Abstract
We describe a Monte Carlo code for the fragmentation of polarized quarks into pseudoscalar mesons. The quark jet is generated by iteration of the splitting q → h + q′ where q and q′ indicate quarks and h a hadron. The splitting function describing the energy sharing between q′ and h is calculated on the basis of the Symmetric Lund Model where the quark spin is introduced through spin matrices as foreseen in the 3P0 mechanism. A complex mass parameter is introduced for the parametrisation of the Collins effect. The results for the Collins analysing power and the comparison with the Collins asymmetries measured by the COMPASS collaboration are presented. For the first time preliminary results on the simulated azimuthal asymmetry due to the Boer-Mulders function are also given.
Highlights
Sarting from the recent work of Ref. [1, 2] we have developed a model for the fragmentation of polarized quarks into pseudoscalar mesons and implemented it in a stand alone Monte Carlo program
The Monte Carlo prediction is rescaled by a factor ' 0.05 calculated from the comparison with the Collins asymmetry as function of pT for ⇡ measured in COMPASS
We have implemented in a stand alone Monte Carlo program a model for the fragmentation of polarized quarks using the Symmetric Lund Model and the 3P0 mechanism
Summary
The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. - Effects of Quark Spin Flip on the Collins Fragmentation Function in a Toy Model H H Matevosyan, A W Thomas and W Bentz. This content was downloaded from IP address 134.158.139.192 on 20/11/2018 at 14:57. Universite Lyon 1, CNRS/IN2P3, Institut de Physique Nucleaire de Lyon, 69622 Villeurbanne, France. Laboratoire de Physique Theorique, Faculte des Sciences Exactes et de l’Informatique, Universite Mohammed Seddik Ben Yahia, B.P. 98 Ouled Aissa, 18000 Jijel, Algeria
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