Quark Fragmentation Functions in a Diquark Model for Λ Production
نویسنده
چکیده
Using a simple quark-diquark model, we extract a set of unpolarized and polarized fragmentation functions for the Λ based on the available unpolarized Λ production data in ee annihilation. It is found that there is a strong SU(3) flavor symmetry breaking in the unpolarized Λ fragmentation functions and that the polarized u and d quark contributions to the polarized Λ fragmentation are positive in medium and large z region. The predictions of Λ-polarization with the obtained quark fragmentation functions are compatible with the available data on the longitudinally polarized Λ produced in ee-annihilation, polarized charged lepton deep inelastic scattering (DIS), and neutrino DIS. The spin asymmetry for the Λ production in p~ p collisions is also predicted for a future test in experiments at RHIC-BNL. PACS numbers: 14.20.Jn, 13.88.+e, 12.39.Ki, 13.60.Hb e-mail: [email protected] Mailing address
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