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


CMS Collaboration; Canelli, M F; Chiochia, V; Kilminster, B; Robmann, P; et al (2015). Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $\sqrt{s}=8$. Journal of High Energy Physics:1-33.

Abstract

A measurement of the W boson helicity is presented, 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. 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$_R$.

Abstract

A measurement of the W boson helicity is presented, 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. 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$_R$.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Date:2015
Deposited On:05 Feb 2015 08:27
Last Modified:14 Feb 2018 08:56
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP01(2015)053
Related URLs:http://arxiv.org/abs/1410.1154

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