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W gamma Production and Limits on Anomalous WW gamma Couplings in p(p)over-bar Collisions at root s=1.96 TeV

Abstract : We measure the cross section and the difference in rapidities between photons and charged leptons for inclusive W -> lnu+gamma production in egamma and mugamma final states. Using data corresponding to an integrated luminosity of 4.2 fb-1 collected with the D0 detector at the Fermilab Tevatron Collider, the cross section multiplied by the branching fraction for the process ppbar -> Wgamma+X -> lnugamma+X, measured to be 15.8 +/- 0.8 (stat.) +/- 1.2 (syst.) pb, and the distribution of the charge-signed photon-lepton rapidity difference are found to be in agreement with the standard model. These results provide the most stringent limits on anomalous WWgamma couplings for data from hadron colliders: -0.4 < Delta kappa_gamma < 0.4 and -0.08 < lambda_gamma < 0.07 at the 95% C.L.
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http://hal.in2p3.fr/in2p3-00625963
Contributor : Sylvie Flores <>
Submitted on : Friday, September 23, 2011 - 9:39:43 AM
Last modification on : Wednesday, September 16, 2020 - 4:19:59 PM

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V. M. Abazov, F. Badaud, U. Bassler, G. Bernardi, M. Besançon, et al.. W gamma Production and Limits on Anomalous WW gamma Couplings in p(p)over-bar Collisions at root s=1.96 TeV. Physical Review Letters, American Physical Society, 2011, 107, pp.241803. ⟨10.1103/PhysRevLett.107.241803⟩. ⟨in2p3-00625963⟩

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