Measurement of top quark polarisation in t-channel single top quark production
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
A first measurement of the top quark spin asymmetry, sensitive to the top quark polarisation, in t-channel single top quark production is presented. It is based on a sample of pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb−1. A high-purity sample of t-channel single top quark events with an isolated muon is selected. Signal and background components are estimated using a fit to data. A differential cross section measurement, corrected for detector effects, of an angular observable sensitive to the top quark polarisation is performed. The differential distribution is used to extract a top quark spin asymmetry of 0.26 ± 0.03(stat) ± 0.10(syst), which is compatible with a p-value of 4.6% with the standard model prediction of 0.44.
Date Issued
2016-04-13
Date Acceptance
2016-03-21
Citation
Journal of High Energy Physics, 2016, 2016
ISSN
1126-6708
Publisher
Springer Verlag
Journal / Book Title
Journal of High Energy Physics
Volume
2016
Copyright Statement
Open Access, Copyright CERN,
for the benefit of the CMS Collaboration.
for the benefit of the CMS Collaboration.
License URL
Subjects
Science & Technology
Physical Sciences
Physics, Particles & Fields
Physics
Hadron-Hadron scattering (experiments)
Top physics
CHARGE ASYMMETRY
LHC
COLLISIONS
EVENTS
DECAYS
Nuclear & Particles Physics
01 Mathematical Sciences
02 Physical Sciences
Publication Status
Published
Article Number
73