Contribution to a conference proceedings/Contribution to a book

PUBDB-2026-01133

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Measurements of lepton-flavour universality in semileptonic $B$ decay at Belle II

Mantovano, M.Extern*DESY*

2026
Sissa Medialab Trieste, Italy

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Please use a persistent id in citations: doi:10.22323/1.485.0317

Abstract: The first run of the Belle II experiment collected a 365 fb−1 sample of collisions at a centre-of-mass energy corresponding to the Υ(4S) resonance. These data, characterised by low particle multiplicity, well-constrained initial-state kinematics, and excellent lepton identification, provide an ideal environment to study lepton-flavour universality in semileptonic B decays. We present results on the ratios of semitauonic decay rates compared to those to light leptons in both exclusive and inclusive B decay. These include new measurements of the ratios for exclusive B→D(∗)ℓνℓ decays R(D(∗))τ/ℓ in events tagged by a semileptonic B decay.

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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

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