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dc.contributor.authorAaboud, Morad
dc.contributor.authorAad, Georges
dc.contributor.authorAbbott, Brad
dc.contributor.authorAbdinov, Ovsat Bahram oglu
dc.contributor.authorAbeloos, Baptiste
dc.contributor.authorAbhayasinghe, Deshan Kavishka
dc.contributor.authorAbidi, Syed Haider
dc.contributor.authorAbouZeid, Hass
dc.contributor.authorAbraham, Nadine L.
dc.contributor.authorAbramowicz, Halina
dc.contributor.authorBuanes, Trygve
dc.contributor.authorDjuvsland, Julia Isabell
dc.contributor.authorEigen, Gerald
dc.contributor.authorFomin, Nikolai
dc.contributor.authorLipniacka, Anna
dc.contributor.authorMartin dit Latour, Bertrand
dc.contributor.authorMæland, Steffen
dc.contributor.authorStugu, Bjarne
dc.contributor.authorYang, Zongchang
dc.contributor.authorZalieckas, Justas
dc.contributor.authorBugge, Magnar Kopangen
dc.contributor.authorCameron, David Gordon
dc.contributor.authorCatmore, James Richard
dc.contributor.authorFeigl, Simon
dc.contributor.authorFranconi, Laura
dc.contributor.authorGaronne, Vincent
dc.contributor.authorGramstad, Eirik
dc.contributor.authorHellesund, Simen
dc.contributor.authorMorisbak, Vanja
dc.contributor.authorOppen, Henrik
dc.contributor.authorOuld-Saada, Farid
dc.contributor.authorPedersen, Maiken
dc.contributor.authorRead, Alexander Lincoln
dc.contributor.authorRøhne, Ole Myren
dc.contributor.authorSandaker, Heidi
dc.contributor.authorSerfon, Cédric
dc.contributor.authorStapnes, Steinar
dc.contributor.authorVadla, Knut Oddvar Høie
dc.contributor.authorAbreu, Henso
dc.contributor.authorAbulaiti, Yiming
dc.contributor.authorAcharya, Bobby S.
dc.contributor.authorAdachi, Shunsuke
dc.contributor.authorAdamczyk, Leszek
dc.contributor.authorAdelman, Jareed
dc.contributor.authorAdersberger, Michael
dc.contributor.authorAdigüzel, Aytül
dc.contributor.authorAdye, Tim
dc.contributor.authorAffolder, Anthony Allen
dc.contributor.authorAfik, Yoav
dc.contributor.authorAgheorghiesei, Catalin
dc.contributor.authorATLAS, Collaboration
dc.date.accessioned2020-06-26T12:18:39Z
dc.date.available2020-06-26T12:18:39Z
dc.date.issued2019-01-18
dc.PublishedAaboud M, Aad G, Abbott B, Abdinov OBo, Abeloos B, et al., ATLAS C. Search for pairs of highly collimated photon-jets in pp collisions at √s=13 TeV with the ATLAS detector. Physical Review D. 2019;99(1):012008eng
dc.identifier.issn2470-0010en_US
dc.identifier.issn2470-0029en_US
dc.identifier.urihttps://hdl.handle.net/1956/23056
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, a. Upper limits are placed on the cross section times the product of branching ratios σ×B(X→aa)×B(a→γγ)^2 for 200  GeV<m_X<2  TeV and for ranges of m_a 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→aa)×B(a→3π^0)^2 for the same range of m_X and for ranges of m_a from a lower mass of 500 MeV up to between 2 and 10 GeV.en_US
dc.language.isoengeng
dc.publisherAmerican Physical Societyen_US
dc.rightsAttribution CC BYeng
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/eng
dc.titleSearch for pairs of highly collimated photon-jets in pp collisions at √s=13 TeV with the ATLAS detectoren_US
dc.typePeer reviewed
dc.typeJournal article
dc.date.updated2019-11-08T11:38:45Z
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2019 CERN, for the ATLAS Collaborationen_US
dc.identifier.doihttps://doi.org/10.1103/physrevd.99.012008
dc.identifier.cristin1689425
dc.source.journalPhysical Review D
dc.subject.nsiVDP::Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431
dc.subject.nsiVDP::Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431


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