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

T. Aaltonen et al. (CDF Collaboration)
Phys. Rev. Lett. 102, 151801 – Published 16 April 2009

Abstract

We report on a search for the non-standard-model process u(c)+gt using pp¯ collision data collected by the Collider Detector at Fermilab II detector corresponding to 2.2fb1. 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 σ(u(c)+gt)<1.8pb 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(tu+g)<3.9×104 and B(tc+g)<5.7×103.

  • Figure
  • Received 14 January 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.151801

©2009 American Physical Society

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Vol. 102, Iss. 15 — 17 April 2009

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