Study of vector meson fragmentation using a broken SU(3) model

Details Study of vector meson fragmentation using a broken SU(3) model Study of vector meson fragmentation using a broken SU(3) model

2011-02-28

arxiv.org/abs/1102.5594v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages PRD-latex with 8 eps figures

Scientific paper

Inclusive hadro production in e+ e- annihilation processes is examined to study the fragmentation process. A broken SU(3) model is used to determine the quark and gluon fragmentation functions of octet vector mesons, \rho and K*, in a simple way with an SU(3) breaking parameter \lambda. These are expressed in terms of just two light quark fragmentation functions, V(x, Q2) and \gamma(x, Q2) and the gluon fragmentation function Dg(x, Q2). These functions are parameterized at the low input scale of Q0^2 = 2 GeV^2, evolved through LO DGLAP evolution including charm and bottom flavour at appropriate thresholds, and fitted by comparison with data at the Z-pole. The model is extended with the introduction of a few additional parameters to include a study of singlet--octet mixing and hence \omega and \phi fragmentation. The model gives good fits to the available data for x >= 0.01, where x is the scaled energy of the hadron.

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