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 the W þ b and W þ c production cross sections. The ratio
of the W 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.