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Journal Articles Physical Review Letters Year : 2013

Measurement of associated production of vector bosons and t t-bar at sqrt(s)= 7 TeV

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S. Chatrchyan
  • Function : Author
S. Baffioni
Pierre Busson
R. Granier de Cassagnac
C. Mironov
P. Paganini
C. Collard
P. van Hove
D. Contardo
M. Gouzevitch
M. Lethuillier
V. Sordini

Abstract

The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at sqrt(s) = 7 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 5.0 inverse femtobarns, recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of t t-bar Z events and a same-sign dilepton analysis of t t-bar V (V= W or Z) events. In the trilepton channel a direct measurement of the t t-bar Z cross section sigma(t t-bar Z) = 0.28 +0.14/-0.11 (stat) +0.06/-0.03 (syst) pb is obtained. In the dilepton channel a measurement of the t t-bar V cross section yields sigma(t t-bar V) = 0.43 +0.17/-0.15 (stat) +0.09/-0.07 (syst) pb. These measurements have a significance, respectively, of 3.3 and 3.0 standard deviations from the background hypotheses and are compatible, within uncertainties, with the corresponding NLO predictions of 0.137 +0.012/-0.016 and 0.306 +0.031/-0.053 pb.

Dates and versions

in2p3-00800561 , version 1 (14-03-2013)

Identifiers

Cite

S. Chatrchyan, M. Besançon, S. Choudhury, F. Couderc, M. Dejardin, et al.. Measurement of associated production of vector bosons and t t-bar at sqrt(s)= 7 TeV. Physical Review Letters, 2013, 110, pp.172002. ⟨10.1103/PhysRevLett.110.172002⟩. ⟨in2p3-00800561⟩
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