Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13TeV
dc.contributor.author | Sirunyan, A. M. | pt_BR |
dc.contributor.author | Silveira, Gustavo Gil da | pt_BR |
dc.contributor.author | CMS Collaboration | pt_BR |
dc.date.accessioned | 2019-05-28T02:36:57Z | pt_BR |
dc.date.issued | 2019 | pt_BR |
dc.identifier.issn | 1434-6044 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/194650 | pt_BR |
dc.description.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. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | The European physical journal. C, Particles and fields. Berlin. Vol. 79, no. 2 (Feb. 2019), 94, 27 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Aceleradores de partículas | pt_BR |
dc.subject | Colisões proton-proton | pt_BR |
dc.subject | Bosons de higgs | pt_BR |
dc.subject | Bosons Z | pt_BR |
dc.subject | Mésons psi | pt_BR |
dc.title | Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13TeV | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 001088903 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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