https://hal-cea.archives-ouvertes.fr/cea-01068781Hatta, Y.Y.HattaMarquet, CatherineCatherineMarquetRoyon, C.C.RoyonSoyez, GregoryGregorySoyezSPhT - Service de Physique Théorique - CEA - Commissariat à l'énergie atomique et aux énergies alternatives - CNRS - Centre National de la Recherche ScientifiqueUeda, T.T.UedaWerder, D.D.WerderA QCD description of the ATLAS jet veto measurementHAL CCSD2013[PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph]De Laborderie, Emmanuelle2014-09-26 12:51:472023-03-24 14:52:592014-09-26 12:51:47enPreprints, Working Papers, ...1We 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.