Sivers effect at HERMES, COMPASS & CLAS12
Conference
·
OSTI ID:956186
Single spin asymmetries in semi-inclusive deep-inelastic scattering off transversely polarized targets give information on, among other fascinating effects, a pseudo time-reversal odd parton distribution function, the ?Sivers function?. In this proceeding we review the extractions of this function from HERMES and COMPASS data. In particular, the HERMES pion and kaon data suggest significant contributions from sea-quarks at x ? 0.15 to the Sivers effect. We present a new fit that includes all relevant sea quark distributions and gives a statistically satisfactory overall description of the data, but does not describe well the K+ data from HERMES. We argue that measurements of the pion- and kaon Sivers effect at CLAS12, and COMPASS, will clarify the situation.
- Research Organization:
- Thomas Jefferson Lab National Accelerator Facility
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 956186
- Report Number(s):
- JLAB-THY-08-820; arXiv:0805.2137; DOE/OR/23177-0369
- Country of Publication:
- United States
- Language:
- English
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