Artículos de revistas
Measurement of the pp̄→WZ+X cross section at s=1.96TeV and limits on WWZ trilinear gauge couplings
Fecha
2007-12-28Registro en:
Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 76, n. 11, 2007.
1550-2368
1550-7998
10.1103/PhysRevD.76.111104
2-s2.0-37649000954
Autor
Universidad de Buenos Aires
Centro Brasileiro de Pesquisas Físicas
Universidade do Estado do Rio de Janeiro (UERJ)
Universidade Estadual Paulista (UNESP)
University of Alberta
University of Science and Technology of China
Universidad de Los Andes
Charles University
Czech Technical University
Academy of Sciences of the Czech Republic
Universidad San Francisco de Quito
Université Blaise Pascal
Universite de Grenoble 1
Université de la Méditerranée
Université Paris-Sud
Universités Paris VI and VII
CEA
IN2P3
CNRS/IN2P3
RWTH Aachen
Universität Bonn
Universität Freiburg
Universität Mainz
Ludwig-Maximilians-Universität München
University of Wuppertal
Panjab University
Delhi University
Tata Institute of Fundamental Research
University College Dublin
Korea University
SungKyunKwan University
CINVESTAV
University of Amsterdam/NIKHEF
Radboud University Nijmegen/NIKHEF
Joint Institute for Nuclear Research
Institute for Theoretical and Experimental Physics
Moscow State University
Institute for High Energy Physics
Petersburg Nuclear Physics Institute
Lund University
Universität Zürich
Lancaster University
Imperial College
University of Manchester
University of Arizona
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Fermi National Accelerator Laboratory
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Georg-August-University Göttingen
Helsinki Institute of Physics
Simon Fraser University
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Université de Lyon
Stockholm University
Uppsala University
Institución
Resumen
We present measurements of the process pp̄→WZ+X→ℓ′ νℓ′ℓ̄ at s=1.96TeV, where ℓ and ℓ′ are electrons or muons. Using 1fb-1 of data from the D0 experiment, we observe 13 candidates with an expected background of 4.5±0.6 events and measure a cross section σ(WZ)=2.7-1.3+1.7pb. From the number of observed events and the Z boson transverse momentum distribution, we limit the trilinear WWZ gauge couplings to -0.17≤λZ≤0.21(ΔκZ=0) at the 95% C.L. for a form factor scale Λ=2TeV. Further, assuming that Δg1Z= ΔκZ, we find -0.12≤ΔκZ≤0.29(λZ=0) at the 95% C.L. These are the most restrictive limits on the WWZ couplings available to date. © 2007 The American Physical Society.