Published January 4, 2010 | Version v1
Journal article Metadata-only

Single-spin azimuthal asymmetry in exclusive electroproduction of π+ mesons on transversely polarized protons

Creators

  • 1. Randall Laboratory of Physics, University of Michigan, Ann Arbor, MI 48109-1040 (United States)
  • 2. Physikalisches Institut, Universitaet Giessen, 35392 Giessen (Germany)
  • 3. Yerevan Physics Institute, 375036 Yerevan (Armenia)
  • 4. DESY, 22603 Hamburg (Germany)
  • 5. DESY, 15738 Zeuthen (Germany)
  • 6. Andrzej Soltan Institute for Nuclear Studies, 00-689 Warsaw (Poland)
  • 7. Petersburg Nuclear Physics Institute, Gatchina, Leningrad region 188300 (Russian Federation)
  • 8. Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati (Italy)
  • 9. Department of Physics, VU University, 1081 HV Amsterdam (Netherlands)
  • 10. National Institute for Subatomic Physics (Nikhef), 1009 DB Amsterdam (Netherlands)
  • 11. Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Universita di Ferrara, 44100 Ferrara (Italy)
  • 12. Institute for High Energy Physics, Protvino, Moscow region 142281 (Russian Federation)
  • 13. Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ (United Kingdom)
  • 14. Istituto Nazionale di Fisica Nucleare, Sezione Roma 1, Gruppo Sanita and Physics Laboratory, Istituto Superiore di Sanita, 00161 Roma (Italy)

Description

Exclusive electroproduction of π+ mesons was studied by scattering 27.6 GeV positrons or electrons off a transversely polarized hydrogen target. The single-spin azimuthal asymmetry with respect to target polarization was measured as a function of the Mandelstam variable t, the Bjorken scaling variable xB, and the virtuality Q2 of the exchanged photon. The extracted Fourier components of the asymmetry were found to be consistent with zero, except one that was found to be large and that involves interference of contributions from longitudinal and transverse virtual photons.

Availability note (English)

Available from http://dx.doi.org/10.1016/j.physletb.2009.11.039

Additional details

Identifiers

DOI
10.1016/j.physletb.2009.11.039;
arXiv
arXiv:0907.2596v1;
PII
S0370-2693(09)01385-9;

Publishing Information

Journal Title
Physics Letters. Section B
Journal Volume
682
Journal Issue
4-5
Journal Page Range
p. 345-350
ISSN
0370-2693
CODEN
PYLBAJ

INIS

Country of Publication
Netherlands
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
41086309
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI
ELECTRONS; ELECTROPRODUCTION; GAUGE INVARIANCE; GEV RANGE; HYDROGEN; PHOTONS; PIONS PLUS; POLARIZATION; POSITRON-ATOM COLLISIONS; POSITRONS; PROTONS; SCATTERING; SPIN
Descriptors DEC
ANGULAR MOMENTUM; ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; ATOM COLLISIONS; BARYONS; BASIC INTERACTIONS; BOSONS; COLLISIONS; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ELEMENTS; ENERGY RANGE; FERMIONS; HADRONS; INTERACTIONS; INVARIANCE PRINCIPLES; LEPTONS; MASSLESS PARTICLES; MATTER; MESONS; NONMETALS; NUCLEONS; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; PIONS; POSITRON COLLISIONS; PSEUDOSCALAR MESONS

Optional Information

Copyright
Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.