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Registro de acceso abierto Limits on Anomalous Trilinear Gauge Couplings in Zγ Events from pp̅ Collisions at √s=1.96  TeV

Autor :Aaltonen, T.
Álvarez González, B.
Casal, Bruno
Cuevas, Javier
Gómez, G.
Palencia, Enrique
Rodrigo, Teresa
Ruiz Jimeno, Alberto
Scodellaro, Luca
Vila, Iván
Vilar, Rocío
Vizán, J.
Fecha de publicación :jul-2011
Editor:American Physical Society
Citación :Physical Review Letters 107(5): 051802 (2011)
Resumen:Using Zγ candidate events collected by the CDF detector at the Tevatron Collider, we search for potential anomalous (non-standard-model) couplings between the Z boson and the photon. Zγ couplings vanish at tree level and are heavily suppressed at higher orders; hence any evidence of couplings indicates new physics. Measurements are performed using data corresponding to an integrated luminosity of 4.9  fb-1 in the Z→νν̅ decay channel and 5.1  fb-1 in the Z→l+l- (l=μ, e) decay channels. The combination of these measurements provides the most stringent limits to date on Zγ trilinear gauge couplings. Using an energy scale of Λ=1.5  TeV to allow for a direct comparison with previous measurements, we find limits on the CP-conserving parameters that describe Zγ couplings to be |h3γ,Z|<0.022 and |h4γ,Z|<0.0009. These results are consistent with standard model predictions.
Descripción :8 páginas, 1 figura, 2 tablas.-- PACS numbers: 12.15.Ji, 12.60.-i, 13.85.Qk, 14.70.Hp.-- CDF Collaboration: et al.
Versión del editor:http://dx.doi.org/10.1103/PhysRevLett.107.051802
URI :http://hdl.handle.net/10261/46180
ISSN:0031-9007
E-ISSN:1079-7114
DOI:10.1103/PhysRevLett.107.051802
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