Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton plus jets final states produced in pp collisions at root s=8 TeV
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
The W boson helicity fractions from top quark decays in tt events are measured using data from proton–
proton collisions at a centre-of-mass energy of 8 TeV. 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. These measurements of the W boson helicity fractions are the most accurate to date
and they agree with the predictions from the standard model.
proton collisions at a centre-of-mass energy of 8 TeV. 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. These measurements of the W boson helicity fractions are the most accurate to date
and they agree with the predictions from the standard model.
Date Issued
2016-10-11
Date Acceptance
2016-10-04
Citation
Physics Letters B, 2016, 762, pp.512-534
ISSN
0370-2693
Publisher
Elsevier
Start Page
512
End Page
534
Journal / Book Title
Physics Letters B
Volume
762
Copyright Statement
© 2016 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/).
(http://creativecommons.org/licenses/by/4.0/).
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000388473700071&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Nuclear
Physics, Particles & Fields
Physics
CMS
Top
Anomalous couplings
Helicity
PARTON DISTRIBUTIONS
LHC
COUPLINGS
Nuclear & Particles Physics
0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics
Publication Status
Published