Searches for the exclusive decays of Higgs and Z bosons into a vector quarkonium state and a photon are performed in the μ+μ−γ final state with a proton–proton collision data sample corresponding to an integrated luminosity of 139 fb−1 collected at s√=13 TeV with the ATLAS detector at the CERN Large Hadron Collider. The observed data are compatible with the expected backgrounds. The 95% confidence-level upper limits on the branching fractions of the Higgs boson decays into J/ψγ, ψ(2S)γ, and Υ(1S,2S,3S)γ are found to be 2.0×10−4, 10.5×10−4, and (2.5,4.2,3.4)×10−4, respectively, assuming Standard Model production of the Higgs boson. The corresponding 95% CL upper limits on the branching fractions of the Z boson decays are 1.2×10−6, 2.4×10−6, and (1.1,1.3,2.4)×10−6. An observed 95% CL interval of (−133,175) is obtained for the κc/κγ ratio of Higgs boson coupling modifiers, and a 95% CL interval of (−37,40) is obtained for κb/κγ.

Searches for exclusive Higgs and Z boson decays into a vector quarkonium state and a photon using 139 fb⁻¹ of ATLAS √s=13 TeV proton–proton collision data / G. Aad, B.A.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 83:9(2023 Sep 15), pp. 824.1-824.26. [10.1140/epjc/s10052-023-11869-1]

Searches for exclusive Higgs and Z boson decays into a vector quarkonium state and a photon using 139 fb⁻¹ of ATLAS √s=13 TeV proton–proton collision data

A. Andreazza;A. Carbone;L. Carminati;S. D'Auria;L. Dell'Asta;M. Fanti;M. Lazzaroni;C. Meroni;F. Ragusa;A. Stabile;
2023

Abstract

Searches for the exclusive decays of Higgs and Z bosons into a vector quarkonium state and a photon are performed in the μ+μ−γ final state with a proton–proton collision data sample corresponding to an integrated luminosity of 139 fb−1 collected at s√=13 TeV with the ATLAS detector at the CERN Large Hadron Collider. The observed data are compatible with the expected backgrounds. The 95% confidence-level upper limits on the branching fractions of the Higgs boson decays into J/ψγ, ψ(2S)γ, and Υ(1S,2S,3S)γ are found to be 2.0×10−4, 10.5×10−4, and (2.5,4.2,3.4)×10−4, respectively, assuming Standard Model production of the Higgs boson. The corresponding 95% CL upper limits on the branching fractions of the Z boson decays are 1.2×10−6, 2.4×10−6, and (1.1,1.3,2.4)×10−6. An observed 95% CL interval of (−133,175) is obtained for the κc/κγ ratio of Higgs boson coupling modifiers, and a 95% CL interval of (−37,40) is obtained for κb/κγ.
Settore ING-INF/07 - Misure Elettriche e Elettroniche
Settore FIS/01 - Fisica Sperimentale
15-set-2023
https://link.springer.com/article/10.1140/epjc/s10052-023-11869-1
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1004528
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