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A QCD description of the ATLAS jet veto measurement
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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.
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Super-Leading Logarithms in $pp\to2$ Jets
Super-leading logarithms contribute about 13 percent to the LHC pp to 2 jets gap-between-jets cross section at Q0 = 10 GeV, and a q qbar interference term is only 1/Nc suppressed.
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