Study of W boson production in association with beauty and charm
نویسنده
چکیده
The associated production of a W boson with a jet originating from either a light parton or heavy-flavor quark is studied in the forward region using proton-proton collisions. The analysis uses data corresponding to integrated luminosities of 1.0 and 2.0 fb−1 collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, respectively. The W bosons are reconstructed using the W → μν decay and muons with a transverse momentum, pT, larger than 20 GeV in the pseudorapidity range 2.0 < η < 4.5. The partons are reconstructed as jets with pT > 20 GeV and 2.2 < η < 4.2. The sum of the muon and jet momenta must satisfy pT > 20 GeV. The fraction of W þ jet events that originate from beauty and charm quarks is measured, along with the charge asymmetries of theW þ b andW þ c production cross sections. The ratio of theW þ jet to Z þ jet production cross sections is also measured using the Z → μμ decay. All results are in agreement with Standard Model predictions.
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