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 - INSPIRE

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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

D0

Collaboration

Jun, 2010

8 pages

Published in:

Phys.Lett.B 693 (2010) 81-87

e-Print:

1006.3575 [hep-ex]

DOI:

10.1016/j.physletb.2010.08.011

PDG:

{\mathit {\mathit t}}

-quark FCNC Couplings

\kappa {}^{utg}/\Lambda

\kappa {}^{ctg}/\Lambda

Report number:

FERMILAB-PUB-10-203-E

Experiments:

FNAL-E-0823

View in:

reference search93 citations

Citations per year

Abstract: (Elsevier)

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 .

Note:

published by Phys. Lett. B

12.15.Ji
14.65.Ha
13.85.Qk
Top quark
Single top
FCNC
Flavor-changing neutral current
Quark-gluon coupling
Tevatron
Proton-antiproton collider

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