Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 102: Flavour physics 4

T 102.7: Talk

Thursday, March 7, 2024, 17:30–17:45, Geb. 30.41: HS 4

Improving R(D^(*)) with hadronic FEI and leptonic tau decays with Belle II Run 1 data. — •Agrim Aggarwal, Florian Bernlochner, Jochen Dingfelder, and Markus Prim — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn

In the Standard Model (SM) of particle physics, the W boson couples identically to the three lepton flavors. This concept is known as Lepton Flavor Universality (LFU). In extensions of the SM, additional particles, which couple to the b−c−τ−ν_τ vertex, are able to modify the coupling to the three lepton flavors. At Belle II, this can be studied using B → D^(*)τ ν_τ decays and by probing ratios of the form R(D^*) = B(B → D^(*) τ ν_τ) / B(B → D^(*) ℓ ν_ℓ). We present the current status of an improved analysis strategy to determine R(D^*) using 364 fb⁻¹ of integrated luminosity of Run 1 collision data of the Belle II experiment.