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 (Impact Factor: 6.02). 06/2003; 562(2003)(3-4):182-192. 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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    European Physical Journal C 01/2007; 50(1). · 5.44 Impact Factor
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    ABSTRACT: In the semi-inclusive deep inelastic scattering of polarized leptons on a transversely polarized target eight target transverse spin-dependent azimuthal modulations are allowed. In the QCD parton model half of these asymmetries can be interpreted within the leading order approach and the other four are twist-three contributions. The first two leading twist asymmetries extracted by HERMES and COMPASS experiments are related: one to the transversity distribution and the Collins effect, the other to the Sivers distribution function. These results triggered a lot of interest in the past few years and allowed the first extractions of the transversity and the Sivers distribution functions of nucleon. The remaining six asymmetries were obtained by the COMPASS experiment using a 160 GeV/c longitudinally polarized muon beam and transversely polarized deuteron and proton targets. Here we review preliminary results from COMPASS proton data of 2007.
    Journal of Physics Conference Series 05/2011; 295(1):2046-.
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    ABSTRACT: We estimate the single-spin asymmetries (SSA) which provide the access to transversity as well as to Boer–Mulders and Sivers PDFs via investigation of the single-polarized Drell–Yan (DY) processes with pp, pD and DD collisions available to RHIC, NICA, COMPASS, and J-PARC. The feasibility of these SSA is studied with the new generator of polarized DY events. The estimations performed demonstrate that there exist kinematical regions where SSA are presumably measurable. Most useful for PDFs extraction are the limiting kinematical ranges, where one can neglect the sea PDFs contributions which occur at large values of the Bjorken variable x. It is of interest that, contrary to the Sivers PDF, the transversity PDF is presumably accessible only in a particular kinematical region. Contrary to the option with the symmetric collider mode (RHIC, NICA), this is of importance for the COMPASS experiment and the future J-PARC facility, where the fixed-target mode is available.
    European Physical Journal C 02/2009; 59(3). · 5.44 Impact Factor

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