Semi-inclusive π scattering – tests for independent fragmentation and for polarized quark densities
نویسندگان
چکیده
We show that measurements of semi-inclusive π asymmetries on p and n with polarized and unpolarized target and beams allow, without any knowledge of the polarized parton densities 1) to test independent fragmentation and SU(2) symmetry for the polarized sea, and 2) to determine separately the polarized strange and valence quarks densities, and the ratio of the fragmentation functions D +π s /D π+π u .
منابع مشابه
Semi-inclusive π production – tests for independent fragmentation and for polarized quark densities
We show that measurements of semi-inclusive π asymmetries on p and n with polarized and unpolarized target and beams allow, without any knowledge of the polarized parton densities 1) to test independent fragmentation and SU(2) symmetry for the polarized sea, and 2) to determine separately the polarized strange and valence quarks densities, and the ratio of the fragmentation functions D +π s /D ...
متن کامل2 00 4 A Model Independent Approach to Semi - Inclusive Deep Inelastic Scattering
We present a method for extraction of detailed information on polarized quark densities from semi-inclusive deep inelastic scattering l +N → l + h +X, in both LO and NLO QCD without any assumptions about fragmentation functions and polarized sea densities. The only symmetries utilised are charge conjugation and isotopic spin invariance of strong interactions. 1. At present the possibility to ob...
متن کاملTransversity and inclusive two-pion production
A model for dihadron fragmentation functions is briefly outlined, that describes the fragmentation of a quark in two unpolarized hadrons. The parameters are tuned to the output of the PYTHIA event generator for two-hadron semi-inclusive production in deep inelastic scattering at HERMES. Then predictions are made for the unknown polarized fragmentation function and the related single-spin asymme...
متن کاملHadronization in Polarized Semi-Inclusive DIS: the Question of Independent Fragmentation
The new formalism for description of (un)polarized semi-inclusive DIS at moderate energies is developed. Hadron production is modeled as a product of distribution functions and hadronization functions (HFs) weighted by the hard scattering cross sections, as it is done in the LEPTO event generator. The correct treatment of polarization effects shows that description of semi-inclusive DIS within ...
متن کاملar X iv : h ep - p h / 04 12 15 0 v 1 11 D ec 2 00 4 A Model Independent Approach to Semi - Inclusive Deep Inelastic Scattering
We present a method for extraction of detailed information on polarized quark densities from semi-inclusive deep inelastic scattering l +N → l + h +X, in both LO and NLO QCD without any assumptions about fragmentation functions and polarized sea densities. The only symmetries utilised are charge conjugation and isotopic spin invariance of strong interactions. 1. At present the possibility to ob...
متن کامل