Z gamma production and limits on anomalous ZZ gamma and Z gamma gamma couplings in pp collisions at root s=1.96 TeV
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
27/05/2014
27/05/2014
27/09/2007
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Resumo |
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. |
Formato |
378-386 |
Identificador |
http://dx.doi.org/10.1016/j.physletb.2007.08.035 Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 653, n. 5-6, p. 378-386, 2007. 0370-2693 http://hdl.handle.net/11449/69892 10.1016/j.physletb.2007.08.035 2-s2.0-34548587780 |
Idioma(s) |
eng |
Relação |
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
Direitos |
closedAccess |
Tipo |
info:eu-repo/semantics/article |