Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at √s = 8 TeV

V. Khachatryan; Petar Adžić; M. Ekmedzic; Jovan Milošević; V. Rekovic; Miloš Đorđević; Predrag Milenović; CMS Collaboration; Yasar Onel

doi:10.1140/epjc/s10052-014-3060-7

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Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at √s = 8 TeV

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Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at √s = 8 TeV

V. Khachatryan, Petar Adžić, M. Ekmedzic, Jovan Milošević, V. Rekovic, Miloš Đorđević, Predrag Milenović, CMS Collaboration and Yasar Onel

The European physical journal. C, Particles and fields, Vol.74(9), 3060

09/17/2014

DOI: 10.1140/epjc/s10052-014-3060-7

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Abstract

A measurement of the cross section for the production of top quark-antiquark pairs (t (t) over bar) in association with a vector boson V (W or Z) in proton-proton collisions at root s = 8 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb(-1) recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and mu) channels: a same-sign dilepton analysis targeting t (t) over barW events, and trilepton and four-lepton analyses designed for t (t) over barZ events. In the same-sign dilepton channel, the t (t) over barW cross section is measured as sigma(t (t) over barW) = 170(-80)(+90) (stat) +/- 70 (syst) fb, corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the t (t) over barZ cross section, sigma(t (t) over barZ) = 200(-70)(+80) (stat)(-30)(+40) (syst)fb(-1), is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive t (t) over barV process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.

High Energy Physics

Particle Physics

Physics

Astronomy (miscellaneous)

Engineering (miscellaneous)

Experiment

Z bosons

Details

Title: Subtitle: Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at √s = 8 TeV
Creators: V. Khachatryan - A. Alikhanyan National Laboratory
Petar Adžić
M. Ekmedzic
Jovan Milošević
V. Rekovic
Miloš Đorđević
Predrag Milenović
CMS Collaboration
Yasar Onel (Contributor) - Physics and Astronomy
Resource Type: Journal article
Publication Details: The European physical journal. C, Particles and fields, Vol.74(9), 3060
DOI: 10.1140/epjc/s10052-014-3060-7
ISSN: 1434-6044
eISSN: 1434-6052
Publisher: Springer
Language: English
Date published: 09/17/2014
Academic Unit: Physics and Astronomy
Record Identifier: 9984428671902771

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