Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 30: Flavour Physics 3

T 30.2: Talk

Tuesday, March 22, 2022, 16:30–16:45, T-H15

Inclusive analysis of untagged B → X l⁺ l⁻ decays at Belle II — •Sviatoslav Bilokin and Thomas Kuhr — Geschwister-Scholl-Platz 1, Munchen, Germany

The b → s (d) l⁺ l⁻ processes are sensitive to New Physics phenomena since these decays may only occur through loops in the Standard Model.

This contribution describes a study of b → s (d) l⁺ l⁻ decays at the Belle II experiment using a fully-inclusive approach, where we have no explicit restrictions on the quark hadron final states. So far, no results of fully inclusive b → s (d) l⁺ l⁻ studies have been published because of the small signal branching ratio in the Standard Model, limited efficiency of the established tagging methods, and high rate of background processes.

This analysis intends to use machine learning techniques to reject background processes and an unrestricted tag side to measure R(X) = B(B → X µ⁺ µ⁻) / B(B → X e⁺ e⁻) as a lepton universality test, similarly to R(K) and R(K^*) measurements, which are known for their deviations from the Standard Model predictions.