/ Experiment-HEP arXiv:0704.1863


Double spin asymmetry in exclusive rho0 muoproduction at COMPASS


Alexakhin, V.Yu. (Dubna, JINR) ; Alexandrov, Yu. (Lebedev Inst.) ; Alexeev, G.D. (Dubna, JINR) ; Amoroso, A. (INFN, Turin) ; Badelek, B. (Warsaw U.) ; Balestra, F. (INFN, Turin) ; Ball, J. (Saclay) ; Baum, G. (Bielefeld U.) ; Bedfer, Y. (Saclay) ; Bernet, C. (Saclay) ; Bertini, R. (INFN, Turin) ; Birsa, R. (Trieste U.) ; Bisplinghoff, J. (Bonn U., HISKP) ; Bordalo, P. ; Bradamante, F. (Trieste U.) ; Bravar, A. (Mainz U., Inst. Kernphys.) ; Bressan, A. (Trieste U.) ; Brona, G. (Warsaw U.) ; Burtin, E. (Saclay) ; Bussa, M.P. (INFN, Turin) ; Chapiro, A. (ICTP, Trieste) ; Cicuttin, A. (ICTP, Trieste) ; Costa, S. (INFN, Turin) ; Crespo, M.L. (ICTP, Trieste) ; d'Hose, N. (Saclay) ; Dalla Torre, S. (Trieste U.) ; Dasgupta, S.S. (Burdwan U.) ; De Masi, R. (Munich, Tech. U.) ; Dedek, N. (Munich U.) ; Dhara, L. (Matrivani Inst., Calcutta) ; Diaz Kavka, V. (ICTP, Trieste) ; Dinkelbach, A.M. (Munich, Tech. U.) ; Donskov, S.V. (Serpukhov, IHEP) ; Dorofeev, V.A. (Serpukhov, IHEP) ; Doshita, N. (Nagoya U.) ; Duic, V. (Trieste U.) ; Dunnweber, W. (Munich U.) ; Eversheim, P.D. (Bonn U., HISKP) ; Eyrich, W. (Erlangen - Nuremberg U.) ; Fabro, M. (Trieste U.) ; Faessler, M. (Munich U.) ; Falaleev, V. (CERN) ; Ferrero, A. (INFN, Turin) ; Ferrero, L. (INFN, Turin) ; Finger, M. (Charles U.) ; Finger, M., Jr. (Dubna, JINR) ; Fischer, H. (Freiburg U.) ; Franz, J. (Freiburg U.) ; Friedrich, J.M. (Munich, Tech. U.) ; Garfagnini, R. (INFN, Turin) ; Gautheron, F. (Bielefeld U.) ; Gavrichtchouk, O.P. (Dubna, JINR) ; Geyer, R. (Munich U.) ; Giorgi, M. (Trieste U.) ; Gobbo, B. (Trieste U.) ; Gorin, A.M. (Serpukhov, IHEP) ; Grajek, O.A. (Warsaw U.) ; Grasso, A. (INFN, Turin) ; Grube, B. (Munich, Tech. U.) ; Hannappel, J. (Bonn U.) ; von Harrach, D. (Mainz U., Inst. Kernphys.) ; Hasegawa, T. (Miyazaki U.) ; Heckmann, J. (Ruhr U., Bochum) ; Hedicke, S. (Freiburg U.) ; Heinsius, F.H. (Freiburg U.) ; Hermann, R. (Mainz U., Inst. Kernphys.) ; Hess, C. (Ruhr U., Bochum) ; Hinterberger, F. (Bonn U., HISKP) ; von Hodenberg, M. (Freiburg U.) ; Horikawa, S. (Nagoya U.) ; Ilgner, C. (Munich U.) ; Ioukaev, A.I. (Dubna, JINR) ; Ishimoto, S. (Nagoya U.) ; Ivanov, O. (Dubna, JINR) ; Jahn, R. (Bonn U., HISKP) ; Janata, A. (Dubna, JINR) ; Joosten, R. (Bonn U., HISKP) ; Jouravlev, N.I. (Dubna, JINR) ; Kabuss, E. (Mainz U., Inst. Kernphys.) ; Kang, D. (Freiburg U.) ; Ketzer, B. (Munich, Tech. U.) ; Khaustov, G.V. (Serpukhov, IHEP) ; Khokhlov, Yu.A. (Serpukhov, IHEP) ; Khomutov, N.V. (Dubna, JINR) ; Klein, F. (Bonn U.) ; Koblitz, S. (Mainz U., Inst. Kernphys.) ; Koivuniemi, J.H. (Helsinki U.) ; Kolosov, V.N. (Serpukhov, IHEP) ; Komissarov, E.V. (Dubna, JINR) ; Kondo, K. (Nagoya U.) ; Konigsmann, Kay (Freiburg U.) ; Konstantinov, V.F. (Serpukhov, IHEP) ; Korentchenko, A.S. (Dubna, JINR) ; Korzenev, Alexandre (Mainz U., Inst. Kernphys.) ; Koutchinski, N.A. (Dubna, JINR) ; Kravchuk, N.P. (Dubna, JINR) ; Kroumchtein, Z.V. (Dubna, JINR) ; Kuhn, R. (Munich, Tech. U.) ; Kunne, F. (Saclay) ; Kurek, K. (Warsaw U.) ; Ladygin, M.E. (Serpukhov, IHEP) ; Le Goff, J.M. (Saclay) ; Lichtenstadt, J. (Tel Aviv U.) ; Liska, T. (Prague, Tech. U.) ; Ludwig, I. (Freiburg