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Open Access item Search for Top-Quark Production via Flavor-Changing Neutral Currents in W+1 Jet Events at CDF

Authors: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.
Issue Date:17-Apr-2009
Publisher:American Physical Society
Citation:Physical Review Letters 102 (15): 151801 (2009)
Abstract: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).
Publisher version (URL):http://dx.doi.org/ 10.1103/PhysRevLett.102.151801
URI:http://hdl.handle.net/10261/22331
ISSN:0031-9007
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Appears in Collections:(IFIC) Artículos

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