The University of Southampton
University of Southampton Institutional Repository
Warning ePrints Soton is experiencing an issue with some file downloads not being available. We are working hard to fix this. Please bear with us.

Measurement of the ratio B(t→Wb)/B(t→Wq)B(t→Wb)/B(t→Wq) in pp collisions at View the √s=8 TeV

Measurement of the ratio B(t→Wb)/B(t→Wq)B(t→Wb)/B(t→Wq) in pp collisions at View the √s=8 TeV
Measurement of the ratio B(t→Wb)/B(t→Wq)B(t→Wb)/B(t→Wq) in pp collisions at View the √s=8 TeV
The ratio of the top-quark branching fractions R=B(t→Wb)/B(t→Wq)R=B(t→Wb)/B(t→Wq), where the denominator includes the sum over all down-type quarks (q=b,s,dq=b,s,d), is measured in the View the MathML sourcett¯ dilepton final state with proton–proton collision data at View the MathML sources=8 TeV from an integrated luminosity of 19.7 fb−1, collected with the CMS detector. In order to quantify the purity of the signal sample, the cross section is measured by fitting the observed jet multiplicity, thereby constraining the signal and background contributions. By counting the number of b jets per event, an unconstrained value of View the MathML sourceR=1.014±0.003(stat.)±0.032(syst.) is measured, in a good agreement with current precision measurements in electroweak and flavour sectors. A lower limit R>0.955R>0.955 at the 95% confidence level is obtained after requiring R≤1R≤1, and a lower limit on the Cabibbo–Kobayashi–Maskawa matrix element |Vtb|>0.975|Vtb|>0.975 is set at 95% confidence level. The result is combined with a previous CMS measurement of the t -channel single-top-quark cross section to determine the top-quark total decay width, View the MathML sourceΓt=1.36±0.02(stat.)−0.11+0.14(syst.) GeV.
0370-2693
33-57
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

The CMS Collaboration (2014) Measurement of the ratio B(t→Wb)/B(t→Wq)B(t→Wb)/B(t→Wq) in pp collisions at View the √s=8 TeV. Physics Letters B, 736, 33-57. (doi:10.1016/j.physletb.2014.06.076).

Record type: Article

Abstract

The ratio of the top-quark branching fractions R=B(t→Wb)/B(t→Wq)R=B(t→Wb)/B(t→Wq), where the denominator includes the sum over all down-type quarks (q=b,s,dq=b,s,d), is measured in the View the MathML sourcett¯ dilepton final state with proton–proton collision data at View the MathML sources=8 TeV from an integrated luminosity of 19.7 fb−1, collected with the CMS detector. In order to quantify the purity of the signal sample, the cross section is measured by fitting the observed jet multiplicity, thereby constraining the signal and background contributions. By counting the number of b jets per event, an unconstrained value of View the MathML sourceR=1.014±0.003(stat.)±0.032(syst.) is measured, in a good agreement with current precision measurements in electroweak and flavour sectors. A lower limit R>0.955R>0.955 at the 95% confidence level is obtained after requiring R≤1R≤1, and a lower limit on the Cabibbo–Kobayashi–Maskawa matrix element |Vtb|>0.975|Vtb|>0.975 is set at 95% confidence level. The result is combined with a previous CMS measurement of the t -channel single-top-quark cross section to determine the top-quark total decay width, View the MathML sourceΓt=1.36±0.02(stat.)−0.11+0.14(syst.) GeV.

This record has no associated files available for download.

More information

Accepted/In Press date: 29 June 2014
e-pub ahead of print date: 3 July 2014
Published date: September 2014
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 411089
URI: http://eprints.soton.ac.uk/id/eprint/411089
ISSN: 0370-2693
PURE UUID: f1338c36-449f-4320-85a4-ca349a1532d0
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

Catalogue record

Date deposited: 13 Jun 2017 16:34
Last modified: 10 Nov 2021 03:19

Export record

Altmetrics

Contributors

Author: Vardan Khachatryan
Corporate Author: The CMS Collaboration

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×