Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 3: Flavour Physics 1

T 3.4: Vortrag

Montag, 21. März 2022, 17:00–17:15, T-H16

Measuring R(D^*) in hadronic one-prong τ decays at Belle II — Florian Bernlochner, William Sutcliffe, and •Ilias Tsaklidis for the Belle II collaboration — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn

In this work we are measuring the R(D^*) ratio with hadronically decaying τ leptons. The Belle II experiment is producing exact 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 reconstruct B → D^* τ ν decays with a single charged track originating from the τ decay and two missing neutrinos. This gives us a unique access to quantities, sensitive to New Physics, such as the τ lepton polarization besides the R(D^*) ratio. In this talk the reconstruction strategy, the current status and future targets of the analysis will be presented.