Measurement of the tt¯ production cross-section as a function of jet multiplicity and jet transverse momentum in 7 TeV proton-proton collisions with the ATLAS detector

Aad, G. et al. (2015) Measurement of the tt¯ production cross-section as a function of jet multiplicity and jet transverse momentum in 7 TeV proton-proton collisions with the ATLAS detector. Journal of High Energy Physics, 2015, 20. (doi: 10.1007/JHEP01(2015)020)

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The tt¯ production cross-section dependence on jet multiplicity and jet transverse momentum is reported for proton-proton collisions at a centre-of-mass energy of 7 TeV in the single-lepton channel. The data were collected with the ATLAS detector at the CERN Large Hadron Collider and comprise the full 2011 data sample corresponding to an integrated luminosity of 4.6 fb−1. Differential cross-sections are presented as a function of the jet multiplicity for up to eight jets using jet transverse momentum thresholds of 25, 40, 60, and 80 GeV, and as a function of jet transverse momentum up to the fifth jet. The results are shown after background subtraction and corrections for all known detector effects, within a kinematic range closely matched to the experimental acceptance. Several QCD-based Monte Carlo models are compared with the results. Sensitivity to the parton shower modelling is found at the higher jet multiplicities, at high transverse momentum of the leading jet and in the transverse momentum spectrum of the fifth leading jet. The MC@NLO+HERWIG MC is found to predict too few events at higher jet multiplicities.

Item Type:Articles
Additional Information:Authors: ATLAS Collaboration. Article funded by SCOAP3.
Glasgow Author(s) Enlighten ID:Qin, Dr Gang and Oropeza Barrera, Mrs Cristina and Robson, Professor Aidan and Ferrando, Dr James and Cinca, Dr Diane and Wright, Mr Michael and Doherty, Mr Thomas and Stewart, Dr Gordon and Doyle, Professor Anthony and St Denis, Dr Richard and Gul, Dr Umar and Bates, Dr Richard and Ferreira De Lima, Dr Danilo and Buckley, Dr Andy and Thompson, Dr Alan and O'Shea, Professor Val and Moraes, Mr Arthur and Buzatu, Dr Adrian and Saxon, Professor David and Kar, Dr Deepak and Bussey, Dr Peter and Buttar, Professor Craig and D'Auria, Dr Saverio and Smith, Professor Kenway and Britton, Professor David and Knue, Dr Andrea and Ferrag, Dr Samir
Authors: Aad, G., Abbott, G., Bates, R.L., Britton, D.I., Buckley, A.G., Bussey, P., Buttar, C.M., Buzatu, A., Cinca, D., D'Auria, S., Doherty, T., Doyle, A.T., Ferrag, S., Ferrando, J., Ferreira De Lima, D., Gemmell, A., Gul, U., Gutierrez Ortiz, N.G., Kar, D., Knue, A., Moraes, A., O'Shea, V., Oropeza Barrera, C., Qin, G., Quilty, D., Ravenscroft, T., Robson, A., Saxon, D.H., Smith, K.M., St Denis, R.D., Stewart, G.A., Thompson, A.S., and Wright, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of High Energy Physics
ISSN (Online):1029-8479
Published Online:08 January 2015
Copyright Holders:Copyright © 2015 CERN for the benefit of the ATLAS Collaboration
First Published:First published in Journal of High Energy Physics 2015:20
Publisher Policy:Reproduced under a Creative Commons License
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