Recent BelleII results on BSM physics

Sumitted to PubDB: 2023-07-17

Category: Proceeding, Visibility: Public

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Authors	Roberta Volpe
Date	July 8, 2023
Belle II Number	BELLE2-CONF-PROC-2023-019
Abstract	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 $R(X_{e/\mu})$ measurement and an angular analysis of the $B^0 \to D^{*-} l^+ \nu_l$, with $l=e,\mu$, decays. New physics can manifests itself also with the production of new particles. The search for a long-lived spin-0 particle in $b\to s$ transitions, and its interpretation in two dark sector models, is reported as well.