Proceedings

PUBDB-2023-07361

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Recent Belle II results related to 𝑩 anomalies

Fan, Y. (Corresponding author)DESY*

2023
Proceedings of Science

Abstract: Semileptonic 𝐵-meson decays involving the quark transition 𝑏 → 𝑐𝑙𝜈 provide excellent sensi-tivity to probe potential lepton-flavour universality violation. This work introduces two recentmeasurements related to tests of light-lepton flavour universality using a data sample collected atthe Υ(4𝑆) resonance on the Belle II experiment corresponding to an integrated luminosity of 189fb−1. Measurement of the ratio of the branching fractions of inclusive 𝐵 → 𝑋𝑒𝜈𝑒 and 𝐵 → 𝑋 𝜇𝜈𝜇decays and measurement of angular asymmetries of 𝐵0 → 𝐷∗− 𝑙𝜈 decays agree well with standardmodel expectation.

---

Contributing Institute(s):

1. BELLE II Experiment (BELLE)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. KEK: BELLE I/II

Appears in the scientific report 2023

---