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Measurement of single-spin azimuthal asymmetries in semi-inclusive electroproduction of pions and kaons on a longitudinally polarised deuterium target

Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1, Canada; Physics Division, Argonne National Laboratory, Argonne, IL 60439-4843, USA; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70124 Bari, Italy; Department of Physics, Peking University, Beijing 100871, PR China; Nuclear Physics Laboratory, University of Colorado, Boulder, CO 80309-0446, USA; DESY, Deutsches Elektronen-Synchrotron, 22603 Hamburg, Germany; DESY Zeuthen, 15738 Zeuthen, Germany; Joint Institute for Nuclear Research, 141980 Dubna, Russia; Physikalisches Institut, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany; Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, Italy; Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, Italy; Fakultät für Physik, Universität Freiburg, 79104 Freiburg, Germany; Department of Subatomic and Radiation Physics, University of Gent, 9000 Gent, Belgium; Physikalisches Institut, Universität Gießen, 35392 Gießen, Germany; Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom; Department of Physics, University of Illinois, Urbana, IL 61801, USA; Physics Department, University of Liverpool, Liverpool L69 7ZE, United Kingdom; Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA; Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Randall Laboratory of Physics, University of Michigan, Ann Arbor, MI 48109-1120, USA; Lebedev Physical Institute, 117924 Moscow, Russia; Sektion Physik, Universität München, 85748 Garching, Germany; Nationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), 1009 DB Amsterdam, The Netherlands; St. Petersburg Nuclear Physics Institute, St. Petersburg, 188350 Gatchina, Russia; Institute for High Energy Physics, 142284 Protvino, Moscow region, Russia; Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany; Istituto Nazionale di Fisica Nucleare, Sezione Roma 1, Gruppo Sanità and Physics Laboratory, Istituto Superiore di Sanità, 00161 Roma, Italy; Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada; TRIUMF, Vancouver, British Columbia V6T 2A3, Canada; Department of Physics, Tokyo Institute of Technology, Tokyo 152, Japan; Department of Physics and Astronomy, Vrije Universiteit, 1081 HV Amsterdam, The Netherlands; Andrzej Soltan Institute for Nuclear Studies, 00-689 Warsaw, Poland; Yerevan Physics Institute, 375036 Yerevan, Armenia
Physics Letters B DOI: 10.1016/S0370-2693(03)00566-5

ABSTRACT Single-spin asymmetries have been measured for semi-inclusive electroproduction of π+, π−, π0 and K+ mesons in deep-inelastic scattering off a longitudinally polarised deuterium target. The asymmetries appear in the distribution of the hadrons in the azimuthal angle φ around the virtual photon direction, relative to the lepton scattering plane. The corresponding analysing powers in the sinφ moment of the cross section are 0.012±0.002(stat.)±0.002(syst.) for π+, 0.006±0.003(stat.)±0.002(syst.) for π−, 0.021±0.005(stat.)±0.003(syst.) for π0 and 0.013±0.006(stat.)±0.003(syst.) for K+. The sin2φ moments are compatible with zero for all particles.

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Jun 4, 2014