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Power Corrections to Event Shapes with Mass-Dependent Operators

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arxiv 1209.3781 v2 pith:VK2UDGA3 submitted 2012-09-17 hep-ph

Vicent Mateu , Iain W. Stewart , Jesse Thaler This is my paper · ORCID
classification hep-ph
keywords powercorrectionseventoperatorshapesanomalousclassescorrection
verification ladder T0 review T1 audit T2 compute T3 formal
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We introduce an operator depending on the "transverse velocity" r that describes the effect of hadron masses on the leading 1/Q power correction to event-shape observables. Here, Q is the scale of the hard collision. This work builds on earlier studies of mass effects by Salam and Wicke and of operators by Lee and Sterman. Despite the fact that different event shapes have different hadron mass dependence, we provide a simple method to identify universality classes of event shapes whose power corrections depend on a common nonperturbative parameter. We also develop an operator basis to show that at a fixed value of Q, the power corrections for many classic observables can be determined by two independent nonperturbative matrix elements at the 10% level. We compute the anomalous dimension of the transverse velocity operator, which is multiplicative in r and causes the power correction to exhibit non-trivial dependence on Q. The existence of universality classes and the relevance of anomalous dimensions are reproduced by the hadronization models in Pythia 8 and Herwig++, though the two programs differ in the values of their low-energy matrix elements.

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Cited by 6 Pith papers

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