Abstract
Measurements of single W, Z boson production in association with jets probe QCD in multi-scale environment. Measurements of W + jet and Z + jet production and their ratio, extending to high jet multiplicities, and a large set of kinematic distributions are presented for 7 TeV data. The results are compared to the predictions of modern Monte Carlo generators. The production of vector bosons plus heavy flavors is sensitive to the c and b quark parton distribution functions (PDFs) and gluon splitting effects. Measurements of W + c and Z + b (b ) are reported and compared to predictions based on various PDFs in 4 and 5 flavour schemes. An overview of the results is given.
Highlights
The production of vector bosons in association with jets is an important probe for perturbative quantum chromo dynamics (QCD)
The theoretical predictions for the W + b jets processes with next-to-leading order (NLO) perturbative QCD calculation have recently become available.The data is compared with the NLO predictions calculated by MCFM [23] which is corrected for hadronization and double parton interaction effects, with the POWHEG [24] interfaced to PYTHIA which is corrected for the effect of double parton interactions, and with the prediction from ALPGEN interfaced to HERWIG [25, 26] and JIMMY [27] scaled by the NNLO inclusive W normalization factor
Measurements on the p√rocesses of single W, Z boson production in association with jets in 4.6 fb−1 of pp collision data at s = 7 TeV collected with ATLAS detector at Large Hadron Collider (LHC) are summarized
Summary
The production of vector bosons in association with jets is an important probe for perturbative quantum chromo dynamics (QCD) These processes are non-negligible backgrounds for new physics searches and Higgs boson measurements. NLO matrix element calculations have been available for vector boson associated b quark production at parton level [4,5,6,7] The measurements on these vector boson plus jets are compared with a number of new theoretical predictions. Some experimental uncertainties and effects from non-perturbative processes, such as hadronisation and multi-parton interactions, are greatly reduced in the ratio This allows precision comparisons with state-of-the-art Monte Carlo simulations and NLO perturbative QCD calculations. The theoretical predictions describe the data fairly well, 04045-p.3
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