Momentum sum rules for fragmentation functions
classification
✦ hep-ph
hep-ex
keywords
fragmentationfunctionsmomentumrulesafer-teryaevanalysisarguecalculations
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Momentum sum rules for fragmentation functions are considered. In particular, we give a general proof of the Sch\"afer-Teryaev sum rule for the transverse momentum dependent Collins function. We also argue that corresponding sum rules for related fragmentation functions do not exist. Our model-independent analysis is supplemented by calculations in a simple field-theoretical model.
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