First observation of top quark production in the forward region

The paper is available here.

arXiv:1506.00903, LHCB-PAPER-2015-022

More detailed information: ANA note 2015-019

Abstract

Top quark production in the forward region in proton-proton collisions is observed for the first time. The W +b final state with W → μν is reconstructed using muons with a transverse momentum, pT, larger than 25 GeV in the pseudorapidity range 2.0 < η < 4.5. The b jets are required to have 50 < pT < 100 GeV and 2.2 < η < 4.2, while the transverse component of the sum of the muon and b-jet momenta must satisfy pT > 20 GeV. The results are based on data corresponding to integrated luminosities of 1.0 and 2.0 fb−1 collected at center-of-mass energies of 7 and 8 TeV by LHCb. The inclusive top quark production cross-sections in the fiducial region are

σ(top)[7 TeV] = 239 53 (stat) 38 (syst) fb ,

σ(top)[8 TeV] = 289 43 (stat) 46 (syst) fb .

These results, along with the observed differential yields and charge asymmetries, are in agreement with next-to-leading order Standard Model predictions.

Figures

(Note, eps versions are available under attachments).

Caption Figure
Figure 1: Distribution of pT(μ)/pT (jμ) with fit overlaid for all W +jet candidates. Fig1.png
Figure 2: Results for the inclusive W +jet yield (top) and charge asymmetry (bottom) versus pT (μ + j) compared to SM predictions at NLO obtained using MCFM. The data error bars are smaller than the marker size, the SM uncertainties are highly correlated across pT<\sub>(μ + j) bins. Fig2a.png Fig2b.png
Figure 3: Results for W +c compared to SM predictions at NLO obtained using MCFM. Fig3.png
Figure 4: Distribution of pT (μ)/pT(jμ ) with fit overlaid for all W +b candidates. Fig4.png
Figure 5: Results for the W + b yield (top) and charge asymmetry (bottom) versus pT (μ + b) compared to SM predictions obtained at NLO using MCFM. Fig5a.png Fig5b.png
-- KatharinaMueller - 2015-06-04
Topic attachments
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Unknown file formateps Fig1.eps r1 manage 9.2 K 2015-06-04 - 12:01 KatharinaMueller  
PDFpdf Fig1.pdf r1 manage 13.9 K 2015-06-04 - 12:01 KatharinaMueller  
PNGpng Fig1.png r1 manage 9.6 K 2015-06-04 - 12:01 KatharinaMueller  
Unknown file formateps Fig2a.eps r1 manage 7.2 K 2015-06-04 - 12:01 KatharinaMueller  
PDFpdf Fig2a.pdf r1 manage 13.2 K 2015-06-04 - 12:01 KatharinaMueller  
PNGpng Fig2a.png r1 manage 8.6 K 2015-06-04 - 12:01 KatharinaMueller  
Unknown file formateps Fig2b.eps r1 manage 6.4 K 2015-06-04 - 12:01 KatharinaMueller  
PDFpdf Fig2b.pdf r1 manage 13.2 K 2015-06-04 - 12:01 KatharinaMueller  
PNGpng Fig2b.png r1 manage 9.2 K 2015-06-04 - 12:01 KatharinaMueller  
Unknown file formateps Fig3.eps r1 manage 7.5 K 2015-06-04 - 12:03 KatharinaMueller  
PDFpdf Fig3.pdf r1 manage 13.3 K 2015-06-04 - 12:03 KatharinaMueller  
PNGpng Fig3.png r1 manage 8.5 K 2015-06-04 - 12:03 KatharinaMueller  
Unknown file formateps Fig4.eps r1 manage 9.1 K 2015-06-04 - 12:03 KatharinaMueller  
PDFpdf Fig4.pdf r1 manage 13.7 K 2015-06-04 - 12:03 KatharinaMueller  
PNGpng Fig4.png r1 manage 9.4 K 2015-06-04 - 12:03 KatharinaMueller  
Unknown file formateps Fig5a.eps r1 manage 7.5 K 2015-06-04 - 12:03 KatharinaMueller  
PDFpdf Fig5a.pdf r1 manage 13.4 K 2015-06-04 - 12:03 KatharinaMueller  
PNGpng Fig5a.png r1 manage 8.8 K 2015-06-04 - 12:03 KatharinaMueller  
Unknown file formateps Fig5b.eps r1 manage 7.6 K 2015-06-04 - 12:04 KatharinaMueller  
PDFpdf Fig5b.pdf r1 manage 13.4 K 2015-06-04 - 12:04 KatharinaMueller  
PNGpng Fig5b.png r1 manage 10.2 K 2015-06-04 - 12:04 KatharinaMueller  
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