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Verhandlungen
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DPG

Bonn 2020 – scientific programme

The DPG Spring Meeting in Bonn had to be cancelled! Read more ...

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T: Fachverband Teilchenphysik

T 9: Flavor physics: Lepton universality tests I

T 9.4: Talk

Monday, March 30, 2020, 17:15–17:30, H-HS X

Signal extraction of B0 → π τ+ ντ at Belle and Belle IIJochen Dingfelder, Peter Lewis, and •Lu Xu for the Belle II collaboration — Physikalisches Institut, Universität Bonn, Bonn, Germany

The decay B0 → π τ+ ντ is sensitive to new physics beyond the Standard Model, such as contributions from charged Higgs bosons or leptoquarks. The world’s best limit was established by the Belle experiment using its full dataset, measuring B(B0 → π τ+ ντ) < 2.5 × 10−4 at 90% confidence level. We present the current status of an ongoing measurement of B(B0 → π τ+ ντ) with improved hadronic tagging in leptonic and hadronic τ decay modes. The study aims to extract the ratio R(π) = B(B0 → π τ+ ντ) / B(B0 → π+ ν) with ℓ denoting either an electron or muon. A MVA based on a boosted decision tree is employed to separate light lepton and τ contributions from each other.

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