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Title: Measurement of the production cross section of a W boson in association with two b jets in pp collisions at $$\sqrt{s}$$ = 8 TeV

Abstract

The production cross section of a W boson in association with two b jets is measured using a sample of proton–proton collisions at s=8TeV collected by the CMS experiment at the CERN LHC. The data sample corresponds to an integrated luminosity of 19.8fb-1. The W bosons are reconstructed via their leptonic decays, W → ℓν, where ℓ= μ or e. The fiducial region studied contains exactly one lepton with transverse momentum pTℓ > 30GeV and pseudorapidity | η ℓ | < 2.1 , with exactly two b jets with pT > 25GeV and | η| < 2.4 and no other jets with pT > 25GeV and | η| < 4.7. The cross section is measured to be σ(p p → W (ℓν) +bb¯)=0.64±0.03(stat)±0.10(syst)±0.06(theo)±0.02(lumi)pb, in agreement with standard model predictions.

Authors:
 [1]
  1. et al.
Publication Date:
Research Org.:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1335123
Alternate Identifier(s):
OSTI ID: 1395328; OSTI ID: 1411651
Report Number(s):
FERMILAB-PUB-16-379-CMS; CMS-SMP-14-020; CERN-EP-2016-190; arXiv:1608.07561
Journal ID: ISSN 1434-6044; 1484162
Grant/Contract Number:  
AC02-07CH11359; AC52-07NA27344; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 76; Journal Issue: 5; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Khacahtryan, V. Measurement of the production cross section of a W boson in association with two b jets in pp collisions at $\sqrt{s}$ = 8 TeV. United States: N. p., 2017. Web. doi:10.1140/epjc/s10052-016-4573-z.
Khacahtryan, V. Measurement of the production cross section of a W boson in association with two b jets in pp collisions at $\sqrt{s}$ = 8 TeV. United States. https://doi.org/10.1140/epjc/s10052-016-4573-z
Khacahtryan, V. Sat . "Measurement of the production cross section of a W boson in association with two b jets in pp collisions at $\sqrt{s}$ = 8 TeV". United States. https://doi.org/10.1140/epjc/s10052-016-4573-z. https://www.osti.gov/servlets/purl/1335123.
@article{osti_1335123,
title = {Measurement of the production cross section of a W boson in association with two b jets in pp collisions at $\sqrt{s}$ = 8 TeV},
author = {Khacahtryan, V.},
abstractNote = {The production cross section of a W boson in association with two b jets is measured using a sample of proton–proton collisions at s=8TeV collected by the CMS experiment at the CERN LHC. The data sample corresponds to an integrated luminosity of 19.8fb-1. The W bosons are reconstructed via their leptonic decays, W → ℓν, where ℓ= μ or e. The fiducial region studied contains exactly one lepton with transverse momentum pTℓ > 30GeV and pseudorapidity | η ℓ | < 2.1 , with exactly two b jets with pT > 25GeV and | η| < 2.4 and no other jets with pT > 25GeV and | η| < 4.7. The cross section is measured to be σ(p p → W (ℓν) +bb¯)=0.64±0.03(stat)±0.10(syst)±0.06(theo)±0.02(lumi)pb, in agreement with standard model predictions.},
doi = {10.1140/epjc/s10052-016-4573-z},
journal = {European Physical Journal. C, Particles and Fields},
number = 5,
volume = 76,
place = {United States},
year = {Sat Feb 11 00:00:00 EST 2017},
month = {Sat Feb 11 00:00:00 EST 2017}
}

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Figures / Tables:

Fig. 1 Fig. 1: The transverse mass distributions (upper) in the tt¯-multijet phase space after fitting to obtain the b tagging efficiency rescale factors, (middle) in the tt¯-multilepton sample after fitting to find the appropriate JES, and (lower) in the W+bb¯ signal sample after fitting simultaneously muon and electron decay channels. Themore » lepton channels are shown separately with the muon sample on the left and the electron sample on the right. The last bin contains overflow events. The shaded area represents the total uncertainty in the simulation after the fit.« less

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  • Elsevier
  • DOI: 10.5167/uzh-92174

Measurement of the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mi>t</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math> production cross section in <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math> collisions at <mml:math altimg="si3.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>1.96</mml:mn><mml:mtext> </mml:mtext><mml:mtext>TeV</mml:mtext></mml:math> using lepton+jets events with lifetime b-tagging
journal, October 2005


Identification of b-quark jets with the CMS experiment
text, January 2013


Measurement of the production cross section for a W boson and two b jets in pp collisions at √s=7 TeV
text, January 2014


Identification and filtering of uncharacteristic noise in the CMS hadron calorimeter
text, January 2010

  • Collaboration, Cms; Amsler, C.; Chiochia, V.
  • Institute of Physics Publishing
  • DOI: 10.5167/uzh-45291

Determination of jet energy calibration and transverse momentum resolution in CMS
text, January 2011


Measurement of the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msubsup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup><mml:mo>−</mml:mo><mml:msubsup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msubsup></mml:math> production asymmetry in 7 TeV pp collisions
journal, July 2012


Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
text, January 2007


The anti-k_t jet clustering algorithm
text, January 2008


QCD radiation in the production of heavy colored particles at the LHC
text, January 2008


Parton distributions for the LHC
text, January 2009


MCFM for the Tevatron and the LHC
text, January 2010


MadGraph 5 : Going Beyond
text, January 2011


W physics at the LHC with FEWZ 2.1
preprint, January 2012


Parton distributions with LHC data
text, January 2012


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