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

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http://hdl.handle.net/10138/24400

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Aaltonen , T , Mehtälä , P , Mäki , T , Orava , R , Saarikko , H , Österberg , K & CDF Collaboration 2009 , ' Search for Top-Quark Production via Flavor-Changing Neutral Currents in W+1 Jet Events at CDF ' , Physical Review Letters , vol. 102 , no. 15 , pp. 151801 . https://doi.org/10.1103/PhysRevLett.102.151801

Title: Search for Top-Quark Production via Flavor-Changing Neutral Currents in W+1 Jet Events at CDF
Alternative title: Search for top-quark production via flavor-changing neutral currents in W+1 jet events at CDF
Author: Aaltonen, T.; Mehtälä, Petteri; Mäki, Tuula; Orava, Risto; Saarikko, Heimo; Österberg, Kenneth; CDF Collaboration
Contributor organization: Helsinki Institute of Physics
Department of Physics
Date: 2009
Language: eng
Number of pages: 7
Belongs to series: Physical Review Letters
ISSN: 0031-9007
DOI: https://doi.org/10.1103/PhysRevLett.102.151801
URI: http://hdl.handle.net/10138/24400
Abstract: We report on the first search for top-quark production via flavor-changing neutral-current (FCNC) interactions in the non-standard-model process u(c)+g -> t using ppbar collision data collected by the CDF II detector. The data set corresponds to an integrated luminosity of 2.2/fb. The candidate events feature the signature of semileptonic top-quark decays and are classified as signal-like or background-like by an artificial neural network trained on simulated events. The observed discriminant distribution is in good agreement with the one predicted by the standard model and provides no evidence for FCNC top-quark production, resulting in a Bayesian upper limit on the production cross section sigma (u(c)+g -> t) u+g) c+g)We report on a search for the non-standard-model process u(c)+g→t 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)+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)<3.9×10-4 and B(t→c+g)<5.7×10-3.
Description: 15 pages, 2 figures
Subject: 114 Physical sciences
hep-ex
Peer reviewed: Yes
Usage restriction: restrictedAccess


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