# EPS HEP 2013 Stockholm

17-24 July 2013
KTH and Stockholm University Campus
Europe/Stockholm timezone

## Measurement of W/Z boson + jet production differential cross sections

19 Jul 2013, 12:05
10m
E1 (KTH Campus)

### E1

#### KTH Campus

Talk presentation QCD

### Speaker

Bjoern Penning (University of Chicago (US))

### Description

Associated production of a W/Z bosons with jets are studied as a function of various kinematic observables. We present measurements of the ratios of cross sections, $\sigma(p\bar{p}\to Z+b~\text{jet})$/$\sigma(p\bar{p}\to Z+\text{jet})$, $\sigma(p\bar{p}\to Z+c~\text{jet})$/$\sigma(p\bar{p}\to Z+\text{jet})$ and $\sigma(p\bar{p}\to Z+c~\text{jet})$/$\sigma(p\bar{p}\to Z+b~\text{jet})$, performed by the DO Collaboration in Run II of the Tevatron \ppbar collisions at a center-of-mass energy of 1.96~TeV, corresponding to an integrated luminosity of 9.7~fb^{-1}. Results are compared to predictions from next-to-leading order calculations and various Monte Carlo event generators. We also present a comprehensive analysis of inclusive $W(\to e\nu)+n-jet (n\geq 1,2,3,4)$ production in proton-antiproton collisions. Differential cross sections are measured as a function of a variety of kinematic variables. In addition, the mean number of jets in an event containing a W boson is measured as a function of H_T, and as a function of the rapidity separations between the two highest-p_T jets and between the most widely separated jets in rapidity. Finally, the probability for third-jet emission in events containing a W boson and at least two jets is studied by measuring the fraction of events in the inclusive W+2-jet sample that contain a third jet over a p_T threshold. Regions of the phase space where there is agreement or disagreement with the data are discussed for the different theoretical models tested.

### Primary author

The DØ Collaboration (Fermi National Laboratory)

 Slides