# 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$_R$.

## Citations

13 citations in Web of Science®
4 citations in Scopus®

## Altmetrics

Detailed statistics

Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics 2015 05 Feb 2015 08:27 29 May 2016 19:25 Springer 1029-8479 Publisher DOI. An embargo period may apply. https://doi.org/10.1007/JHEP01(2015)053 http://arxiv.org/abs/1410.1154

 Preview
Content: Accepted Version
Filetype: PDF
Size: 690kB
View at publisher
 Preview
Content: Published Version
Filetype: PDF
Size: 634kB

## TrendTerms

TrendTerms displays relevant terms of the abstract of this publication and related documents on a map. The terms and their relations were extracted from ZORA using word statistics. Their timelines are taken from ZORA as well. The bubble size of a term is proportional to the number of documents where the term occurs. Red, orange, yellow and green colors are used for terms that occur in the current document; red indicates high interlinkedness of a term with other terms, orange, yellow and green decreasing interlinkedness. Blue is used for terms that have a relation with the terms in this document, but occur in other documents.
You can navigate and zoom the map. Mouse-hovering a term displays its timeline, clicking it yields the associated documents.