# IOP 2014 Joint HEPP & APP Group Meeting

7-9 April 2014
Royal Holloway, University of London
Europe/London timezone
Institute of Physics 2014 Joint High Energy Particle Physics and Astro Particle Physics Groups Annual Meeting

## First Observation of the Associated Production of a Single Top Quark with a W Boson

8 Apr 2014, 15:15
15m
Room A (Windsor Building)

### Room A

#### Windsor Building

contributed talk The Energy Frontier Programme

### Speaker

Mr Duncan Leggat (University of Brunel)

### Description

The observation of the associated production of a single top quark and W boson using 12.2 fb$^{-1}$ of pp collisions at $\sqrt{s} = 8$ TeV with the CMS experiment is presented. A multivariate analysis based on kinematic variables was used to discriminate signal from the dominant ttbar background. The observed signal has a significance of 6.0$\sigma$ and a cross section of $23.9^{+5.7}_{-5.6}$ pb. A cut and count cross check analysis was also carried out, finding a signal with a significance of 3.6$\sigma$ and a cross section of $33.9^{+8.6}_{-8.6}$. The results are in agreement with the standard model expectation of $22.2\pm 0.6\pm 1.4$ pb.

### Primary author

Mr Duncan Leggat (University of Brunel)

 Slides