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Search for Production of Single Top Quarks Via tcg and tug Flavor-Changing-Neutral-Current Couplings
Baringer, Philip S. Bean, Alice Hensel, Carsten Moulik, Tania Wilson, Graham Wallace
Baringer, Philip S.
Bean, Alice
Hensel, Carsten
Moulik, Tania
Wilson, Graham Wallace
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Abstract
We search for the production of single top quarks via flavor-changing-neutral-current couplings of a gluon to the top quark and a charm (c) or up (u) quark. We analyze 230 pb(−1) of lepton+jets data from pp-bar collisions at a center of mass energy of 1.96 TeV collected by the D0 detector at the Fermilab Tevatron Collider. We observe no significant deviation from standard model predictions, and hence set upper limits on the anomalous coupling parameters κ(c)(g)/Λ and κ(u)(g)/Λ, where κg define the strength of tcg and tug couplings, and Λ defines the scale of new physics. The limits at 95% C.L. are κ(c)(g)/Λ<0.15 TeV(−1) and κug/Λ<0.037 TeV(−1).
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This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.99.191802.
Date
2007-11-06
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American Physical Society
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Baringer_11-6-2007.pdf
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V. M. Abazov et al. (D0 Collaboration). (2007). "Search for Production of Single Top Quarks Via tcg and tug Flavor-Changing-Neutral-Current Couplings." Physical Review Letters, 99(19):191802. http://dx.doi.org/10.1103/PhysRevLett.99.191802