Transverse momentum dependent distribution function h{sub 1T}{sup perpendicular} and the single spin asymmetry A{sub UT}{sup sin(3{phi}-3S)}
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
- Joint Institute for Nuclear Research, Dubna, 141980 (Russian Federation)
- Institut fuer Theoretische Physik II, Ruhr-Universitaet Bochum, D-44780 Bochum (Germany)
- RIKEN BNL Research Center, Building 510A, BNL, Upton, New York 11973 (United States)
The leading twist transverse momentum dependent parton distribution function h{sub 1T}{sup perpendicular} is studied. We review the theoretical properties of this function, and compute it in the bag model. We find in the bag model an interesting relation, and observe it to hold also in other relativistic models: The difference between helicity and transversity distributions, often said to be a 'measure of relativistic effects' in the nucleon, is related to h{sub 1T}{sup perpendicular}. This function is chirally odd and can be accessed in combination with the Collins effect in semi-inclusive deep-inelastic scattering, where it gives rise to an azimuthal single spin asymmetry proportional to sin(3{phi}-{phi}{sub S}). We discuss preliminary COMPASS data on that observable and make predictions for future experiments on various targets at JLab, COMPASS, and HERMES.
- OSTI ID:
- 21251012
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 78, Issue 11; Other Information: DOI: 10.1103/PhysRevD.78.114024; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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