On the effectiveness of threshold resummation away from hadronic endpoint

Abstract

We parameterize the enhancement of threshold effects away from hadronic endpoint that arise due to the steeply falling nature of parton distribution functions, within the context of soft-collinear effective theory. This is accomplished in a process-independent way by directly linking the charac- teristic scale of soft and collinear radiation, \lambda, to the shape of the pdfs. This allows us quantify the power corrections to partonic threshold resummation as a function of the invariant mass and rapidity of the final state. In the context of SCET, being able to compute \lambda in a process-independent manner allows us to determine the correct scale for threshold resummation after integration with the pdfs, without any additional procedure.

Comments: Version 2, corrected several typos, and added a figure for clarification, 9 pages, 3 figures