Measurement of the Z+b-jet cross-section in pp collisions at $ \sqrts $ = 7 TeV in the forward regionстатья
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Дата последнего поиска статьи во внешних источниках: 29 февраля 2016 г.
Аннотация:The associated production of a Z boson or an off-shell photon γ∗ with a bottom quark in the forward region is studied using proton-proton collisions at a centre-of-mass energy of 7TeV. The Z bosons are reconstructed in the Z/γ∗→μ+μ− final state from muons with a transverse momentum larger than 20 GeV , while two transverse momentum thresholds are considered for jets (10 GeV and 20 GeV ). Both muons and jets are reconstructed in the pseudorapidity range 2.0<η<4.5. The results are based on data corresponding to 1.0 fb−1 recorded in 2011 with the LHCb detector. The measurement of the Z+b-jet cross-section is normalized to the Z+jet cross-section. The measured cross-sections are
σ(Z/γ∗(μ+μ−)+b-jet)=295±60(stat)±51(syst)±10(lumi)fb
for pT(jet)>10GeV, and
σ(Z/γ∗(μ+μ−)+b-jet)=128±36(stat)±22(syst)±5(lumi)fb
for pT(jet)>20GeV.