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A search for pairs of highly collimated photon-jets in pp collisions at √s = 13 TeV with the ATLAS detector

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    0520705 - FZÚ 2020 RIV US eng J - Journal Article
    Aaboud, M. - Aad, G. - Abbott, B. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2913 authors
    A search for pairs of highly collimated photon-jets in pp collisions at √s = 13 TeV with the ATLAS detector.
    Physical Review D. Roč. 99, č. 1 (2019), s. 1-29, č. článku 012008. ISSN 2470-0010. E-ISSN 2470-0029
    R&D Projects: GA MŠk LM2015058
    Institutional support: RVO:68378271
    Keywords : ATLAS * CERN LHC Coll * mass dependence * sensitivity * background * cluster * experimental results * 13000 GeV-cms
    OECD category: Particles and field physics
    Impact factor: 4.833, year: 2019
    Method of publishing: Open access

    Results 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.
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