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Título : Search for Top-Quark Production via Flavor-Changing Neutral Currents in W+1 Jet Events at CDF
Autor : CDF Collaboration, Cabrera, Susana, Cuenca Almenar, Cristóbal, Álvarez González, B., Casal, Bruno, Cuevas, Javier, Gómez, G., Rodrigo, Teresa, Ruiz, Alberto, Scodellaro, Luca, Vila, Iván, Vilar, Rocío, Aaltonen, T.
Fecha de publicación : 17-Apr-2009
Editor: American Physical Society
Citación : Physical Review Letters 102 (15): 151801 (2009)
Resumen: We report on a search for the non-standard-model process u(c)+g -> t using pp collision data collected by the Collider Detector at Fermilab II detector corresponding to 2.2 fb(-1). The candidate events are classified as signal-like or backgroundlike by an artificial neural network. The observed discriminant distribution yields no evidence for flavor-changing neutral current top-quark production, resulting in an upper limit on the production cross section sigma(u(c)+g -> t)< 1.8 pb at the 95% C.L. Using theoretical predictions we convert the cross section limit to upper limits on flavor-changing neutral current branching ratios: B(t -> u+g)< 3.9x10(-4) and B(t -> c+g)< 5.7x10(-3).
Versión del editor: 10.1103/PhysRevLett.102.151801
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.102.151801
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