Search for Higgs boson decays into two neutral scalars with unequal masses in final states with b quarks and tau leptons in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

A search for Higgs boson (H) decays into a pair of neutral scalars $ϕ_1$ and $ϕ_2$, with $ϕ_2$ heavier than $ϕ_1$, is performed in final states with b quarks and tau leptons. Depending on the masses of the neutral scalars, $ϕ_2$ can undergo a cascade decay into $ϕ_1ϕ_1$. For both the cascade and non-cascade scenarios, one $ϕ_1$ is required to decay to a pair of tau leptons. Proton-proton collision data corresponding to an integrated luminosity of 138 fb$^{-1}$ collected with the CMS detector at the LHC at $\sqrt{s}$ = 13 TeV are analyzed. No statistically significant excess over the standard model expectation is observed. Upper limits are set on the products $σ\mathcal{B}$(H $\to$ $ϕ_1ϕ_2$ $\to$ 3$ϕ_1$ $\to$ 2$τ$4b) and $σ\mathcal{B}$(H $\to$ $ϕ_1ϕ_2$) $\mathcal{B}$($ϕ_1$ $\to$ 2$τ$) $\mathcal{B}$($ϕ_2$ $\to$ 2b) where $σ$ is the Higgs boson production cross section. The observed upper limits range between 0.9 and 36.8 pb at 95% confidence level, depending on the mass hypothesis and decay scenario.