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Measurement of top quark polarisation in t-channel single top quark production

Measurement of top quark polarisation in t-channel single top quark production
Measurement of top quark polarisation in t-channel single top quark production
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.
1029-8479
073
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 (2016) Measurement of top quark polarisation in t-channel single top quark production. Journal of High Energy Physics, 04, 073. (doi:10.1007/JHEP04(2016)073).

Record type: 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.

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Accepted/In Press date: 21 March 2016
e-pub ahead of print date: 13 April 2016
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 408094
URI: http://eprints.soton.ac.uk/id/eprint/408094
ISSN: 1029-8479
PURE UUID: 2a046cb2-a85f-4e1e-9a77-e96024a96c2e
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

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Date deposited: 11 May 2017 01:09
Last modified: 22 Nov 2021 02:55

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Contributors

Author: Vardan Khachatryan
Corporate Author: The CMS Collaboration

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