Single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target

Airapetian, A.; Laziev, A.; Borissov, A.; Elschenbroich, U.; Ye, Z.; Vogel, C.; Hoek, M.; Augustyniak, W.; Miller, C. A.; Bottcher, H.; Lagamba, L.; Osborne, A.; Stenzel, H.; Wilbert, J.; Lu, J.; Duren, M.; Iarygin, G.; Chen, T.; Belostotski, S.; Lapikas, Louk; Di Nezza, P.; Avetissian, E.; De Sanctis, E.; Seidl, R.; Brull, A.; Stewart, J.; Blok, H. P.; Michler, T.; Ohsuga, H.; Negodaev, M.; Hristova, I.; Makins, N. C. R.; Elalaoui-Moulay, A.; Taroian, S.; Stinzing, F.; Masoli, F.; Hesselink, W. H. A.; Wang, S.; Korotkov, V.; Ye, Y.; Lorenzon, W.; Hommez, B.; Ciullo, G.; Maiheu, B.; Reolon, A. R.; van der Steenhoven, G.; Linden-Levy, L. A.; Nappi, E.; Hadjidakis, C.; Kozlov, V.; Muccifora, V.; De Leo, R.; Bryzgalov, V.; Mikloukho, O.; Marianski, B.; Liebing, P.; Marukyan, H.; Miyachi, Y.; Savin, Igor A.; Aschenauer, E. C.; Shibata, T. A.; Rostomyan, A.; Fechtchenko, A.; Shanidze, R.; Stancari, M.; Tytgat, M.; Dalpiaz, P. F.; Salomatin, Y.; Kaiser, R.; Schuler, K. P.; Ryckbosch, D.; Frullani, S.; Mao, Y.; Kobayashi, T.; Capitani, G. P.; Cappiluppi, M.; Kisselev, A.; Zihlmann, B.; Volmer, J.; Ellinghaus, F.; Shearer, C.; Contalbrigo, M.; Jackson, H. E.; Pickert, N.; Henoch, M.; Nass, A.; Jgoun, A.; Rubacek, L.; Zupranski, P.; Raithel, M.; Tanaka, H.; Vandenbroucke, A.; Nagaitsev, A.; Balin, D.; Gapienko, V.; Shutov, V.; Statera, M.; De Nardo, L.; Elbakian, G.; Ivanilov, A.; Reggiani, D.; Wendland, J.; Rith, K.; Hasch, D.; Seele, J.; Rosner, G.; Avetissian, A.; Akopov, Z.; Ehrenfried, M.; Hartig, M.; Mexner, V.; Steffens, E.; Kinney, E.; Reimer, P. E.; Felawka, L.; Potterveld, D. H.; Naryshkin, Y.; Beckmann, M.; van Haarlem, Y.; Ilyichev, A.; Krauss, B.; Grebeniouk, O.; Schafer, A.; Bouwhuis, M.; Hafidi, K.; Ma, B. Q.; Kopytin, M.; Gapienko, G.; Nowak, W. D.; Vikhrov, V.; Garrow, K.; Garibaldi, F.; Rubin, J.; Meyners, N.; Lu, H.; Reischl, A.; Lu, S.; Fantoni, A.; Devitsin, E.; van der Nat, P. B.; Sinram, K.; Tchuiko, B.; Krivokhijine, V. G.; Fabbri, R.; Seitz, B.; Sanjiev, I.; Hillenbrand, A.; Borysenko, A.; Sommer, W.; Vetterli, M. C.; Ybeles Smit, G.; Lenisa, P.; Schnell, G.; Schill, C.; Izotov, A.; Tait, P.; Gharibyan, V.; Vincter, M. G.; Gavrilov, G.; HERMES Collaboration; Riedl, C.; Akopov, N.; Demey, M.; Trzcinski, A.; Bacchetta, A.; Bianchi, N.; Bailey, P.; Gregor, I. M.; Andrus, A.; Yen, S.; Terkulov, A.; Steijger, J. J. M.; Oganessyan, K.; Avakian, R.; Holler, Y.; Amarian, M.

