Searches for the rare hadronic decays B⁰ → pppp and B⁰_s → pppp

2022/11/16 by LHCb Collaboration
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2211.08847

Abstract

Searches for the rare hadronic decays B⁰ → pppp and B⁰_s → pppp are performed using proton-proton collision data recorded by the LHCb experiment and corresponding to an integrated luminosity of 9\rmfb^-1. Significances of 9.3 σ and 4.0 σ, including statistical and systematic uncertainties, are obtained for the B⁰ → pppp and B⁰_s → pppp signals, respectively. The branching fractions are measured relative to the topologically similar normalisation decays B⁰ → J/ψ(→ pp) K^*0(→ K⁺ π^-) and B⁰_s → J/ψ(→ pp) ϕ(→ K⁺ K^-). The branching fractions are measured to be B(B⁰ → pppp) = ( 2.2 ± 0.4 ± 0.1 ± 0.1 ) × 10^-8 and B(B⁰_s → pppp) = ( 2.3 ± 1.0 ± 0.2 ± 0.1 ) × 10^-8. In these measurements, the first uncertainty is statistical, the second is systematic and the third one is due to the external branching fraction of the normalisation channel.

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