# DPF 2011

8-13 August 2011
Rhode Island Convention Center
US/Eastern timezone

## Search for flavor changing neutral currents in decays of top quarks

10 Aug 2011, 15:20
20m
553 (Rhode Island Convention Center)

### 553

#### Rhode Island Convention Center

Parallel contribution Top Quark Physics

### Speaker

Carrie McGivern (University of Kansas)

### Description

We present a search for flavor changing neutral currents in decays of top quarks. The analysis is based on a search for $t\bar{t}\rightarrow\ell'\nu\ell\bar{\ell}$+jets ($\ell, \ell' = e,\mu$) final states using 4.1~{\rm fb}$^{-1}$ of integrated luminosity of $p\bar{p}$ collisions at $\sqrt{s} = 1.96$~{\rm TeV}. We extract limits on the branching ratio $B(t\rightarrow Zq)$ ($q = u, c$ quarks), assuming anomalous $tuZ$ or $tcZ$ couplings. We do not observe any sign of such anomalous coupling and set a limit of $B < 3.2\%$ at 95\% C.L.

### Primary author

Carrie McGivern (University of Kansas)

### Presentation Materials

 DPF_2011_Talk_Final.key DPF_2011_Talk_Final.pdf DPF_2011_Talk_Final.ppt