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A search for resonances decaying into a Higgs boson and a new particle X in the XH -> qqbb final state with the ATLAS detector
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 28822018 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 779, p. 24-45Article in journal (Refereed) Published
Abstract [en]

A search for heavy resonances decaying into a Higgs boson (H) and a new particle (X) is reported, utilizing 36.1 fb(-1) of proton-proton collision data at root s = 13 TeV collected during 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The particle Xis assumed to decay to a pair of light quarks, and the fully hadronic final state XH -> q (q) over bar 'b (b) over bar is analysed. The search considers the regime of high XH resonance masses, where the X and H bosons are both highly Lorentz-boosted and are each reconstructed using a single jet with large radius parameter. A two-dimensional phase space of XH mass versus X mass is scanned for evidence of a signal, over a range of XH resonance mass values between 1 TeV and 4 TeV, and for X particles with masses from 50 GeV to 1000 GeV. All search results are consistent with the expectations for the background due to Standard Model processes, and 95% CL upper limits are set, as a function of XH and X masses, on the production cross-section of the XH -> q (q) over bar 'b (b) over bar resonance.

Place, publisher, year, edition, pages
2018. Vol. 779, p. 24-45
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-156739DOI: 10.1016/j.physletb.2018.01.042ISI: 000429098900004OAI: oai:DiVA.org:su-156739DiVA, id: diva2:1219856
Available from: 2018-06-18 Created: 2018-06-18 Last updated: 2018-06-18Bibliographically approved

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Abulaiti, YimingÅkerstedt, HenrikBertoli, GabrieleBessidskaia Bylund, OlgaBohm, ChristianCarney, Rebecca M. D.Clément, ChristopheCribbs, Wayne A.Gellerstedt, KarlHellman, StenJon-And, KerstinMilstead, David A.Moa, TorbjörnMolander, SimonShaikh, Nabila W.Shcherbakova, AnnaSilverstein, Samuel B.Sjölin, JörgenStrandberg, SaraUghetto, MichaëlValdes Santurio, EduardoWallängen, Veronica
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Physics Letters B
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