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arXiv · 1005.4060

The Beam Thrust Cross Section for Drell-Yan at NNLL Order

Iain W. Stewart·Frank J. Tackmann·Wouter J. Waalewijn
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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.

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Iain W. Stewart, Frank J. Tackmann, Wouter J. Waalewijn. 2011-01-15. The Beam Thrust Cross Section for Drell-Yan at NNLL Order. https://doi.org/10.1103/physrevlett.106.032001

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