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Título : 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
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
DOI: 10.1103/PhysRevLett.107.051802
Citación : Physical Review Letters 107(5): 051802 (2011)
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