# ICHEP2012

Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

## Measurement of the charge asymmetry in top quark pair production in pp collisions (CMS)

Jul 6, 2012, 9:15 AM
15m
Room 216 (Melbourne Convention and Exhibition Centre)

### Room 216

#### Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 4 - Top Quark Physics

### Speaker

Dr Thorsten Chwalek (KIT - Karlsruhe Institute of Technology (DE))

### Description

A measurement is presented of the charge asymmetry in top-pair production in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. The data are collected by the CMS experiment during the year 2011. The analysis uses events with one charged lepton and at least four jets. In order to measure the charge asymmetry in charge-symmetric initial state processes, the difference of absolute pseudo-rapidities of top and anti-top is used. The asymmetry is measured inclusively and differentially, as functions of the invariant mass, the rapidity and the transverse momentum of the ttbar system. The results are compared with various theory predictions, and discussed in the context of forward-backard asymmetry measurements at Tevatron.

### Primary author

Dr Thorsten Chwalek (KIT - Karlsruhe Institute of Technology (DE))

 Slides