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Phys. Rev. Lett. 102, 151801 (2009) [7 pages]

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

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T. Aaltonen et al. CDF Collaboration
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Received 14 January 2009; published 16 April 2009

We report on a search for the non-standard-model process u(c)+gt using pp̅ 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 σ(u(c)+gt)<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(tu+g)<3.9×10-4 and B(tc+g)<5.7×10-3.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.151801
DOI:
10.1103/PhysRevLett.102.151801
PACS:
13.85.Rm, 12.15.Mm, 14.65.Ha