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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
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.ORCID-id: 0000-0001-6945-1916
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.ORCID-id: 0000-0003-3867-0336
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
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Rekke forfattare: 28822018 (engelsk)Inngår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 779, s. 24-45Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier, 2018. Vol. 779, s. 24-45
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URN: urn:nbn:se:kth:diva-228200DOI: 10.1016/j.physletb.2018.01.042ISI: 000429098900004Scopus ID: 2-s2.0-85046461175OAI: oai:DiVA.org:kth-228200DiVA, id: diva2:1207112
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QC 20180518

Tilgjengelig fra: 2018-05-18 Laget: 2018-05-18 Sist oppdatert: 2018-11-13bibliografisk kontrollert

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Kastanas, Konstatinos A.Lund-Jensen, BengtOhm, ChristianRipellino, GiuliaSidebo, P. EdvinStrandberg, Jonas

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