Kazuki Kojima ; Toru Iijima ; Qi-Dong Zhou ; Kodai Matsuoka ; Taichiro Koga ; Katsuro Nakamura ; Koji Hara ; for the Belle II Collaboration

22 March 2023
The 2023 Spring Meeting of the Physical Society of Japan

Abstract: In the semileptonic decay of 𝐵 mesons, the global average of $R(D^{*})$ measurement deviates from the Standard Model by more than $3\sigma$. It indicates a violation of the lepton universality. We will measure $R(D^{*})$ for the validation of this deviation using the Belle II data. We have developed an analysis method employing the hadronic tag algorithm. In this talk, we report the results of the $R(D^{*})$ measurement using $189~\mathrm{fb}^{-1}$ data collected by the summer of 2021.

Keyword(s): R(D*) ; D*taunu ; FEI ; Hadronic tag ; Leptonic tau decay ; Semileptonic ; Semitauonic ; JPS ; JPS2023 ; JPS2023Spring
Note: 20 minutes (15 minutes presentation + 5 minutes Q&A); https://www.jps.or.jp/activities/meetings/past.php; https://kds.kek.jp/event/45609/