Collins fragmentation function for pions and kaons in a spectator model

Alessandro Bacchetta (DESY); Asmita Mukherjee (Indian Inst. Tech.; Gary R. Goldstein (Tufts U.); Leonard P. Gamberg (Penn State U.); Mumbai)

Collins fragmentation function for pions and kaons in a spectator model

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arxiv 0707.3372 v1 pith:QZ63EFOH submitted 2007-07-23 hep-ph

Collins fragmentation function for pions and kaons in a spectator model

Alessandro Bacchetta (DESY) , Leonard P. Gamberg (Penn State U.) , Gary R. Goldstein (Tufts U.) , Asmita Mukherjee (Indian Inst. Tech. , Mumbai) This is my paper

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keywords functioncollinsmodelfragmentationkaonspionsspectatoraddition

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We calculate the Collins fragmentation function in the framework of a spectator model with pseudoscalar pion-quark coupling and a Gaussian form factor at the vertex. We determine the model parameters by fitting the unpolarized fragmentation function for pions and kaons. We show that the Collins function for the pions in this model is in reasonable agreement with recent parametrizations obtained by fits of the available data. In addition, we compute for the first time the Collins function for the kaons.

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