Cheolhun Kim

20 April 2023
Spring KPS (The Korean Physical Society)

Abstract: We aim to search for the rare decay 𝑩𝟎 → 𝝉"𝝉# at the Belle II experiment using the superKEKB asymmetric electron-positron collider. While the standard model predicts the decay mode to have a low branching fraction, various extensions of the model expect enhancements. The results will be obtained with data samples corresponding to an integrated luminosity of 363 fb-1 collected at the 𝚼(𝟒𝑺) resonance. We use a hadronic tagging method that reconstructs fully accompanying B mesons and attempts to identify signals from the remaining part of the event. The result of this study will be the measurement or upper limit setting of the branching fraction of the decay. We present the results based on Monte Carlo simulation samples.

Keyword(s): Leptonic ; FEI