Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 30: Flavor physics: Lepton universality tests II

T 30.6: Talk

Tuesday, March 31, 2020, 18:15–18:30, H-HS XIII

Search for B⁺ → K⁺ ν ν at Belle and Belle II. — •Filippo Dattola for the Belle II collaboration — DESY, Hamburg, Germany

We present the status of our analysis on the rare exclusive decay B⁺ → K⁺ ν ν, performed on the full Belle dataset and on the Belle II data so far collected.
Prohibited at the tree level in the Standard Model, and suffering only from hadronic form factors uncertainties, the channel is theoretically clean, and stands as an optimal probe to test possible contributions of new mediators.
The specific conditions of the experiment, such as a clean environment and a well defined initial state, strongly support the search for such decay with missing energy in its final state. Previous experimental studies by Belle and BaBar, both adopting a specific tagging for the accompanying B meson, did not led to signal evidence but only managed to put upper limits on the branching fraction. In our analysis, we use an alternative technique based on inclusive tagging aimed at improving what achieved so far.