Thursday, January 10, 2013

1301.1910 (Y. Hatta et al.)

A QCD description of the ATLAS jet veto measurement    [PDF]

Y. Hatta, C. Marquet, C. Royon, G. Soyez, T. Ueda, D. Werder
We present a new QCD description of the ATLAS jet veto measurement, using the Banfi-Marchesini-Smye equation to constrain the inter-jet QCD radiation. This equation resums emissions of soft gluons at large angles, at leading-logarithmic accuracy, and accounts for both the so-called Sudakov and non-global logarithms. We show that this approach is able to reproduce, with no fitting parameters, the fraction of high-pT forward/backward di-jet events which do not contain additional hard emissions in the inter-jet rapidity range. We also compute the gap fraction in fixed-order perturbation theory to O(alpha_s^2) and show that the perturbative series is unstable at large rapidity intervals.
View original: http://arxiv.org/abs/1301.1910

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