Single spin azimuthal asymmetries and transversity
May, 20033 pages
Part of Intersections of particle and nuclear physics. Proceedings, 8th Conference, CIPANP 2003, New York, USA, May 19-24, 2003, 621-623
Published in:
- AIP Conf.Proc. 698 (2004) 1, 621-623
Contribution to:
- , 621-623
- CIPANP 2003
- Published: Feb 25, 2004
DOI:
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
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