Single-spin asymmetries measured at the HERMES experiment for pions and charged kaons in semi-inclusive deep-inelastic scattering of electrons and positrons off a transversely polarized hydrogen target, are reported. Two of them reveal clear evidences of non-zero leading-twist parton distribution functions, such as the poorly known transversity and Sivers functions, describing crucial aspects of the dynamics of quarks in a transversely polarized nucleon. Evidences of a non-zero favored and disfavored Collins fragmentation function with opposite sign are also observed.

Studies of TMDs at HERMES

PAPPALARDO, Luciano Libero
2010

Abstract

Single-spin asymmetries measured at the HERMES experiment for pions and charged kaons in semi-inclusive deep-inelastic scattering of electrons and positrons off a transversely polarized hydrogen target, are reported. Two of them reveal clear evidences of non-zero leading-twist parton distribution functions, such as the poorly known transversity and Sivers functions, describing crucial aspects of the dynamics of quarks in a transversely polarized nucleon. Evidences of a non-zero favored and disfavored Collins fragmentation function with opposite sign are also observed.
2010
Semi-inclusive DIS; Single-spin asymmetries; Transversity; TMDs
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1435510
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