Measurement of associated production of vector bosons and top quark-antiquark pairs at sqrt(s) = 7 TeV - INSPIRE

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Measurement of associated production of vector bosons and top quark-antiquark pairs at sqrt(s) = 7 TeV

CMS

Collaboration

Mar 13, 2013

27 pages

Published in:

Phys.Rev.Lett. 110 (2013) 172002

Published: Apr 25, 2013

e-Print:

1303.3239 [hep-ex]

DOI:

10.1103/PhysRevLett.110.172002

Report number:

CMS-TOP-12-014,
CERN-PH-EP-2013-033

Experiments:

CERN-LHC-CMS

View in:

reference search101 citations

Citations per year

Abstract: (arXiv)

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 data set corresponding to an integrated luminosity of 5.0 inverse femtobarms, 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 next-to-leading order predictions of 0.137 +0.012/-0.016 and 0.306 +0.031/-0.053 pb.

Note:

Replaced with published version. Added journal reference and DOI

p p: interaction
top: pair production
vector boson: associated production
p p: scattering
dilepton: same sign
CERN LHC Coll
background
4/3
CMS
W: leptonic decay

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