sutter, M., Szymanowski, L., Taroian, S., Terkulov, A., Teryaev, O., Tessarin, S., Thomas, E., Tipton, B., Tytgat, M., Urciuoli, G.M., van den Brand, J.F.J., van der Steenhoven, G., Van de Vyver, R., van Hunen, J.J., Vetterli, M.C., Vikhrov, V., Vincter, M.G., Visser, J., Volk, E., Weiskopf, C., Wendland, J., Wilbert, J., Wise, T., Yen, S., Yoneyama, S., and Zohrabian, H.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physics Letters B
Publisher:Elsevier BV
ISSN:0370-2693
ISSN (Online):1873-2445
Copyright Holders:Copyright © 2001 Elsevier Science B.V
First Published:First published in Physics Letters B 513(3-4): 301-310
Publisher Policy:Reproduced with the permission of the publisher

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