# Search for flavor changing neutral currents in single top quark production using 2.3 fb$^-1$ of $p\bar{p}$ collisions

### Description

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{sup -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 avor changing neutral current gluon couplings of the top quark to up quarks (tgu) and charm quarks (tgc). The cross section limits at the ... continued below

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## What

### Description

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{sup -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 avor 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 {sigma}{sub tgu} &lt; 0.20 pb and {sigma}{sub tgc} &lt; 0.27 pb. These correspond to limits on the top quark decay branching fractions of B(t {yields} gu) &lt; 2.0 x 10{sup -4} and B(t {yields} gc) &lt; 3.9 x 10{sup -3}.

### Identifier

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• Report No.: FERMILAB-PUB-10-203-E
• Grant Number: AC02-07CH11359
• Office of Scientific & Technical Information Report Number: 984007

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## When

• June 1, 2010

### Added to The UNT Digital Library

• Oct. 14, 2017, 8:36 a.m.

### Description Last Updated

• Oct. 24, 2017, 2:40 p.m.

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Abazov, Victor Mukhamedovich; /Dubna, JINR; Abbott, Braden Keim; U., /Oklahoma; Abolins, Maris A.; U., /Michigan State et al. Search for flavor changing neutral currents in single top quark production using 2.3 fb$^-1$ of $p\bar{p}$ collisions, article, June 1, 2010; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1013036/: accessed August 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.