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Observation of the Associated Production of a Single Top Quark and a W Boson in pp Collisions at √s=8  TeV

Observation of the Associated Production of a Single Top Quark and a W Boson in pp Collisions at √s=8  TeV
Observation of the Associated Production of a Single Top Quark and a W Boson in pp Collisions at √s=8  TeV
The first observation of the associated production of a single top quark and a W boson is presented. The analysis is based on a data set corresponding to an integrated luminosity of 12.2??fb?1 of proton-proton collisions at s?=8??TeV recorded by the CMS experiment at the LHC. Events with two leptons and a jet originating from a b quark are selected. A multivariate analysis based on kinematic and topological properties is used to separate the signal from the dominant tt¯ background. An excess consistent with the signal hypothesis is observed, with a significance which corresponds to 6.1 standard deviations above a background-only hypothesis. The measured production cross section is 23.4±5.4??pb, in agreement with the standard model prediction
Chatrchyan, S.
e4af2e92-90c7-4a2f-a87a-471171a1207d
Khachatryan, V.
3ea104df-0bcf-40fc-a764-2311921cf360
Sirunyan, A.M.
846a7137-803d-49de-aae7-d6b85519e829
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Chatrchyan, S.
e4af2e92-90c7-4a2f-a87a-471171a1207d
Khachatryan, V.
3ea104df-0bcf-40fc-a764-2311921cf360
Sirunyan, A.M.
846a7137-803d-49de-aae7-d6b85519e829
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

Chatrchyan, S. , The CMS Collaboration (2014) Observation of the Associated Production of a Single Top Quark and a W Boson in pp Collisions at √s=8  TeV. Physical Review Letters, 112 (23), [231802]. (doi:10.1103/PhysRevLett.112.231802).

Record type: Article

Abstract

The first observation of the associated production of a single top quark and a W boson is presented. The analysis is based on a data set corresponding to an integrated luminosity of 12.2??fb?1 of proton-proton collisions at s?=8??TeV recorded by the CMS experiment at the LHC. Events with two leptons and a jet originating from a b quark are selected. A multivariate analysis based on kinematic and topological properties is used to separate the signal from the dominant tt¯ background. An excess consistent with the signal hypothesis is observed, with a significance which corresponds to 6.1 standard deviations above a background-only hypothesis. The measured production cross section is 23.4±5.4??pb, in agreement with the standard model prediction

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Published date: 9 June 2014
Organisations: Physics & Astronomy

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Local EPrints ID: 369469
URI: http://eprints.soton.ac.uk/id/eprint/369469
PURE UUID: 3f5d2b87-0f0c-451e-aadd-0d02d627cc74
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

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Date deposited: 26 Sep 2014 14:50
Last modified: 12 Nov 2019 01:44

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Contributors

Author: S. Chatrchyan
Author: V. Khachatryan
Author: A.M. Sirunyan
Corporate Author: The CMS Collaboration

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