U.) ; Maggiora, A. (INFN, Turin) ; Maggiora, M. (INFN, Turin) ; Magnon, A. (Saclay) ; Mallot, G.K. (CERN) ; Marchand, C. (Saclay) ; Marroncle, J. (Saclay) ; Martin, A. (Trieste U.) ; Marzec, J. (Warsaw U. of Tech.) ; Matsuda, T. (Miyazaki U.) ; Maximov, A.N. (Dubna, JINR) ; Meyer, W. (Ruhr U., Bochum) ; Mikhailov, Yu.V. (Serpukhov, IHEP) ; Moinester, M.A. (Tel Aviv U.) ; Nahle, O. (Bonn U., HISKP) ; Nassalski, J. (Warsaw U.) ; Neliba, S. (Prague, Tech. U.) ; Neyret, D.P. (Saclay) ; Nikolaenko, V.I. (Serpukhov, IHEP) ; Nozdrin, A.A. (Dubna, JINR) ; Obraztsov, V.F. (Serpukhov, IHEP) ; Olshevsky, A.G. (Dubna, JINR) ; Ostrick, M. (Bonn U.) ; Padee, A. (Warsaw U. of Tech.) ; Pagano, P. (Trieste U.) ; Panebianco, S. (Saclay) ; Paul, S. (Munich, Tech. U.) ; Peshekhonov, D.V. (Dubna, JINR) ; Peshekhonov, V.D. (Dubna, JINR) ; Piragino, G. (INFN, Turin) ; Platchkov, S. (Saclay) ; Pochodzalla, J. (Mainz U., Inst. Kernphys.) ; Polyakov, V.A. (Serpukhov, IHEP) ; Popov, A.A. (Dubna, JINR) ; Pretz, J. (Bonn U.) ; Procureur, S. (Saclay) ; Quintans, C. (Lisbon, LIFEP) ; Ramos, S. ; Reicherz, G. (Ruhr U., Bochum) ; Rozhdestvensky, A.M. (Dubna, JINR) ; Rondio, E. (Warsaw U.) ; Sadovski, A.B. (Dubna, JINR) ; Samoylenko, V.D. (Serpukhov, IHEP) ; Sandacz, A. (Warsaw U.) ; Sapozhnikov, M.G. (Dubna, JINR) ; Savin, Igor A. (Dubna, JINR) ; Schiavon, P. (Trieste U.) ; Schill, C. (Freiburg U.) ; Schmitt, L. (Munich, Tech. U.) ; Shevchenko, O.Yu. (Dubna, JINR) ; Shishkin, A.A. (Dubna, JINR) ; Sinha, L. (Matrivani Inst., Calcutta) ; Sissakian, A.N. (Dubna, JINR) ; Slunecka, M. (Dubna, JINR) ; Smirnov, G.I. (Dubna, JINR) ; Sozzi, F. (Trieste U.) ; Sugonyaev, V.P. (Serpukhov, IHEP) ; Srnka, A. (Masaryk U., Brno) ; Stinzing, F. (Erlangen - Nuremberg U.) ; Stolarski, M. (Warsaw U.) ; Sulc, M. (Liberec Tech. U.) ; Sulej, R. (Warsaw U. of Tech.) ; Takabayashi, N. (Nagoya U.) ; Tchalishev, V.V. (Dubna, JINR) ; Tessarotto, F. (Trieste U.) ; Teufel, A. (Erlangen - Nuremberg U.) ; Tkatchev, L.G. (Dubna, JINR) ; Virius, M. (Prague, Tech. U.) ; Vlassov, N.V. (Dubna, JINR) ; Webb, R. (Erlangen - Nuremberg U.) ; Weise, E. (Bonn U., HISKP) ; Weitzel, Q. (Munich, Tech. U.) ; Windmolders, R. (Bonn U.) ; Wirth, S. (Erlangen - Nuremberg U.) ; Wislicki, W. (Warsaw U.) ; Zaremba, K. (Warsaw U. of Tech.) ; Zemlyanichkina, E. (Dubna, JINR) ; Zhao, J. (Mainz U., Inst. Kernphys.) ; Ziegler, R. (Bonn U., HISKP) ; Zvyagin, A. (Munich U.)

Published in: Eur.Phys.J.
Year: 2007
Vol.: C52
Page No: 255-265
Pages: 15

Abstract: The longitudinal double spin asymmetry A_1^rho for exclusive leptoproduction of rho^0 mesons, mu + N -> mu + N + rho, is studied using the COMPASS 2002 and 2003 data. The measured reaction is incoherent exclusive rho^0 production on polarised deuterons. The Q^2 and x dependence of A_1^rho is presented in a wide kinematical range: 3x10^-3 < Q^2 < 7 (GeV/c)^2 and 5x10^-5 < x < 0.05. The presented results are the first measurements of A_1^rho at small Q2 (Q2 < 0.1 (GeV/c)^2) and small x (x < 3x10^-3). The asymmetry is in general compatible with zero in the whole kinematical range.

Web-Page: http://weblib.cern.ch/abstract?CERN-PH-EP-2007-009; http://publish.edpsciences.org/abstract/EPJC/V52/P255

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