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Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at s√ = 13 TeV

Sirunyan, AM (2019) Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at s√ = 13 TeV. In: EUROPEAN PHYSICAL JOURNAL C .

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Official URL: https://doi.org/10.1140/epjc/s10052-019-6562-5

Abstract

Abstract A search is presented for decays of Z and Higgs bosons to a J/ψ meson and a photon, with the subsequent decay of the J/ψ to μ+μ−. The analysis uses data from proton-proton collisions with an integrated luminosity of 35.9 fb−1 at √s = 13 TeV collected with the CMS detector at the LHC. The observed limit on the Z → J/ψγ decay branching fraction, assuming that the J/ψ meson is produced unpolarized, is 1.4 × 10−6 at 95% confidence level, which corresponds to a rate higher than expected in the standard model by a factor of 15. For extreme-polarization scenarios, the observed limit changes from −13.6 to +8.6% with respect to the unpolarized scenario. The observed upper limit on the branching fraction for H → J/ψγ where the J/ψ meson is assumed to be transversely polarized is 7.6×10−4, a factor of 260 larger than the standard model prediction. The results for the Higgs boson are combined with previous data from proton-proton collisions at √s = 8 TeV to produce an observed upper limit on the branching fraction for H → J/ψγ that is a factor of 220 larger than the standard model value.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to SPRINGER
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Depositing User: Id for Latest eprints
Date Deposited: 20 Feb 2019 05:03
Last Modified: 20 Feb 2019 05:03
URI: http://eprints.iisc.ac.in/id/eprint/61793

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