The Beam Thrust Cross Section for Drell-Yan at NNLL Order
Abstract
At the LHC and Tevatron strong initial-state radiation (ISR) plays an important role. It can significantly affect the partonic luminosity available to the hard interaction or contaminate a signal with additional jets and soft radiation. An ideal process to study ISR is isolated Drell-Yan production, pp -> X l+l- without central jets, where the jet veto is provided by the hadronic event shape beam thrust tau_B. Most hadron collider event shapes are designed to study central jets. In contrast, requiring tau_B << 1 provides an inclusive veto of central jets and measures the spectrum of ISR. For tau_B << 1 we carry out a resummation of alpha_s^n ln^m tau_B corrections at next-to-next-to-leading-logarithmic order. This is the first resummation at this order for a hadron-hadron collider event shape. Measurements of tau_B at the Tevatron and LHC can provide crucial tests of our understanding of ISR and of tau_B's utility as a central jet veto.
Cite
@article{arxiv.1005.4060,
title = {The Beam Thrust Cross Section for Drell-Yan at NNLL Order},
author = {Iain W. Stewart and Frank J. Tackmann and Wouter J. Waalewijn},
journal= {arXiv preprint arXiv:1005.4060},
year = {2011}
}
Comments
4 pages, 5 figures, v2: journal version