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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/69892
Title: 
Z gamma production and limits on anomalous ZZ gamma and Z gamma gamma couplings in pp collisions at root s=1.96 TeV
Author(s): 
Institution: 
  • Universidad de Buenos Aires
  • Centro Brasileiro de Pesquisas Físicas (CBPF)
  • 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
  • IN2P3-CNRS et Université Paris-Sud
  • Universités Paris VI
  • CEA
  • Université de Haute Alsace
  • CNRS/IN2P3, Villeurbanne
  • RWTH Aachen University
  • 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
  • NIKHEF
  • Joint Institute for Nuclear Research
  • Institute for Theoretical and Experimental Physics (ITEP)
  • Moscow State University
  • Institute for High Energy Physics
  • Petersburg Nuclear Physics Institute
  • Uppsala University
  • Physik Institut der Universität Zürich
  • Lancaster University
  • Imperial College
  • University of Manchester
  • University of Arizona
  • University of California
  • California State University
  • Florida State University
  • Fermi National Accelerator Laboratory
  • University of Illinois at Chicago
  • Northern Illinois University
  • Northwestern University (NU)
  • Indiana University
  • University of Notre Dame
  • Purdue University Calumet
  • Iowa State University
  • University of Kansas (KU)
  • Kansas State University
  • Louisiana Tech University
  • University of Maryland
  • Boston University
  • Northeastern University
  • University of Michigan
  • Michigan State University
  • University of Mississippi
  • University of Nebraska
  • Princeton University
  • State University of New York
  • Columbia University
  • University of Rochester
  • Brookhaven National Laboratory
  • Langston University
  • University of Oklahoma
  • Oklahoma State University
  • Brown University
  • University of Texas
  • Southern Methodist University
  • Rice University
  • University of Virginia (UVA)
  • University of Washington
ISSN: 
0370-2693
Abstract: 
We present a study of eeγ and μμγ events using 1109 (1009) pb-1 of data in the electron (muon) channel, respectively. These data were collected with the DØ detector at the Fermilab Tevatron p over(p, ̄) collider at sqrt(s) = 1.96   TeV. Having observed 453 (515) candidates in the eeγ (μμγ) final state, we measure the Zγ production cross section for a photon with transverse energy ET > 7   GeV, separation between the photon and leptons Δ Rℓ γ > 0.7, and invariant mass of the di-lepton pair Mℓ ℓ > 30   GeV / c2, to be 4.96 ± 0.30 (stat . + syst .) ± 0.30 (lumi .)   pb, in agreement with the Standard Model prediction of 4.74 ± 0.22   pb. This is the most precise Zγ cross section measurement at a hadron collider. We set limits on anomalous trilinear Zγγ and ZZγ gauge boson couplings of - 0.085 < h30 γ < 0.084, - 0.0053 < h40 γ < 0.0054 and - 0.083 < h30 Z < 0.082, - 0.0053 < h40 Z < 0.0054 at the 95% C.L. for the form-factor scale Λ = 1.2   TeV.
Issue Date: 
27-Sep-2007
Citation: 
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 653, n. 5-6, p. 378-386, 2007.
Time Duration: 
378-386
Source: 
http://dx.doi.org/10.1016/j.physletb.2007.08.035
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/69892
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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