SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 129: Flavor X

T 129.3: Vortrag

Donnerstag, 23. März 2023, 18:00–18:15, HSZ/0304

Measuring R(D^*) in hadronic one-prong τ decays at Belle II. — Florian Bernlochner, Jochen Dingfelder, Peter Lewis, and •Ilias Tsaklidis for the Belle II collaboration — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn, Nußallee 12, 53115 Bonn, Germany

Over the last years many experiments have hinted at the existence of lepton universality violating processes. In this work we probe these processes by measuring the R(D^*) ratio with hadronically decaying τ leptons. The Belle II experiment produces BB pairs and it greatly benefits from the clean experimental environment of e⁺   e⁻ collisions. In this study we tag one of the two B mesons using the Full Event Interpretation algorithm in fully hadronic modes, in order to kinematically constrain the second B meson. We further reconstruct B → D^* τ ν decays with a single charged hadron originating from the τ decay and two missing neutrinos in the event. This gives us a unique access to other quantities sensitive to New Physics, such as the polarization of the τ lepton in B-meson decays. In this talk the current status of the analysis and the expected sensitivity using 364 fb⁻¹ of Belle II data will be presented.