Measurement of top quark polarisation in t-channel single top quark production
Name
Measurement of top.pdf
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1.02 MB
Format
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Checksum (MD5)
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Author(s)
Apyan, Aram
Barbieri, Riccardo
Baty, Austin Alan
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Demiragli, Zeynep
Di Matteo, Leonardo
Gomez-Ceballos, Guillelmo
Date Issued
April 2016
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag/SISSA
Citation
The CMS collaboration et al. “Measurement of Top Quark Polarisation in T-Channel Single Top Quark Production.” Journal of High Energy Physics 2016.4 (2016): n. pag.
Version
Final published version
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[superscript −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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP04(2016)073
