SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 55: Flavor V, Top-BSM

T 55.2: Vortrag

Mittwoch, 22. März 2023, 16:05–16:20, HSZ/0401

Inclusive analysis of untagged B → X l⁺l⁻ decays at Belle II — •Arul Prakash Sivagurunathan, Sviatoslav Bilokin, and Thomas Kuhr — Ludwig-Maximilians-Universität München

Precision measurements of inclusive B → Xl⁺l⁻ decays can provide invaluable complementary information to scrutinize anomalies observed in their exclusive b → sl⁺l⁻ counterparts. However, limited tagging efficiency, small Standard Model signal and very high background rate make these measurements very challenging, with no results being published so far. In our work, we will assess the chances of a 5σ result with data from the Belle and Belle II experiments. We will apply machine learning algorithms to tackle background rejection. We will finally compute the lepton flavour universality ratio R(X) = B(B → X µ⁺µ⁻) / B(B → X e⁺ e⁻) which, together with R(K) and R(K^*), will be key to constrain potential New Physics contributions.