Demonstration of the Equivalence of Soft and Zero-Bin Subtractions

Details Demonstration of the Equivalence of Soft and Zero-Bin Subtractions Demonstration of the Equivalence of Soft and Zero-Bin Subtractions

2007-07-09

arxiv.org/abs/0707.1101v1

Phys.Rev.D76:094015,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 3 figures

Scientific paper

10.1103/PhysRevD.76.094015

Calculations of collinear correlation functions in perturbative QCD and Soft-Collinear Effective Theory (SCET) require a prescription for subtracting soft or zero-bin contributions in order to avoid double counting the contributions from soft modes. At leading order in $\lambda$, where $\lambda$ is the SCET expansion parameter, the zero-bin subtractions have been argued to be equivalent to convolution with soft Wilson lines. We give a proof of the factorization of naive collinear Wilson lines that is crucial for the derivation of the equivalence. We then check the equivalence by computing the non-Abelian two-loop mixed collinear-soft contribution to the jet function in the quark form factor. These results provide strong support for the equivalence, which can be used to give a nonperturbative definition of the zero-bin subtraction at lowest order in $\lambda$.

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