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Measurement of jet activity in top quark events using the eμ final state with two b -tagged jets in pp collisions at √s = 8 TeV with the ATLAS detector

CollaborationWith : Ancu, Lucian Stefan / Bilbao De Mendizabal, Javier / Calace, Noemi / Chatterjee, Avishek / Clark, Allan Geoffrey / Coccaro, Andrea / Delitzsch, Chris Malena / Della Volpe, Domenico / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / Khoo, Teng Jian / Lanfermann, Marie Christine / Lionti, Anthony Eric / March Ruiz, Luis / Mermod, Philippe / Miucci, Antonio / Nackenhorst, Olaf / Nessi, Marzio / Paolozzi, Lorenzo / Ristic, Branislav / Schramm, Steven / Sfyrla, Anna / Vallecorsa, Sofia / Wu, Xin
Published in Journal of High Energy Physics. 2016, vol. 1609, p. 074-136
Collection Open Access - SCOAP3
Abstract Measurements of the jet activity in t t ¯ events produced in proton-proton collisions at √s = 8 TeV are presented, using 20.3 fb −1 of data collected by the ATLAS experiment at the Large Hadron Collider. The events were selected in the dilepton eμ decay channel with two identified b -jets. The numbers of additional jets for various jet transverse momentum ( p T ) thresholds, and the normalised differential cross-sections as a function of p T for the five highest- p T additional jets, were measured in the jet pseudo-rapidity range | η | < 4 . 5. The gap fraction, the fraction of events which do not contain an additional jet in a central rapidity region, was measured for several rapidity intervals as a function of the minimum p T of a single jet or the scalar sum of p T of all additional jets. These fractions were also measured in different intervals of the invariant mass of the e μ b b ¯ system. All measurements were corrected for detector effects, and found to be mostly well-described by predictions from next-to-leading-order and leading-order t t ¯ event generators with appropriate parameter choices. The results can be used to further optimise the parameters used in such generators.
Keywords Hadron-Hadron scattering (experiments)
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arXiv: 1606.09490
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ATLAS COLLABORATION. Measurement of jet activity in top quark events using the eμ final state with two b -tagged jets in pp collisions at √s = 8 TeV with the ATLAS detector. In: Journal of High Energy Physics, 2016, vol. 1609, p. 074-136. doi: 10.1007/JHEP09(2016)074 https://archive-ouverte.unige.ch/unige:88169

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Deposited on : 2016-10-12

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