Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at √s = 13 TeV
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 observe...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Springer Nature
2019
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/71633/ http://irep.iium.edu.my/71633/ http://irep.iium.edu.my/71633/ http://irep.iium.edu.my/71633/1/71633_Search%20for%20rare%20decays%20of%20Z%20and%20Higgs_article.pdf http://irep.iium.edu.my/71633/2/71633_Search%20for%20rare%20decays%20of%20Z%20and%20Higgs_scopus.pdf http://irep.iium.edu.my/71633/3/71633_Search%20for%20rare%20decays%20of%20Z%20and%20Higgs_wos.pdf |
| Summary: | 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. |
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