Abstract
This article summarizes recent Tevatron and LHC measurements of W/Z production in association with inclusive jets. The di erential cross sections are measured as a function of jet multiplicity and various kine- matic variables of jets or W=Z boson. Third-jet emission probability, angular correlations among reconstructed objects, and an event shape variable are studied. A first measurement of electroweak production cross section of the Z boson with two forward-backward jets is also presented. All results are compared to next-to-leading order perturbative QCD calculations and predictions of simulations that interface matrix-element calculations with parton showers. These studies constrain the backgrounds to searches for physics beyond the standard model.
Highlights
The studies of W/Z production in association with inclusive jets (V + jets) in hadron colliders provide a test of perturbative quantum chromodynamics
The next-to-leading order (NLO) perturbative quantum chromodynamics (pQCD) calculations and predictions of hybrid MCs agree with data for most of the kinematic distributions
Discrepancy is seen in the tails of the distributions, such as the highHT region, which encourages the development of next-to-next-toleading order (NNLO) pQCD predictions or simulations that interface NLO ME calculations to parton showers
Summary
The studies of W/Z production in association with inclusive jets (V + jets) in hadron colliders provide a test of perturbative quantum chromodynamics (pQCD). The V + jets production constitutes an important background to searches for rare standard model (SM) processes, such as single top and the SM Higgs boson, and to searches for particles predicted by new physics In these searches, the kinematic distributions of V + jets backgrounds are usually estimated with hybrid MCs, i.e. the simulations that include leading order (LO) or next-to-leading order (NLO) multiparton matrix-element (ME) calculations, supplemented by parton showers. The measured ∆φ(Z, j1) between Z and the leading jet in Z+ ≥ 1 jet events has a good agreement with powheg and alpgen, but large discrepancy from nnlo loopsim+mcfm and NLO mcfm in the region of ∆φ(Z, j1) < π/2. For the leading jet pT in Z/γ∗+ ≥ 1 jet events, the NLO electroweak correction in nlo qcd ⊗ nlo ew is -5% in the highest pT bin due to the large Sudakov logarithms which appears in the virtual part of the calculation; the correction is expected to be important at the LHC energy
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
