Search for Pairs of Highly Collimated Photon-Jets in pp Collisions at √s=13 TeV with the ATLAS Detector

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dc.contributor.VIAF250674117 (Izen, JM)
dc.contributor.authorAaboud, M.
dc.contributor.authorAad, G.
dc.contributor.authorAbbott, B.
dc.contributor.authorAbdinov, O.
dc.contributor.authorAbeloos, B.
dc.contributor.authorAbhayasinghe, D. K.
dc.contributor.authorAbidi, S. H.
dc.contributor.authorIzen, Joseph M.
dc.contributor.authorMeirose, Bernhard
dc.contributor.authorReeves, Kendall
dc.contributor.authorATLAS Collaboration
dc.contributor.utdAuthorIzen, Joseph M.
dc.contributor.utdAuthorMeirose, Bernhard
dc.contributor.utdAuthorReeves, Kendall
dc.date.accessioned2020-09-12T21:10:31Z
dc.date.available2020-09-12T21:10:31Z
dc.date.issued2019-01-18
dc.description.abstractResults of a search for the pair production of photon-jets—collimated groupings of photons—in the ATLAS detector at the Large Hadron Collider are reported. Highly collimated photon-jets can arise from the decay of new, highly boosted particles that can decay to multiple photons collimated enough to be identified in the electromagnetic calorimeter as a single, photonlike energy cluster. Data from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 36.7 fb⁻¹, were collected in 2015 and 2016. Candidate photon-jet pair production events are selected from those containing two reconstructed photons using a set of identification criteria much less stringent than that typically used for the selection of photons, with additional criteria applied to provide improved sensitivity to photon-jets. Narrow excesses in the reconstructed diphoton mass spectra are searched for. The observed mass spectra are consistent with the Standard Model background expectation. The results are interpreted in the context of a model containing a new, high-mass scalar particle with narrow width, X, that decays into pairs of photon-jets via new, light particles, α. Upper limits are placed on the cross section times the product of branching ratios σ × ℬ(X → αα) × ℬ(α → γγ)² for 200  GeV < mX < 2  TeV and for ranges of m_α from a lower mass of 100 MeV up to between 2 and 10 GeV, depending upon m_X. Upper limits are also placed on σ × ℬ(X → αα) × ℬ(α → 3π⁰)² for the same range of m_X and for ranges of m_α from a lower mass of 500 MeV up to between 2 and 10 GeV.
dc.description.departmentSchool of Natural Sciences and Mathematics
dc.identifier.bibliographicCitationAaboud, M., G. Aad, B. Abbott, O. Abdinov, et al. 2019. "Search for pairs of highly collimated photon-jets in pp collisions at √s=13 TeV with the ATLAS detector." Physical Review D 99(1): art. 012008, doi: 10.1103/PhysRevD.99.012008
dc.identifier.issn2470-0010
dc.identifier.issue1
dc.identifier.urihttps://dx.doi.org/10.1103/PhysRevD.99.012008
dc.identifier.urihttps://hdl.handle.net/10735.1/8875
dc.identifier.volume99
dc.language.isoen
dc.publisherAmer Physical Soc
dc.rightsCC BY 4.0 (Attribution)
dc.rights©2019 CERN for the ATLAS Collaboration
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.source.journalPhysical Review D
dc.subjectAstronomy
dc.subjectAstrophysics
dc.subjectPhysics
dc.subjectScalar field theory
dc.subjectPhotons
dc.subjectLarge Hadron Collider (France and Switzerland)
dc.subjectProton-proton interactions
dc.subjectStandard model (Nuclear physics)
dc.titleSearch for Pairs of Highly Collimated Photon-Jets in pp Collisions at √s=13 TeV with the ATLAS Detector
dc.type.genrearticle

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Izen, Joseph M.