Sivers asymmetries for inclusive pion and kaon production in deep-inelastic scattering
- Theory Division, Physics Department, CERN, 1211 Geneva 23 (Switzerland)
- Department of Physics, Sejong University, Seoul 143-747 (Korea, Republic of)
- CEA DAPNIA/SPhN Saclay, 91191 Gif-sur-Yvette (France)
We calculate the Sivers distribution functions induced by the final-state interaction due to one-gluon exchange in diquark models of a nucleon structure, treating the cases of scalar and axial-vector diquarks with both dipole and Gaussian form factors. We use these distribution functions to calculate the Sivers single-spin asymmetries for inclusive pion and kaon production in deep-inelastic scattering. We compare our calculations with the results of HERMES and COMPASS, finding good agreement for {pi}{sup +} production at HERMES, and qualitative agreement for {pi}{sup 0} and K{sup +} production. Our predictions for pion and kaon production at COMPASS could be probed with increased statistics. The successful comparison of our calculations with the HERMES data constitutes prima facie evidence that the quarks in the nucleon have some orbital angular momentum in the infinite-momentum frame.
- OSTI ID:
- 21325248
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 80, Issue 7; Other Information: DOI: 10.1103/PhysRevD.80.074033; (c) 2009 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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Related Subjects
ASYMMETRY
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DEEP INELASTIC SCATTERING
DIPOLES
DISTRIBUTION FUNCTIONS
FINAL-STATE INTERACTIONS
FORM FACTORS
GLUONS
KAONS PLUS
NUCLEONS
ORBITAL ANGULAR MOMENTUM
PARTICLE PRODUCTION
PIONS NEUTRAL
PIONS PLUS
QUARKS
SPIN