Single spin azimuthal asymmetries and transversity

Collaboration
for the collaboration.
May, 2003
3 pages
Published in:
  • AIP Conf.Proc. 698 (2004) 1, 621-623
Contribution to:
  • Published: Feb 25, 2004
Report number:
  • DESY-HERMES-03-23
Experiments:

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Abstract: (AIP)
Single Spin azimuthal Asymmetries (SSA) in semi‐inclusive deep‐inelastic lepton‐nucleon scattering can be generally produced by time reversal odd (T‐odd) distribution or fragmentation functions. In the case of an unpolarized positron beam and a longitudinally or transversely polarized target, SSAs can have two origins: the chiral odd transversity distribution h 1 in conjunction with the chiral odd Collins fragmentation function H 1 ⊥ and the T‐odd Sivers distribution function f 1T ⊥ in conjunction with a spin‐independent fragmentation function. In the case of a longitudinally polarized target both mechanisms contribute to the same asymmetry, whereas in case of transverse target polarisation they give rise to different angular dependences and can therefore be measured separately. The present status of HERMES data taking with a transversely polarized proton target will be presented.
  • 13.60.Hb
  • 13.88.+e
  • deep inelastic scattering
  • lepton-nucleon scattering
  • polarisation in elementary particle scattering
  • elementary particle spin
  • T invariance
  • chirality
  • symmetry
  • talk: New York 2003/05/19