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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 collisions
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
2010 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 693, no 2, 81-87 p.Article in journal (Refereed) Published
Abstract [en]

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(tgu)<2.0×10−4 and B(tgc)<3.9×10−3.

Place, publisher, year, edition, pages
2010. Vol. 693, no 2, 81-87 p.
Keyword [en]
Top quark, Single top, FCNC, Flavor-changing neutral current, Quark–gluon coupling, Tevatron, Proton–antiproton collider
National Category
Subatomic Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-47312DOI: 10.1016/j.physletb.2010.08.011ISI: 000283020100003OAI: oai:DiVA.org:su-47312DiVA: diva2:373598
Projects
D0
Funder
Swedish Research Council
Note
Publikationen har totalt 445 författare, V. Abazov et al.Available from: 2010-12-01 Created: 2010-12-01 Last updated: 2017-12-12Bibliographically approved

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Åsman, Barbro
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