/ Experiment-HEP arXiv:0803.2367


Evidence for a Transverse Single-Spin Asymmetry in Leptoproduction of pi+pi- Pairs


Airapetian, A. (Michigan U.) ; Akopov, N. (Yerevan Phys. Inst.) ; Akopov, Z. (Yerevan Phys. Inst.) ; Andrus, A. (Illinois U., Urbana) ; Aschenauer, Elke-Caroline (DESY) ; Augustyniak, W. (Warsaw, Inst. Nucl. Studies) ; Avakian, R. (Yerevan Phys. Inst.) ; Avetissian, A. (Yerevan Phys. Inst.) ; Avetissian, E. (Frascati) ; Bacchetta, Alessandro (Regensburg U.) ; Barion, L. (INFN, Ferrara) ; Belostotski, S. (St. Petersburg, INP) ; Bianchi, N. (Frascati) ; Blok, H.P. (NIKHEF, Amsterdam) ; Bottcher, H. (DESY) ; Bonomo, C. (INFN, Ferrara) ; Borissov, A. (Glasgow U.) ; Borysenko, A. (Frascati) ; Brull, A. (Serpukhov, IHEP) ; Bryzgalov, V. (Serpukhov, IHEP) ; Capiluppi, M. (INFN, Ferrara) ; Capitani, G.P. (Frascati) ; Cisbani, E. (Rome, ISS) ; Ciullo, G. (INFN, Ferrara) ; Contalbrigo, Marco (INFN, Ferrara) ; Dalpiaz, P.F. (INFN, Ferrara) ; Deconinck, W. (Michigan U.) ; De Leo, R. (INFN, Bari) ; Demey, M. (NIKHEF, Amsterdam) ; De Nardo, L. (DESY) ; De Sanctis, E. (Frascati) ; Devitsin, E. (Lebedev Inst.) ; Diefenthaler, M. (Erlangen - Nuremberg U.) ; Di Nezza, P. (Frascati) ; Dreschler, J. (NIKHEF, Amsterdam) ; Duren, Michael (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. (NIKHEF, Amsterdam) ; Fantoni, A. (Frascati) ; Felawka, L. (TRIUMF) ; Frullani, S. (Rome, ISS) ; Funel, A. (Frascati) ; Gapienko, G. (Serpukhov, IHEP) ; Gapienko, Vladimir (Serpukhov, IHEP) ; Garibaldi, Franco (Rome, ISS) ; Gavrilov, G. (Yerevan Phys. Inst.) ; Gharibyan, Vahagn (Yerevan Phys. Inst.) ; Giordano, F. (INFN, Ferrara) ; Grebeniouk, O. (INFN, Ferrara) ; Gregor, Ingrid-Maria (DESY) ; Griffioen, K. (NIKHEF, Amsterdam) ; Guler, H. (DESY) ; Hadjidakis, C. (Frascati) ; Hartig, M. (DESY) ; Hasch, D. (Frascati) ; Hasegawa, T. (Tokyo Inst. Tech.) ; Hesselink, W.H.A. (NIKHEF, Amsterdam) ; Hill, G. (Glasgow U.) ; Hillenbrand, A. (Erlangen - Nuremberg U.) ; Hoek, Matthias (Giessen U.) ; Holler, Y. (DESY) ; Hommez, B. (Gent U.) ; Hristova, I. (DESY) ; Iarygin, G. (Dubna, JINR) ; Imazu, Y. (Tokyo Inst. Tech.) ; Ivanilov, A. (Serpukhov, IHEP) ; Izotov, A. (St. Petersburg, INP) ; Jackson, Harold E., Jr (Argonne) ; Jgoun, A. (St. Petersburg, INP) ; Kaiser, R. (Glasgow U.) ; Keri, T. (Giessen U.) ; Kinney, Edward R. (Colorado U.) ; Kisselev, A. (Colorado U.) ; Kobayashi, T. (Tokyo Inst. Tech.) ; Kopytin, M. (DESY) ; Korotkov, V. (Serpukhov, IHEP) ; Kozlov, V. (Lebedev Inst.) ; Krauss, Carsten B. (Erlangen - Nuremberg U.) ; Kravchenko, P. (St. Petersburg, INP) ; Krivokhijine, V.G. (Dubna, JINR) ; Lagamba, L. (INFN, Bari) ; Lapikas, Louk (NIKHEF, Amsterdam) ; Lenisa, Paolo (INFN, Ferrara) ; Liebing, P. (DESY) ; Linden-Levy, L.A. (Illinois U., Urbana) ; Lorenzon, Wolfgang B. (Michigan U.) ; Lu, S. (Giessen U.) ; Lu, X. (Tokyo Inst. Tech.) ; Ma, B.Q. (Peking U.) ; Maiheu, B. (Gent U.) ; Makins, Naomi C.R. (Illinois U., Urbana) ; Mao, Y. (Peking U.) ; Marianski, B. (Warsaw, Inst. Nucl. Studies) ; Marukyan, H. (Yerevan Phys. Inst.) ; Mexner, V. (NIKHEF, Amsterdam) ; Miller, C.Andy (TRIUMF) ; Miyachi, Y. (Tokyo Inst. Tech.) ; Muccifora, V. (Frascati) ; Murray, M. (Glasgow U.) ; Nagaitsev, A. (Dubna, JINR) ; Nappi, Eugenio (INFN, Bari) ; Naryshkin, Y. (St. Petersburg, INP) ; Negodaev, M. (DESY) ; Nowak, W.D. (DESY) ; Osborne, A. (Glasgow U.) ; Pappalardo, L.L. (INFN, Ferrara) ; Perez-Benito, R. (Giessen U.) ; Pickert, N. (Erlangen - Nuremberg U.) ; Raithel, M. (Erlangen - Nuremberg U.) ; Reggiani, D. (Erlangen - Nuremberg U.) ; Reimer, Paul E. (Argonne) ; Reischl, A. (NIKHEF, Amsterdam) ; Reolon, A.R. (Frascati) ; Riedl, C. (Erlangen - Nuremberg U.) ; Rith, K. (Erlangen - Nuremberg U.) ; Rock, S.E. (DESY) ; Rosner, Guenther (Glasgow U.) ; Rostomyan, A. (DESY) ; Rubacek, L. (Giessen U.) ; Rubin, J. (Illinois U., Urbana) ; Ryckbosch, D. (Gent U.) ; Salomatin, Y. (Serpukhov, IHEP) ; Sanjiev, I. (Argonne) ; 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, Michelle Dawn (INFN, Ferrara) ; Statera, M. (INFN, Ferrara) ; Steffens, E. (Erlangen - Nuremberg U.) ; Steijger, J.J.M. (NIKHEF, Amsterdam) ; Stenzel, Hasko (Giessen U.) ; Stewart, J. (DESY) ; 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, Gerard (NIKHEF, Amsterdam) ; van Haarlem, Y. (Gent U.) ; van Hulse, C. (Gent U.) ; Veretennikov, D. (St. Petersburg, INP) ; Vikhrov, V. (St. Petersburg, INP) ; Vogel, C. (Erlangen - Nuremberg U.) ; Wang, S. (Peking U.) ; Ye, Y. (Hefei, CUST) ; Ye, Z. (DESY) ; Yen, S. (TRIUMF) ; Zeiler, D. (Erlangen - Nuremberg U.) ; Zihlmann, B. (Gent U.) ; Zupranski, P. (Warsaw, Inst. Nucl. Studies)

Published in: JHEP
Year: 2008
Vol.: 0806
Page No: 017
Pages: 18

Abstract: A single-spin asymmetry was measured in the azimuthal distribution of pi+pi- pairs produced in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target. For the first time, evidence is found for a correlation between the transverse target polarization and the azimuthal orientation of the plane containing the two pions.The corresponding single-spin asymmetry is expected to be related to the product of the little-known quark transversity distribution function and an unknown naive-T-odd chiral-odd dihadron fragmentation function.

Keyword(s): Lepton-Nucleon Scattering

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