Search for Flavor Changing Neutral Currents via Quark-Gluon Couplings in Single Top Quark Production using 2.3 fb$^{-1}$ of $p\bar{p}$ Collisions

Tanasijczuk, Andres Jorge;D0;et.al.
(2010) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 693, p. 81 (2010)

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Abstract
We present a search for flavor changing neutral currents via quark–gluon couplings in a sample of single top quark final states corresponding to 2.3 fb −1 of integrated luminosity collected with the D0 detector at the Fermilab Tevatron Collider. We select events containing a single top quark candidates with an additional jet, and obtain separation between signal and background using Bayesian neural networks. We find consistency between background expectation and observed data, and set limits on flavor changing neutral current gluon couplings of the top quark to up quarks ( tgu ) and charm quarks ( tgc ). The cross section limits at the 95% C.L. are σtgu<0.20 pb and σtgc<0.27 pb . These correspond to limits on the top quark decay branching fractions of B(t→gu)<2.0×10−4 and B(t→gc)<3.9×10−3 .
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Tanasijczuk, A. J., D0, & et al. (2010). Search for Flavor Changing Neutral Currents via Quark-Gluon Couplings in Single Top Quark Production using 2.3 fb$^{-1}$ of $p\bar{p}$ Collisions. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 693, 81. https://doi.org/10.1016/j.physletb.2010.08.011 (Original work published 2010)