Differential top-antitop cross-section measurements as a function of observables constructed from final-state particles using pp collisions at root s=7 TeV in the ATLAS detectorShow others and affiliations
Number of Authors: 28802015 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 6, article id UNSP 100Article in journal (Refereed) Published
Abstract [en]
Various differential cross-sections are measured in top-quark pair (t (t) over bar) events produced in proton-proton collisions at a centre-of-mass energy of root s = 7 TeV at the LHC with the ATLAS detector. These differential cross-sections are presented in a data set corresponding to an integrated luminosity of 4.6 fb(-1). The differential cross-sections are presented in terms of kinematic variables, such as momentum, rapidity and invariant mass, of a top-quark proxy referred to as the pseudo-top-quark as well as the pseudo-top-quark pair system. The dependence of the measurement on theoretical models is minimal. The measurements are performed on tt events in the lepton+jets channel, requiring exactly one charged lepton and at least four jets with at least two of them tagged as originating from a b-quark. The hadronic and leptonic pseudo-top-quarks are defined via the leptonic or hadronic decay mode of the W boson produced by the top-quark decay in events with a single charged lepton. Differential cross-section measurements of the pseudo-top-quark variables are compared with several Monte Carlo models that implement next-to-leading order or leading-order multi-leg matrix-element calculations.
Place, publisher, year, edition, pages
2015. Vol. 6, article id UNSP 100
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-258803DOI: 10.1007/JHEP06(2015)100ISI: 000356797600001OAI: oai:DiVA.org:uu-258803DiVA, id: diva2:842488
Note
ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP06(2015)100
2015-07-202015-07-202017-12-04Bibliographically approved