Study of W boson production in association with beauty and charm

The paper is available here.

arXiv: 1505.04051, LHCB-PAPER-2015-021

More detailed information: ANA note 2014-076

Abstract

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+jet events that originate from beauty and charm quarks is measured, along with the charge asymmetries of the W+b and W+c production cross-sections. The ratio of the W+jet to Z+jet production cross-sections is also measured using the Z → μμ decay. All results are in agreement with Standard Model predictions.

Figures

(Note, eps versions are available under attachments).

Caption Figure
Figure 1: Distributions of pT(μ)/pT (jμ ) with fits overlaid from (top) √s = 7 TeV and (bottom) 8 TeV data for (left) μ+ and (right) μ−. Fig1a.png Fig1b.png
Figure 2: (top) Two-dimensional SV-tag BDT distribution and (bottom) fit for events in the subsample with pT (μ)/pT (jμ) > 0.9. Combined data for s = √7 and 8 TeV for both muon charges are shown. Fig2a.png Fig2b.png
Figure 2 cont: Projections onto the (top) BDT(bc|udsg) and (bottom) BDT(b|c) axes. Combined data for s = √7 and 8 TeV for both muon charges are shown. Fig2c.png Fig2d.png
Figure 3: (Top) Two-dimensional SV-tag BDT distribution and (bottom) fit for events in the subsample with 0.5 < pT(μ)/pT(jμ ) < 0.6, projected onto the (3rd) BDT(bc|udsg) and (4th) BDT(b c) axes. Combined data for s = √7 and 8 TeV for both muon charges are shown. Fig3a.png Fig3b.png
Figure 3 cont: Projections onto the (top) BDT(bc|udsg) and (bottom) BDT(b|c) axes for the subsample with 0.5 < pT(μ)/pT(jμ ) < 0.6. Combined data for s = √7 and 8 TeV for both muon charges are shown. Fig3c.png Fig3d.png
Figure 4: Projections of simultaneous fits of (top) Mcor and (bottom) SV track multiplicity for the SV-tagged subsample with BDT(bc |udsg) > 0.2 and pT(μ)/pT (jμ) > 0.9. The highest Mcor bin includes candidates with Mcor > 10 GeV. Combined data for √s = 7 and 8 TeV for both muon charges are shown. Fig4a.png Fig4b.png
Figure 5: Fits to pT (μ)/pT(jμ ) distributions for c-tagged data samples for s = √7 and 8 TeV. Fig5a.png Fig5b.png
Figure 5 cont: Fits to pT (μ)/pT(jμ ) distributions for b-tagged data samples for s = √7 and 8 TeV. Fig5c.png Fig5d.png
Figure 6: Fits to the pT(SV)/pT (j) distributions in (left) 7 TeV and (right) 8 TeV data for candidates with pT(μ)/pT (jμ ) > 0.9 and BDT(bc|udsg) > 0.2. Fig6a.png Fig6b.png

