2023/07/17 by Volpe, Roberta, Collaboration, Belle II
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)
paper · doi:10.48550/arxiv.2307.08638
We report on recent results obtained by the Belle II experiment related to searches for beyond-the-standard-model physics. The B meson decay data sample used corresponds to an integrated luminosity of L = 189 fb-1. In recent years, discrepancies from standard-model predictions, which suggest violation of lepton-flavor universality, have emerged in multiple measurements of B-meson decays. In this document two analyses aimed to search for violation of the light-lepton universality are reported: the inclusive R(Xe/μ) measurement and an angular analysis of the B0 → D*- l+ νl, with l=e,μ, decays. In addition, beyond-the-standard-model physics can manifests itself with the production of new particles. The search for a long-lived spin-0 particle in b→ s transitions, and its interpretation in two dark sector models, is reported.