doi:10.1103/PhysRevLett.94.012002

Report/Journal Article

PUBDB-2017-06798

Single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target

Airapetian, A. ; Akopov, N. ; Akopov, Z. ; Amarian, M. ; Andrus, A. ; Aschenauer, E. C. ; Augustyniak, W. ; Avakian, R. ; Avetissian, A. ; Avetissian, E. ; Bacchetta, A. ; Bailey, P. ; Balin, D. ; Beckmann, M. ; Belostotski, S. ; Bianchi, N. ; Blok, H. P. ; Bottcher, H. ; Borissov, A. ; Borysenko, A. ; Bouwhuis, M. ; Brull, A. ; Bryzgalov, V. ; Capitani, G. P. ; Cappiluppi, M. ; Chen, T. ; Ciullo, G. ; Contalbrigo, M. ; Dalpiaz, P. F. ; De Leo, R. ; Demey, M. ; De Nardo, L. ; De Sanctis, E. ; Devitsin, E. ; Di Nezza, P. ; Duren, M. ; Ehrenfried, M. ; Elalaoui-Moulay, A. ; Elbakian, G. ; Ellinghaus, F. ; Elschenbroich, U. ; Fabbri, R. ; Fantoni, A. ; Fechtchenko, A. ; Felawka, L. ; Frullani, S. ; Gapienko, G. ; Gapienko, V. ; Garibaldi, F. ; Garrow, K. ; Gavrilov, G. ; Gharibyan, V. ; Grebeniouk, O. ; Gregor, I. M. ; Hadjidakis, C. ; Hafidi, K. ; Hartig, M. ; Hasch, D. ; Henoch, M. ; Hesselink, W. H. A. ; Hillenbrand, A. ; Hoek, M. ; Holler, Y. ; Hommez, B. ; Hristova, I. ; Iarygin, G. ; Ilyichev, A. ; Ivanilov, A. ; Izotov, A. ; Jackson, H. E. ; Jgoun, A. ; Kaiser, R. ; Kinney, E. ; Kisselev, A. ; Kobayashi, T. ; Kopytin, M. ; Korotkov, V. ; Kozlov, V. ; Krauss, B. ; Krivokhijine, V. G. ; Lagamba, L. ; Lapikas, L. ; Laziev, A. ; Lenisa, P. ; Liebing, P. ; Linden-Levy, L. A. ; Lorenzon, W. ; Lu, H. ; Lu, J. ; Lu, S. ; Ma, B. Q. ; Maiheu, B. ; Makins, N. C. R. ; Mao, Y. ; Marianski, B. ; Marukyan, H. ; Masoli, F. ; Mexner, V. ; Meyners, N. ; Michler, T. ; Mikloukho, O. ; Miller, C. A. ; Miyachi, Y. ; Muccifora, V. ; Nagaitsev, A. ; Nappi, E. ; Naryshkin, Y. ; Nass, A. ; Negodaev, M. ; Nowak, W. D. ; Oganessyan, K. ; Ohsuga, H. ; Osborne, A. ; Pickert, N. ; Potterveld, D. H. ; Raithel, M. ; Reggiani, D. ; Reimer, P. E. ; Reischl, A. ; Reolon, A. R. ; Riedl, C. ; Rith, K. ; Rosner, G. ; Rostomyan, A. ; Rubacek, L. ; Rubin, J. ; Ryckbosch, D. ; Salomatin, Y. ; Sanjiev, I. ; Savin, I. A. ; Schafer, A. ; Schill, C. ; Schnell, G. ; Schuler, K. P. ; Seele, J. ; Seidl, R. ; Seitz, B. ; Shanidze, R. ; Shearer, C. ; Shibata, T. A. ; Shutov, V. ; Sinram, K. ; Sommer, W. ; Stancari, M. ; Statera, M. ; Steffens, E. ; Steijger, J. J. M. ; Stenzel, H. ; Stewart, J. ; Stinzing, F. ; Tait, P. ; Tanaka, H. ; Taroian, S. ; Tchuiko, B. ; Terkulov, A. ; Trzcinski, A. ; Tytgat, M. ; Vandenbroucke, A. ; van der Nat, P. B. ; van der Steenhoven, G. ; van Haarlem, Y. ; Vetterli, M. C. ; Vikhrov, V. ; Vincter, M. G. ; Vogel, C. ; Volmer, J. ; Wang, S. ; Wendland, J. ; Wilbert, J. ; Ybeles Smit, G. ; Ye, Y. ; Ye, Z. ; Yen, S. ; Zihlmann, B. ; Zupranski, P. ; HERMES Collaboration (Collaboration author)

2005
APS College Park, Md.

Physical review letters 94(1), 012002 (2005) [10.1103/PhysRevLett.94.012002]

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.94.012002 doi:10.3204/PUBDB-2017-06798

Report No.: DESY-04-141; hep-ex/0408013

Abstract: Single-spin asymmetries for semi-inclusive electroproduction of charged pions in deep-inelastic scattering of positrons are measured for the first time with transverse target polarization. The asymmetry depends on the azimuthal angles of both the pion ($\phi$) and the target spin axis ($\phi_S$) about the virtual photon direction and relative to the lepton scattering plane. The extracted Fourier component $\pi$ is a signal of the previously unmeasured quark transversity distribution, in conjunction with the so-called Collins fragmentation function, also unknown. The Fourier component $\pi$ of the asymmetry arises from a correlation between the transverse polarization of the target nucleon and the intrinsic transverse momentum of quarks, as represented by the previously unmeasured Sivers distribution function. Evidence for both signals is observed, but the Sivers asymmetry may be affected by exclusive vector meson production

Keyword(s): positron p: deep inelastic scattering ; hydrogen: polarized target ; polarization: transverse ; pi+: electroproduction ; pi-: electroproduction ; spin: asymmetry ; angular dependence ; quark: polarization ; quark: transverse momentum ; HERMES ; experimental results ; DESY HERA Stor ; positron p --> pi positron anything ; 27.5 GeV