-- KatharinaMueller - 2015-06-04

Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formateps Fig1a.eps r1 manage 17.3 K 2015-06-04 - 12:24 KatharinaMueller  
PDFpdf Fig1a.pdf r1 manage 16.0 K 2015-06-04 - 12:24 KatharinaMueller  
PNGpng Fig1a.png r1 manage 6.8 K 2015-06-04 - 12:24 KatharinaMueller  
Unknown file formateps Fig1b.eps r1 manage 17.0 K 2015-06-04 - 12:24 KatharinaMueller  
PDFpdf Fig1b.pdf r1 manage 15.9 K 2015-06-04 - 12:24 KatharinaMueller  
PNGpng Fig1b.png r1 manage 6.8 K 2015-06-04 - 12:24 KatharinaMueller  
Unknown file formateps Fig2a.eps r1 manage 17.0 K 2015-06-04 - 12:24 KatharinaMueller  
PDFpdf Fig2a.pdf r1 manage 14.9 K 2015-06-04 - 12:24 KatharinaMueller  
PNGpng Fig2a.png r1 manage 13.4 K 2015-06-04 - 12:24 KatharinaMueller  
Unknown file formateps Fig2b.eps r1 manage 17.8 K 2015-06-04 - 12:26 KatharinaMueller  
PDFpdf Fig2b.pdf r1 manage 15.2 K 2015-06-04 - 12:26 KatharinaMueller  
PNGpng Fig2b.png r1 manage 13.3 K 2015-06-04 - 12:26 KatharinaMueller  
Unknown file formateps Fig2c.eps r1 manage 12.4 K 2015-06-04 - 12:26 KatharinaMueller  
PDFpdf Fig2c.pdf r1 manage 15.0 K 2015-06-04 - 12:26 KatharinaMueller  
PNGpng Fig2c.png r1 manage 21.2 K 2015-06-04 - 12:26 KatharinaMueller  
Unknown file formateps Fig2d.eps r1 manage 12.9 K 2015-06-04 - 12:26 KatharinaMueller  
PDFpdf Fig2d.pdf r1 manage 15.3 K 2015-06-04 - 12:26 KatharinaMueller  
PNGpng Fig2d.png r1 manage 20.4 K 2015-06-04 - 12:26 KatharinaMueller  
Unknown file formateps Fig3a.eps r1 manage 15.6 K 2015-06-04 - 12:27 KatharinaMueller  
PDFpdf Fig3a.pdf r1 manage 14.8 K 2015-06-04 - 12:27 KatharinaMueller  
PNGpng Fig3a.png r1 manage 13.1 K 2015-06-04 - 12:27 KatharinaMueller  
Unknown file formateps Fig3b.eps r1 manage 17.2 K 2015-06-04 - 12:27 KatharinaMueller  
PDFpdf Fig3b.pdf r1 manage 15.1 K 2015-06-04 - 12:27 KatharinaMueller  
PNGpng Fig3b.png r1 manage 13.2 K 2015-06-04 - 12:27 KatharinaMueller  
Unknown file formateps Fig3c.eps r1 manage 12.0 K 2015-06-04 - 12:27 KatharinaMueller  
PDFpdf Fig3c.pdf r1 manage 15.0 K 2015-06-04 - 12:27 KatharinaMueller  
PNGpng Fig3c.png r1 manage 11.0 K 2015-06-04 - 12:27 KatharinaMueller  
Unknown file formateps Fig3d.eps r1 manage 13.3 K 2015-06-04 - 12:31 KatharinaMueller  
PDFpdf Fig3d.pdf r1 manage 15.4 K 2015-06-04 - 12:31 KatharinaMueller  
PNGpng Fig3d.png r1 manage 20.9 K 2015-06-04 - 12:31 KatharinaMueller  
Unknown file formateps Fig4a.eps r1 manage 11.9 K 2015-06-04 - 12:28 KatharinaMueller  
PDFpdf Fig4a.pdf r1 manage 15.0 K 2015-06-04 - 12:28 KatharinaMueller  
PNGpng Fig4a.png r1 manage 21.5 K 2015-06-04 - 12:28 KatharinaMueller  
Unknown file formateps Fig4b.eps r1 manage 10.5 K 2015-06-04 - 12:28 KatharinaMueller  
PDFpdf Fig4b.pdf r1 manage 14.2 K 2015-06-04 - 12:28 KatharinaMueller  
PNGpng Fig4b.png r1 manage 10.2 K 2015-06-04 - 12:28 KatharinaMueller  
Unknown file formateps Fig5a.eps r1 manage 16.6 K 2015-06-04 - 12:28 KatharinaMueller  
PDFpdf Fig5a.pdf r1 manage 15.5 K 2015-06-04 - 12:28 KatharinaMueller  
PNGpng Fig5a.png r1 manage 6.2 K 2015-06-04 - 12:28 KatharinaMueller  
Unknown file formateps Fig5b.eps r1 manage 16.5 K 2015-06-04 - 12:37 KatharinaMueller  
PDFpdf Fig5b.pdf r1 manage 15.5 K 2015-06-04 - 12:37 KatharinaMueller  
PNGpng Fig5b.png r1 manage 6.2 K 2015-06-04 - 12:37 KatharinaMueller  
Unknown file formateps Fig5c.eps r1 manage 16.9 K 2015-06-04 - 12:31 KatharinaMueller  
PDFpdf Fig5c.pdf r1 manage 15.5 K 2015-06-04 - 12:31 KatharinaMueller  
PNGpng Fig5c.png r1 manage 6.5 K 2015-06-04 - 12:31 KatharinaMueller  
Unknown file formateps Fig5d.eps r1 manage 16.1 K 2015-06-04 - 12:31 KatharinaMueller  
PDFpdf Fig5d.pdf r1 manage 15.4 K 2015-06-04 - 12:31 KatharinaMueller  
PNGpng Fig5d.png r1 manage 6.3 K 2015-06-04 - 12:31 KatharinaMueller  
Unknown file formateps Fig6a.eps r1 manage 14.7 K 2015-06-04 - 12:29 KatharinaMueller  
PDFpdf Fig6a.pdf r1 manage 15.8 K 2015-06-04 - 12:29 KatharinaMueller  
PNGpng Fig6a.png r1 manage 23.8 K 2015-06-04 - 12:29 KatharinaMueller  
Unknown file formateps Fig6b.eps r1 manage 14.4 K 2015-06-04 - 12:29 KatharinaMueller  
PDFpdf Fig6b.pdf r1 manage 15.6 K 2015-06-04 - 12:29 KatharinaMueller  
PNGpng Fig6b.png r1 manage 23.9 K 2015-06-04 - 12:29 KatharinaMueller  
Edit | Attach | Watch | Print version | History: r4 < r3 < r2 < r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r4 - 2015-08-13 - KatharinaMueller
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    LHCb All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2019 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback