Title
Measurement of the cross section ratio <tex>$\sigma_{t\bar{t}b\bar{b}}/\sigma_{t\bar{t}jj}$</tex> in pp collisions <tex>$\sqrt{s}=$</tex>8 TeVMeasurement of the cross section ratio <tex>$\sigma_{t\bar{t}b\bar{b}}/\sigma_{t\bar{t}jj}$</tex> in pp collisions <tex>$\sqrt{s}=$</tex>8 TeV
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Elementary Particle Physics
Department of Physics
Publication type
article
Publication
Amsterdam,
Subject
Physics
Source (journal)
Physics letters: B. - Amsterdam, 1967, currens
Volume/pages
746(2015), p. 132-153
ISSN
0370-2693
ISI
000355378200022
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The first measurement of the cross section ratio sigma(t (t) over barb (b) over bar)/sigma(t (t) over bar jj) is presented using a data sample corresponding to an integrated luminosity of 19.6 fb(-1) collected in pp collisions at root s = 8 TeV with the CMS detector at the LHC. Events with two leptons (e or mu) and four reconstructed jets, including two identified as b quark jets, in the final state are selected. The ratio is determined for a minimum jet transverse momentum p(T) of both 20 and 40 GeV/c. The measured ratio is 0.022 +/- 0.003 (stat) +/- 0.005 (syst) for p(T) > 20GeV/c. The absolute cross sections sigma(t (t) over barb (b) over bar) and sigma(t (t) over bar jj) are also measured. The measured ratio for p(T) > 40 GeV/c is compatible with a theoretical quantum chromodynamics calculation at next-to-leading order. (C) 2015 CERN for the benefit of the CMS Collaboration. Published by Elsevier B.V.
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Full text (open access)
https://repository.uantwerpen.be/docman/irua/134812/126428.pdf
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