Measurement of the Z+b-jet cross-section in pp collisions at √s = 7 TeV in the forward region
Author(s)Counts, Ian Thomas Hunt; Ilten, Philip James; Williams, M.
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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 7 TeV. The Z bosons are reconstructed in the [Z over γ] * → μ [superscript +] μ [superscript −] 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 [superscript −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 0.1 σ( [Z over γ] *(μ[superscript+] μ[superscript −]) + b-jet) = 295 ± 60 (stat) ± 51 (syst) ± 10 (lumi) fb for p [subscript T] (jet) > 10 GeV, and 0.2 σ( [Z over γ]*(μ[superscript +] μ[superscript −]) + b-jet)=128±36 (stat) ±22 (syst) ±5 (lumi) fb for p [subscript T](jet) > 20 GeV.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal of High Energy Physics
The LHCb collaboration et al. “Measurement of the Z+b-Jet Cross-Section in Pp Collisions at √s = 7 TeV in the Forward Region.” Journal of High Energy Physics 2015.1 (2015).
Final published version