The Collins fragmentation function: a simple model calculation

A. Bacchetta, R. Kundu, A. Metz, P.J.G. Mulders

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    The Collins function belongs to the class of the so-called time-reversal odd fragmentation functions. Being chiral-odd as well, it can serve as an important tool to observe the nucleon's transversity distribution in semi-inclusive DIS. Due to the possible presence of final state interactions, this function can be non-zero, though this has never been demonstrated in an explicit model calculation. We use a simple pseudoscalar coupling between pions and quarks to model the fragmentation process and we show that the inclusion of one-loop corrections generates a non-vanishing Collins function, therefore giving support to its existence from the theoretical point of view. © 2001 Published by Elsevier Science B.V.
    Original languageEnglish
    Pages (from-to)155-161
    JournalPhysics Letters B
    Publication statusPublished - 2001


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