Search for the Higgs boson decays to a ρ0, ϕ, or K⁎0 meson and a photon in proton-proton collisions at <math altimg="si1.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. 862 (2025)

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Abstract
Three rare decay processes of the Higgs boson to a <math altimg="si2.svg"><mi mathvariant="normal">ρ</mi><msup><mrow><mo stretchy="false">(</mo><mn>770</mn><mo stretchy="false">)</mo></mrow><mrow><mn>0</mn></mrow></msup></math>, <math altimg="si3.svg"><mi mathvariant="normal">ϕ</mi><mo stretchy="false">(</mo><mn>1020</mn><mo stretchy="false">)</mo></math>, or <math altimg="si19.svg"><msup><mrow><mi mathvariant="normal">K</mi></mrow><mrow><mo>⁎</mo></mrow></msup><msup><mrow><mo stretchy="false">(</mo><mn>892</mn><mo stretchy="false">)</mo></mrow><mrow><mn>0</mn></mrow></msup></math> meson and a photon are searched for using <math altimg="si1.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> proton-proton collision data collected by the CMS experiment at the LHC. Events are selected assuming the mesons decay into a pair of charged pions, a pair of charged kaons, or a charged kaon and pion, respectively. Depending on the Higgs boson production mode, different triggering and reconstruction techniques are adopted. The analyzed data sets correspond to integrated luminosities up to 138<math altimg="si5.svg"><mspace width="0.2em"/><msup><mrow><mtext>fb</mtext></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>1</mn></mrow></msup></math>, depending on the reconstructed final state. After combining various data sets and categories, no significant excess above the background expectations is observed. Upper limits at 95% confidence level on the Higgs boson branching fractions into <math altimg="si6.svg"><mi mathvariant="normal">ρ</mi><msup><mrow><mo stretchy="false">(</mo><mn>770</mn><mo stretchy="false">)</mo></mrow><mrow><mn>0</mn></mrow></msup><mi mathvariant="normal">γ</mi></math>, <math altimg="si186.svg"><mi mathvariant="normal">ϕ</mi><mo stretchy="false">(</mo><mn>1020</mn><mo stretchy="false">)</mo><mi mathvariant="normal">γ</mi></math>, and <math altimg="si184.svg"><msup><mrow><mi mathvariant="normal">K</mi></mrow><mrow><mo>⁎</mo></mrow></msup><msup><mrow><mo stretchy="false">(</mo><mn>892</mn><mo stretchy="false">)</mo></mrow><mrow><mn>0</mn></mrow></msup><mi mathvariant="normal">γ</mi></math> are determined to be <math altimg="si9.svg"><mn>3.7</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>4</mn></mrow></msup></math>, <math altimg="si10.svg"><mn>3.0</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>4</mn></mrow></msup></math>, and <math altimg="si10.svg"><mn>3.0</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>4</mn></mrow></msup></math>, respectively. In case of the <math altimg="si6.svg"><mi mathvariant="normal">ρ</mi><msup><mrow><mo stretchy="false">(</mo><mn>770</mn><mo stretchy="false">)</mo></mrow><mrow><mn>0</mn></mrow></msup><mi mathvariant="normal">γ</mi></math> and <math altimg="si186.svg"><mi mathvariant="normal">ϕ</mi><mo stretchy="false">(</mo><mn>1020</mn><mo stretchy="false">)</mo><mi mathvariant="normal">γ</mi></math> channels, these are the most stringent experimental limits to date.
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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 the Higgs boson decays to a ρ0, ϕ, or K⁎0 meson and a photon in proton-proton collisions at <math altimg=“si1.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, 862. https://doi.org/10.1016/j.physletb.2025.139296 (Original work published 2025)