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Search for H -> gamma gamma produced in association with top quarks and constraints on the Yukawa coupling between the top quark and the Higgs boson using data taken at 7 TeV and 8 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 2896
2015 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 740, 222-242 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 740, 222-242 p.
Keyword [en]
Higgs boson, Diphoton decay, t(t)over-barH, Top quark, Yukawa coupling, tH
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-160648DOI: 10.1016/j.physletb.2014.11.049ISI: 000347046200030Scopus ID: 2-s2.0-84916883721OAI: oai:DiVA.org:kth-160648DiVA: diva2:790844
Funder
Knut and Alice Wallenberg Foundation
Note

QC 20150226

Available from: 2015-02-26 Created: 2015-02-26 Last updated: 2017-12-04Bibliographically approved

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Strandberg, Jonas

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