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)
