We report on a search for the non-standard-model process u(c)+g -> t using p (p) over bar collisions 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).

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

CIOCCI, MARIA AGNESE;DONATI, SIMONE;
2009-01-01

Abstract

We report on a search for the non-standard-model process u(c)+g -> t using p (p) over bar collisions 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).
2009
T., Aaltonen; J., Adelman; T., Akimoto; B. A., Gonzalez; S., Amerio; D., Amidei; A., Anastassov; A., Annovi; J., Antos; G., Apollinari; A., Apresyan; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828947
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