Observation of electroweak production of two jets in association with an isolated photon and missing transverse momentum, and search for a Higgs boson decaying into invisible particles at 13 TeV with the ATLAS detector
In: European Physical Journal C, 1434-6044, 2022, 82:2; orcid:0000-0003-2127-373x; orcid:0000-0002-1253-8583; orcid:0000-0002-8204-4124; orcid:0000-0002-7341-9115; orcid:0000-0001-5997-3569; orcid:0000-0001-5265-3175; orcid:0000-0003-2887-5311; orcid:0000-0002-6126-7230; orcid:0000-0002-6277-1877; ISI:000751762900004
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Zugriff:
This paper presents a measurement of the electroweak production of two jets in association with a Z gamma pair, with the Z boson decaying into two neutrinos. It also presents a search for invisible or partially invisible decays of a Higgs boson with a mass of 125 GeV produced through vectorboson fusion with a photon in the final state. These results use data from LHC proton-proton collisions at root s = 13 TeV collected with the ATLAS detector and corresponding to an integated luminosity of 139 fb(-1). The event signature, shared by all benchmark processes considered for the measurements and searches, is characterized by a significant amount of unbalanced transverse momentum and a photon in the final state, in addition to a pair of forward jets. Electroweak Z gamma production in association with two jets is observed in this final state with a significance of 5.2 (5.1 expected) standard deviations. The measured fiducial cross-section for this process is 1.31 +/- 0.29 fb. An observed (expected) upper limit of 0.37 (0.34(-0.10)(+0.15)) at 95% confidence level is set on the branching ratio of a 125 GeV Higgs boson to invisible particles, assuming the Standard Model production cross-section. The signature is also interpreted in the context of decays of a Higgs boson into a photon and a dark photon. An observed (expected) 95% CL upper limit on the branching ratio for this decay is set at 0.018 (0.017(-0.005)(+0.007)), assuming the Standard Model production cross-section for a 125 GeV Higgs boson. ; For complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-021-09878-z
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Observation of electroweak production of two jets in association with an isolated photon and missing transverse momentum, and search for a Higgs boson decaying into invisible particles at 13 TeV with the ATLAS detector
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Autor/in / Beteiligte Person: | Aad, G. ; Asimakopoulou, Eleni M. ; Bergeås Kuutmann, Elin ; Brenner, Richard ; Ekelöf, Tord ; Ellajosyula, Venugopal ; Ellert, Mattias ; Ferrari, Arnaud ; Gonzalez Suarez, Rebeca ; Mathisen, Thomas ; Ördek, Serhat ; Sunneborn Gudnadottir, Olga ; Zwalinski, L. |
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Quelle: | European Physical Journal C, 1434-6044, 2022, 82:2; orcid:0000-0003-2127-373x; orcid:0000-0002-1253-8583; orcid:0000-0002-8204-4124; orcid:0000-0002-7341-9115; orcid:0000-0001-5997-3569; orcid:0000-0001-5265-3175; orcid:0000-0003-2887-5311; orcid:0000-0002-6126-7230; orcid:0000-0002-6277-1877; ISI:000751762900004 |
Veröffentlichung: | Uppsala universitet, Högenergifysik ; Uppsala universitet, FREIA ; Aix Marseille Univ, CNRS, IN2P3, CPPM, Marseille, France ; CERN, Geneva, Switzerland ; SPRINGER, 2022 |
Medientyp: | academicJournal |
ISBN: | 978-0-00-751762-6 (print) ; 0-00-751762-9 (print) |
DOI: | 10.1140/epjc/s10052-021-09878-z |
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