# IOP 2014 Joint HEPP & APP Group Meeting

Apr 7 – 9, 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

## A measurement of the $\phi^{\star}$ angle in Drell-Yan di-lepton pairs

Apr 8, 2014, 1:15 PM
15m
Room A (Windsor Building)

### Room A

#### Windsor Building

contributed talk The Energy Frontier Programme

### Speaker

Samuel Webb (University of Manchester (GB))

### Description

The $\phi_{\eta}^{\star}$ angle of Drell-Yan di-lepton pairs probes initial state gluon radiation and its definition relies only upon the well-measured lepton directions. The $\phi_{\eta}^{\star}$ distribution is sensitive to similar but complementary physics to the intermediate boson transverse momentum distribution. A measurement of the normalised $\phi_{\eta}^{\star}$ differential cross section around the Z-pole was made using the ATLAS detector at 7 TeV. In this talk progress towards an updated measurement using the full 8 TeV dataset is presented.

### Primary author

Samuel Webb (University of Manchester (GB))

 Slides