Three rare decay processes of the Higgs boson to a ρ (770)0, ϕ(1020), or K∗(892)0 me- son and a photon are searched for using √s = 13 TeV proton-proton collision data col- lected 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 trigger- ing and reconstruction techniques are adopted. The analyzed data sets correspond to integrated luminosities up to 138 fb−1, depending on the reconstructed final state. Af- ter combining various data sets and categories, no significant excess above the back- ground expectations is observed. Upper limits at 95% confidence level on the Higgs boson branching fractions into ρ (770)0γ, ϕ(1020)γ, and K∗(892)0γ are determined to be 3.7 × 10−4, 3.0 × 10−4, and 3.0 × 10−4, respectively. In case of the ρ (770)0γ and ϕ(1020)γ channels, these are the most stringent experimental limits to date.

Search for the Higgs boson decays to a ρ0, ϕ, or K∗0 meson and a photon in proton-proton collisions at √s = 13 TeV

Cavallo, N.;Fabozzi, F.;
2025-01-01

Abstract

Three rare decay processes of the Higgs boson to a ρ (770)0, ϕ(1020), or K∗(892)0 me- son and a photon are searched for using √s = 13 TeV proton-proton collision data col- lected 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 trigger- ing and reconstruction techniques are adopted. The analyzed data sets correspond to integrated luminosities up to 138 fb−1, depending on the reconstructed final state. Af- ter combining various data sets and categories, no significant excess above the back- ground expectations is observed. Upper limits at 95% confidence level on the Higgs boson branching fractions into ρ (770)0γ, ϕ(1020)γ, and K∗(892)0γ are determined to be 3.7 × 10−4, 3.0 × 10−4, and 3.0 × 10−4, respectively. In case of the ρ (770)0γ and ϕ(1020)γ channels, these are the most stringent experimental limits to date.
2025
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/201908
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