Search for s -channel single top-quark production in proton–proton collisions at root s=8 TeV with the ATLAS detector

, The ATLAS collaboration (2015) Search for s -channel single top-quark production in proton–proton collisions at root s=8 TeV with the ATLAS detector. Physics Letters B, 740. pp. 118-136. ISSN 0370-2693

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Abstract

This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb(-1). Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single topquark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of sigma(s) = 5.0 +/- 4.3 pb, consistent with the Standard Model expectation

Item Type:
Journal Article
Journal or Publication Title:
Physics Letters B
Additional Information:
© 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/). Funded by SCOAP3.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
73994
Deposited By:
Deposited On:
18 Jun 2015 05:58
Refereed?:
No
Published?:
Published
Last Modified:
01 Dec 2020 02:43