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Title: Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton+jets final states produced in pp collisions at s = 8 TeV

Abstract

The W boson helicity fractions from top quark decays in $$t\bar{t}$$ events are measured using data from proton–proton collisions at a centre-of-mass energy of 8TeV . The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8 fb -1 . Events are reconstructed with either one muon or one electron, along with four jets in the final state, with two of the jets being identified as originating from b quarks. The measured helicity fractions from both channels are combined, yielding F0=0.681±0.012(stat)±0.023(syst) , F L = 0.323 ± 0.008(stat) ± 0.014(syst), and F R = -0.004 ± 0.005(stat) ± 0.014(syst) for the longitudinal, left-, and right-handed components of the helicity, respectively. Furthermore, these measurements of the W boson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1329074
Alternate Identifier(s):
OSTI ID: 1289931
Report Number(s):
FERMILAB-PUB-16-192-CMS; CMS-TOP-13-008; CERN-EP-2016-118; arXiv:1605.09047
Journal ID: ISSN 0370-2693; 1466294
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 762; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CMS; physics; top; anomalous couplings; helicity

Citation Formats

Khachatryan, Vardan. Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton+jets final states produced in pp collisions at s=8TeV. United States: N. p., 2016. Web. doi:10.1016/j.physletb.2016.10.007.
Khachatryan, Vardan. Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton+jets final states produced in pp collisions at s=8TeV. United States. doi:10.1016/j.physletb.2016.10.007.
Khachatryan, Vardan. Tue . "Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton+jets final states produced in pp collisions at s=8TeV". United States. doi:10.1016/j.physletb.2016.10.007.
@article{osti_1329074,
title = {Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton+jets final states produced in pp collisions at s=8TeV},
author = {Khachatryan, Vardan},
abstractNote = {The W boson helicity fractions from top quark decays in $t\bar{t}$ events are measured using data from proton–proton collisions at a centre-of-mass energy of 8TeV . The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8 fb-1 . Events are reconstructed with either one muon or one electron, along with four jets in the final state, with two of the jets being identified as originating from b quarks. The measured helicity fractions from both channels are combined, yielding F0=0.681±0.012(stat)±0.023(syst) , FL = 0.323 ± 0.008(stat) ± 0.014(syst), and FR = -0.004 ± 0.005(stat) ± 0.014(syst) for the longitudinal, left-, and right-handed components of the helicity, respectively. Furthermore, these measurements of the W boson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.},
doi = {10.1016/j.physletb.2016.10.007},
journal = {Physics Letters. Section B},
number = C,
volume = 762,
place = {United States},
year = {2016},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2016.10.007

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Cited by: 7 works
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