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T: Fachverband Teilchenphysik
T 9: Flavor physics: Lepton universality tests I
T 9.4: Vortrag
Montag, 30. März 2020, 17:15–17:30, H-HS X
Signal extraction of B0 → π− τ+ ντ at Belle and Belle II — Jochen 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− ℓ+ νℓ) 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.