Search for rare decays of Z and Higgs bosons to J/ψJ/ψ and a photon in proton-proton collisions at √s = 13TeV
| Parent link: | European Physical Journal C Vol. 79, iss. 2.— 2019.— [94, 27 p.] |
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| Corporate Author: | |
| Other Authors: | , , , , |
| Summary: | Title screen A search is presented for decays of ZZ and Higgs bosons to a J/ψJ/ψ meson and a photon, with the subsequent decay of the J/ψJ/ψ to μ+μ−μ+μ−. The analysis uses data from proton-proton collisions with an integrated luminosity of 35.9fb−1fb−1 at s√=13TeVs=13TeV collected with the CMS detector at the LHC. The observed limit on the Z→J/ψγZ→J/ψγ decay branching fraction, assuming that the J/ψJ/ψ meson is produced unpolarized, is 1.4×10−61.4×10−6 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 −13.6−13.6 to +8.6%+8.6% with respect to the unpolarized scenario. The observed upper limit on the branching fraction for H→J/ψγH→J/ψγ where the J/ψJ/ψ meson is assumed to be transversely polarized is 7.6×10−47.6×10−4, 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√=8TeVs=8TeV to produce an observed upper limit on the branching fraction for H→J/ψγH→J/ψγ that is a factor of 220 larger than the standard model value. |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://doi.org/10.1140/epjc/s10052-019-6562-5 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=662133 |
| Summary: | Title screen A search is presented for decays of ZZ and Higgs bosons to a J/ψJ/ψ meson and a photon, with the subsequent decay of the J/ψJ/ψ to μ+μ−μ+μ−. The analysis uses data from proton-proton collisions with an integrated luminosity of 35.9fb−1fb−1 at s√=13TeVs=13TeV collected with the CMS detector at the LHC. The observed limit on the Z→J/ψγZ→J/ψγ decay branching fraction, assuming that the J/ψJ/ψ meson is produced unpolarized, is 1.4×10−61.4×10−6 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 −13.6−13.6 to +8.6%+8.6% with respect to the unpolarized scenario. The observed upper limit on the branching fraction for H→J/ψγH→J/ψγ where the J/ψJ/ψ meson is assumed to be transversely polarized is 7.6×10−47.6×10−4, 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√=8TeVs=8TeV to produce an observed upper limit on the branching fraction for H→J/ψγH→J/ψγ that is a factor of 220 larger than the standard model value. |
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| DOI: | 10.1140/epjc/s10052-019-6562-5 |