Title
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Measurement of top quark polarisation in t-channel single top quark production
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Author
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Institution/Organisation
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CMS Collaboration
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Abstract
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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 8TeV 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. |
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Language
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English
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Source (journal)
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Journal of high energy physics. - Bristol
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Publication
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Bristol
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2016
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ISSN
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1126-6708
1029-8479
[online]
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DOI
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10.1007/JHEP04(2016)073
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Volume/pages
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4
(2016)
, 42 p.
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Article Reference
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073
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ISI
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000374339700001
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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