# EPS HEP 2015

22-29 July 2015
Europe/Vienna timezone

## Tevatron combined single top production cross sections

Jul 23, 2015, 3:06 PM
18m
HS31

### HS31

talk Top and Electroweak Physics

### Speaker

Manfredi Ronzani (Albert-Ludwigs-Universitaet Freiburg (DE))

### Description

We present measurements of the cross sections for the two main production modes of single top quarks in ppbar collisions at a center-of-mass energy of 1.96 TeV in the Run II data collected with the CDF and D0 detector at the Fermilab Tevatron Collider. For this measurement the full data set corresponding to an integrated luminosity of up to 9.7 fb$^{-1}$ per experiment is used. We report the first observation of single top quark production in the s-channel with a significance of 6.3 standard deviations. We also present a simultaneous measurement of the production cross section of t- and s+t-channels. Using these measurements we set a lower limit on the CKM matrix element |Vtb| > 0.92 at 95% C.L., assuming mt = 172.5 GeV.

### Primary authors

Bob.Hirosky DZERO.PHYSICS.COORDINATOR (DZero Experiment, Fermilab) Boris.Tuchming DZERO.PHYSICS.COORDINATOR (DZero Experiment, Fermilab)