Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 3: Flavour Physics 1

T 3.2: Vortrag

Montag, 21. März 2022, 16:30–16:45, T-H16

Inclusive B-meson tagging for an R(D^(*)) measurement at Belle II — Thomas Kuhr, Thomas Lück, and •Sofia Palacios Schweitzer — Ludwig-Maximilians-Universität, München

The world average of previous measurements of R(D^(*)), defined as R(D^(*)) = B(B → D^(*) τ ν_τ)/B(B → D^(*) l ν_l), shows a 3.4σ deviation from Standard Model predictions, which could indicate some new physics phenomena, such as the existence of Leptoquarks. This analysis uses data and simulations from the Belle II experiment at the SuperKEKB electron-positron collider to measure R(D^(*)). To account for the challenge of multiple neutrinos as final state particles, an approach is considered, where besides the signal B-meson decay kinematical and topological properties of the other B-meson are reconstructed fully inclusively. In contrast to exclusive tagging used for previous measurements of R(D^(*)) by the B-factories, this inclusive tagging approach suffers from a larger background, but also offers a higher reconstruction efficiency. The current status of the analysis will be presented.