Measurement of the Z+b-jet cross-section in pp collisions at √s = 7 TeV in the forward region

The preprint is available here.

More detailed information: ANA note 2014-042

arXiv: 1411.1264 JHEP01(2015)064

Abstract

Abstract 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/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 -)+b-jet) = 295 60 (stat) 51 (syst) 10 (lumi) fb

for pT(jet)> 10 GeV, and

σ(Z/γ*+μ -)+b-jet) = 128 36 (stat) 22 (syst) 5 (lumi) fb

for pT(jet)> 20 GeV.

Figures

(Note, pdf versions are available under attachments).
Caption Figure
Figure 1: Mcorr distribution for (left) pT (jet) > 10 GeV and (right) pT (jet) > 20 GeV. Data (black points) are compared to the template fit results. The uncertainties shown are statistical only. Fig1a.png Fig1b.png
Figure 2: Efficiency of b-tagging as function of the jet transverse momentum. The uncertainties shown are statistical only. Fig2.png
Figure 3: Z+b-jet cross-section for two pT (jet) thresholds. The colour band shows the LHCb measurement (with the inner orange band showing the statistical uncertainty, and the outer yellow band showing the total uncertainty). The points with error bars correspond to the theoretical predictions with the inner error bars indicating their PDF uncertainties. These cross-sections are evaluated within the fiducial region pT(μ) > 20 GeV, 60 GeV < M (μ−μ+ ) < 120 GeV, 2 < η(jet) < 4.5, 2 < η(μ) < 4.5 and ∆R(jet, μ) > 0.4. Fig3.png
-- KatharinaMueller - 2014-11-06
Topic attachments
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Unknown file formateps Fig1a.eps r1 manage 66.9 K 2014-11-06 - 11:50 KatharinaMueller  
PDFpdf Fig1a.pdf r1 manage 15.3 K 2014-11-06 - 11:50 KatharinaMueller  
PNGpng Fig1a.png r1 manage 11.6 K 2014-11-06 - 11:50 KatharinaMueller  
Unknown file formateps Fig1b.eps r1 manage 64.3 K 2014-11-06 - 11:50 KatharinaMueller  
PDFpdf Fig1b.pdf r1 manage 15.0 K 2014-11-06 - 11:50 KatharinaMueller  
PNGpng Fig1b.png r1 manage 11.3 K 2014-11-06 - 11:50 KatharinaMueller  
Unknown file formateps Fig2.eps r1 manage 51.8 K 2014-11-06 - 11:50 KatharinaMueller  
PDFpdf Fig2.pdf r1 manage 14.3 K 2014-11-06 - 11:50 KatharinaMueller  
PNGpng Fig2.png r1 manage 12.4 K 2014-11-06 - 11:50 KatharinaMueller  
Unknown file formateps Fig3.eps r2 r1 manage 8.9 K 2015-07-17 - 16:49 PhilipIlten  
PDFpdf Fig3.pdf r2 r1 manage 14.1 K 2015-07-17 - 16:49 PhilipIlten  
PNGpng Fig3.png r2 r1 manage 22.1 K 2015-07-17 - 16:48 PhilipIlten  
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