Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $ \sqrt{s}=8 $ TeV

Khachatryan, Vardan

doi:10.1007/JHEP01(2015)053

Title: Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $$ \sqrt{s}=8 $$ TeV

Abstract

We presented a measurement of the W boson helicity, where the W boson originates from the decay of a top quark produced in pp collisions. The event selection, optimized for reconstructing a single top quark in the final state, requires exactly one isolated lepton (muon or electron) and exactly two jets, one of which is likely to originate from the hadronization of a bottom quark. The analysis is performed using data recorded at a center-of-mass energy of 8 TeV with the CMS detector at the CERN LHC in 2012. We also found that the data sample corresponds to an integrated luminosity of 19.7 fb^-1. The measured helicity fractions are F_L = 0.298 ± 0.028 (stat) ± 0.032(syst), F ₀ = 0.720 ± 0.039 (stat) ± 0.037(syst), and F_R= -0.018 ± 0.019 (stat) ± 0.011(syst). These results are used to set limits on the real part of the tWb anomalous couplings, g _L and g _R.

Authors:

Khachatryan, Vardan ^[1]

Yerevan Physics Inst. (YerPhI) (Armenia). et al.

Publication Date:: Mon Jan 12 00:00:00 EST 2015

Research Org.:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Org.:: CMS Collaboration

OSTI Identifier:: 1234852

Report Number(s):: FERMILAB-PUB-14-446-CMS; CERN-PH-EP-2014-242; CMS-TOP-12-020
Journal ID: ISSN 1029-8479; arXiv eprint number arXiv:1410.1154; TRN: US1500489

Grant/Contract Number:: AC02-07CH11359

Resource Type:: Accepted Manuscript

Journal Name:: Journal of High Energy Physics (Online)

Additional Journal Information:: Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2015; Journal Issue: 1; Journal ID: ISSN 1029-8479

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; electroweak interaction; hadron-hadron scattering

Citation Formats


                    Khachatryan, Vardan. Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $ \sqrt{s}=8 $ TeV.  United States: N. p., 2015. 
Web.  doi:10.1007/JHEP01(2015)053.

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                    Khachatryan, Vardan. Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $ \sqrt{s}=8 $ TeV.  United States.  https://doi.org/10.1007/JHEP01(2015)053

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                    Khachatryan, Vardan. Mon .  
"Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $ \sqrt{s}=8 $ TeV".  United States.  https://doi.org/10.1007/JHEP01(2015)053.  https://www.osti.gov/servlets/purl/1234852.

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@article{osti_1234852,

  title        = {Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $ \sqrt{s}=8 $ TeV},

  author       = {Khachatryan, Vardan},

  abstractNote = {We presented a measurement of the W boson helicity, where the W boson originates from the decay of a top quark produced in pp collisions. The event selection, optimized for reconstructing a single top quark in the final state, requires exactly one isolated lepton (muon or electron) and exactly two jets, one of which is likely to originate from the hadronization of a bottom quark. The analysis is performed using data recorded at a center-of-mass energy of 8 TeV with the CMS detector at the CERN LHC in 2012. We also found that the data sample corresponds to an integrated luminosity of 19.7 fb-1. The measured helicity fractions are F L = 0.298 ± 0.028 (stat) ± 0.032(syst), F 0 = 0.720 ± 0.039 (stat) ± 0.037(syst), and F R = -0.018 ± 0.019 (stat) ± 0.011(syst). These results are used to set limits on the real part of the tWb anomalous couplings, g L and g R.},

  doi          = {10.1007/JHEP01(2015)053},

  journal      = {Journal of High Energy Physics (Online)},

  number       = 1,

  volume       = 2015,

  place        = {United States},

  year         = {Mon Jan 12 00:00:00 EST 2015},

  month        = {Mon Jan 12 00:00:00 EST 2015}

}

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