Search for rare decays of the Z and Higgs bosons to a J<math altimg="si1.svg"><mo stretchy="false">/</mo><mspace width="-1.00pt"/><mi mathvariant="normal">ψ</mi></math> or ψ(2S) meson and a photon in proton-proton collisions at <math altimg="si2.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn><mspace width="0.2em"/><mtext>TeV</mtext></math>

Benecke, Anna;Bethani, Agni;Bruno, Giacomo;Caputo, Claudio;CMS;et.al.
(2025) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 865 (2025)

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Abstract
A search is presented for rare decays of the Image 1 and Higgs bosons to a photon and a Image 2 or a Image 3 meson, with the charmonium state subsequentially decaying to a pair of muons. The data set corresponds to an integrated luminosity of 123<math altimg="si3.svg"><mspace width="0.2em"/><msup><mrow><mtext>fb</mtext></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>1</mn></mrow></msup></math> of proton-proton collisions at a center-of-mass energy of 13 TeV collected with the CMS detector at the LHC. No evidence for branching fractions of these rare decay channels larger than predicted in the standard model is observed. Upper limits at 95% confidence level are set: Image 4, Image 5, Image 6, and Image 7. The ratio of the Higgs boson coupling modifiers Image 8 is constrained to be in the interval <math altimg="si4.svg"><mo stretchy="false">(</mo><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>157</mn><mo>,</mo><mspace width="0.2em"/><mo linebreak="badbreak" linebreakstyle="after">+</mo><mn>199</mn><mo stretchy="false">)</mo></math> at 95% confidence level. Assuming Image 9, this interval becomes <math altimg="si5.svg"><mo stretchy="false">(</mo><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>166</mn><mo>,</mo><mspace width="0.2em"/><mo linebreak="badbreak" linebreakstyle="after">+</mo><mn>208</mn><mo stretchy="false">)</mo></math>.
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Benecke, A., Bethani, A., Bruno, G., Caputo, C., de Favereau de Jeneret, J., Delaere, C., Donertas, I. S., Giammanco, A., Guzel, A. O., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Tran, T. T., Wertz, S., CMS, & et al. (2025). Search for rare decays of the Z and Higgs bosons to a J<math altimg=“si1.svg”><mo stretchy=“false”>/</mo><mspace width=”-1.00pt”/><mi mathvariant=“normal”>ψ</mi></math> or ψ(2S) meson and a photon in proton-proton collisions at <math altimg=“si2.svg”><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak=“goodbreak” linebreakstyle=“after”>=</mo><mn>13</mn><mspace width=“0.2em”/><mtext>TeV</mtext></math>. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 865. https://doi.org/10.1016/j.physletb.2025.139462 (Original work published 2025)