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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
Univ Mohamed Premier, Fac Sci, Oujda, Morocco;LPTPM, Oujda, Morocco.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.ORCID iD: 0000-0002-1253-8583
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. Georg August Univ, Inst Phys 2, Gottingen, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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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
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-353207DOI: 10.1016/j.physletb.2018.01.042ISI: 000429098900004OAI: oai:DiVA.org:uu-353207DiVA, id: diva2:1217383
Funder
Swedish Research CouncilEU, European Research CouncilEU, FP7, Seventh Framework ProgrammeEU, Horizon 2020
Note

For complete list of authors see http://dx.doi.org/10.1016/j.physletb.2018.01.042

Available from: 2018-06-13 Created: 2018-06-13 Last updated: 2018-07-25Bibliographically approved

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Bergeås Kuutmann, ElinBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudGradin, P. O. JoakimIsacson, Max F.Mårtensson, Mikael U.F.Öhman, HenrikRangel Smith, CamilaSales De Bruin, Pedro H.

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Bergeås Kuutmann, ElinBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudGradin, P. O. JoakimIsacson, Max F.Mårtensson, Mikael U.F.Öhman, HenrikRangel Smith, CamilaSales De Bruin, Pedro H.
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High Energy PhysicsDepartment of Physics and Astronomy
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Physics Letters B
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