Measurement of W gamma and Z gamma production in pp collisions at root s=7 TeV

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/53004

Title:	Measurement of W gamma and Z gamma production in pp collisions at root s=7 TeV
Authors:	Chatrchyan,S;Khachatryan,V;Sirunyan,AM;Tumasyan,A;Adam,W;Bergauer,T;Dragicevic,M;Ero,J;Fabjan,C;Friedl,M;Fruhwirth,R;...etc.
Contributors:	物理學系
Keywords:	GAUGE-BOSON COUPLINGS;HADRON COLLIDERS;AMPLITUDES;ZEROS;E(+)E(-);SECTOR;LIMITS;LEP
Date:	2011
Issue Date:	2012-06-11 10:53:36 (UTC+8)
Publisher:	國立中央大學
Abstract:	A measurement of W gamma and Z gamma production in proton-proton collisions at root s = 7 TeV is presented. Results are based on a data sample recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36 pb(-1). The electron and muon decay channels of the W and Z are used. The total cross sections are measured for photon transverse energy E(T)(gamma) > 10 GeV and spatial separation from charged leptons in the plane of pseudorapidity and azimuthal angle Delta R(l.gamma) > 0.7, and with an additional dilepton invariant mass requirement of M(ll) > 50 GeV for the Z gamma process. The following cross section times branching fraction values are found: sigma(pp -> W gamma + X) x B(W -> lv) = 56.3 +/- 5.0(stat.) +/- 5.0(syst.) +/- 2.3(lumi.) pb and sigma(pp -> Z gamma + X) x B(Z -> ll) = 9.4 +/- 1.0(stat.) +/- 0.6(syst.) +/- 0.4(lumi.) pb. These measurements are in agreement with standard model predictions. The first limits on anomalous WW gamma, ZZ gamma, and Z gamma gamma trilinear gauge couplings at root s = 7 TeV are set. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.
Relation:	PHYSICS LETTERS B
Appears in Collections:	[Department of Physics] journal & Dissertation

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