Evidence for B⁰ → pΣ⁰π^- at Belle

2023/05/30 by Belle Collaboration, Chang, C. -Y., Wang, M. -Z. +192
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2305.18821

Abstract

We search for the B⁰→ pΣ⁰π^- decay with Σ⁰ → Λγ, where the γ is not measured, using a data sample corresponding to an integrated luminosity of 711 \rmfb^-1 which contains 772 × 10⁶ BB pairs, collected around the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e^- collider. We measure for the first time the B⁰→ pΣ⁰π^- branching fraction to be B(B⁰ → p Σ⁰ π^-) = (1.17^+0.43_-0.40(stat)± 0.07(syst)) × 10^-6 with a significance of 3.0σ. We simultaneously measure the branching fraction for the related channel B⁰→ pΛπ^- with much improved precision.

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