Observation of B⁰ →ψ(2S)K⁰_Sπ⁺π⁻ and B⁰_s→ψ(2S)K⁰_S decays

Authors

A. Tumasyan, CMS Collaboration

Date of this Version

4-8-2022

Citation

Eur. Phys. J. C (2022) 82:499. https://doi.org/10.1140/epjc/s10052-022-10315-y

Comments

Open Access.

Abstract

Using a data sample of √ s = 13 TeV proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of 103 fb⁻¹, the B⁰_s → ψ(2S)K⁰_S and B⁰ → ψ(2S)K⁰_Sπ ⁺ π ⁻ decays are observed with significances exceeding 5 standard deviations. The resulting branching fraction ratios, measured for the first time, correspond to B(B⁰_s → ψ(2S)K⁰_S)/B(B⁰ → ψ(2S)K⁰_S) = (3.33 ± 0.69(stat) ± 0.11 (syst) ± 0.34 ( ƒ_s/ ƒ_d)) × 10⁻² and B(B⁰ → ψ(2S)K⁰_Sπ ⁺ π ⁻ )/B(B⁰ → ψ(2S)K⁰_S) = 0.480 ± 0.013 (stat) ± 0.032 (syst), where the last uncertainty in the first ratio is related to the uncertainty in the ratio of production cross sections of B⁰_s and B⁰ mesons, ƒ_s/ ƒ_d.