Phys. Rev. Lett.
103,
152002
(2009)
[5 pages]
Observation of the Naive-T-Odd Sivers Effect in Deep-Inelastic Scattering
A. Airapetian et al.
Show All Authors/Affiliations
Hide All Authors/Affiliations
A. Airapetian12,15, N. Akopov26, Z. Akopov26, E. C. Aschenauer6, W. Augustyniak25, A. Avetissian26, E. Avetisyan5, A. Bacchetta5, B. Ball15, N. Bianchi10, H. P. Blok17,24, H. Böttcher6, C. Bonomo9, A. Borissov5, V. Bryzgalov19, J. Burns13, M. Capiluppi9, G. P. Capitani10, E. Cisbani21, G. Ciullo9, M. Contalbrigo9, P. F. Dalpiaz9, W. Deconinck5,15, R. De Leo2, L. De Nardo15,5, E. De Sanctis10, M. Diefenthaler14,8, P. Di Nezza10, J. Dreschler17, M. Düren12, M. Ehrenfried12, G. Elbakian26, F. Ellinghaus4, U. Elschenbroich11, R. Fabbri6, A. Fantoni10, L. Felawka22, S. Frullani21, D. Gabbert6, G. Gapienko19, V. Gapienko19, F. Garibaldi21, V. Gharibyan26, F. Giordano5,9, S. Gliske15, C. Hadjidakis10, M. Hartig5, D. Hasch10, G. Hill13, A. Hillenbrand6, M. Hoek13, Y. Holler5, I. Hristova6, Y. Imazu23, A. Ivanilov19, H. E. Jackson1, H. S. Jo11, S. Joosten14,11, R. Kaiser13, T. Keri13,12, E. Kinney4, A. Kisselev18, V. Korotkov19, V. Kozlov16, P. Kravchenko18, L. Lagamba2, R. Lamb14, L. Lapikás17, I. Lehmann13, P. Lenisa9, L. A. Linden-Levy14, A. López Ruiz11, W. Lorenzon15, X.-G. Lu6, X.-R. Lu23, B.-Q. Ma3, D. Mahon13, N. C. R. Makins14, S. I. Manaenkov18, L. Manfré21, Y. Mao3, B. Marianski25, A. Martinez de la Ossa4, H. Marukyan26, C. A. Miller22, Y. Miyachi23, A. Movsisyan26, M. Murray13, A. Mussgiller5,8, E. Nappi2, Y. Naryshkin18, A. Nass8, M. Negodaev6, W.-D. Nowak6, L. L. Pappalardo9, R. Perez-Benito12, P. E. Reimer1, A. R. Reolon10, C. Riedl6, K. Rith8, G. Rosner13, A. Rostomyan5, J. Rubin14, D. Ryckbosch11, Y. Salomatin19, F. Sanftl20, A. Schäfer20, G. Schnell6,11, K. P. Schüler5, B. Seitz13, T.-A. Shibata23, V. Shutov7, M. Stancari9, M. Statera9, J. J. M. Steijger17, H. Stenzel12, J. Stewart6, F. Stinzing8, S. Taroian26, A. Terkulov16, A. Trzcinski25, M. Tytgat11, A. Vandenbroucke11, P. B. van der Nat17, Y. Van Haarlem11, C. Van Hulse11, M. Varanda5, D. Veretennikov18, V. Vikhrov18, I. Vilardi2, C. Vogel8, S. Wang3, S. Yaschenko6,8, H. Ye3, Z. Ye5, S. Yen22, W. Yu12, D. Zeiler8, B. Zihlmann5, and P. Zupranski25 (HERMES Collaboration)
1Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USA
2Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70124 Bari, Italy
3School of Physics, Peking University, Beijing 100871, China
4Nuclear Physics Laboratory, University of Colorado, Boulder, Colorado 80309-0390, USA
5DESY, 22603 Hamburg, Germany
6DESY, 15738 Zeuthen, Germany
7Joint Institute for Nuclear Research, 141980 Dubna, Russia
8Physikalisches Institut, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
9Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, Italy
10Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
11Department of Subatomic and Radiation Physics, University of Gent, 9000 Gent, Belgium
12Physikalisches Institut, Universität Gießen, 35392 Gießen, Germany
13Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
14Department of Physics, University of Illinois, Urbana, Illinois 61801-3080, USA
15Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
16Lebedev Physical Institute, 117924 Moscow, Russia
17National Institute for Subatomic Physics (Nikhef), 1009 DB Amsterdam, The Netherlands
18Petersburg Nuclear Physics Institute, Gatchina, Leningrad region 188300, Russia
19Institute for High Energy Physics, Protvino, Moscow region 142281, Russia
20Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany
21Istituto Nazionale di Fisica Nucleare, Sezione Roma 1, Gruppo Sanità and Physics Laboratory, Istituto Superiore di Sanità, 00161 Roma, Italy
22TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
23Department of Physics, Tokyo Institute of Technology, Tokyo 152, Japan
24Department of Physics and Astronomy, Vrije Universiteit, 1081 HV Amsterdam, The Netherlands
25Andrzej Soltan Institute for Nuclear Studies, 00-689 Warsaw, Poland
26Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 23 June 2009; published 9 October 2009
Azimuthal single-spin asymmetries of leptoproduced pions and charged kaons were measured on a transversely polarized hydrogen target. Evidence for a naive-T-odd, transverse-momentum-dependent parton distribution function is deduced from nonvanishing Sivers effects for π+, π0, and K±, as well as in the difference of the π+ and π- cross sections.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.152002
DOI:
10.1103/PhysRevLett.103.152002
PACS:
13.60.−r, 13.88.+e, 14.20.Dh, 14.65.−q
|
|
