Measurement of the branching fractions and time-dependent CP asymmetry at the Belle II experiment

Ming-Chuan Chang^1*

¹Physics, Fu Jen Catholic University, New Taipei, Taiwan

* Presenter:Ming-Chuan Chang, email:068190@mail.fju.edu.tw

The branching fractions of B⁰ decaying into J/ψ π⁰, B⁰ decaying into J/ψ η, B⁰ decaying into D_s0^*+(2317) D^-, B⁰ decaying into D_s1⁺(2460) D^-, and B_s⁰ decaying into K_s⁰ π⁰ have been preliminary measured. Additionally, the time-dependent CP asymmetry of B⁰ decaying into J/ψ π⁰ and B⁰ decaying into J/ψ η has also been determined preliminary.

These measurements were carried out using data collected by the Belle and Belle II experiments, conducted at the Υ(4S) and Υ(5S) resonances at the KEKB and SuperKEKB facilities, which are asymmetric energy e⁺ and e^- colliders. The analysis includes various aspects such as signal event selections, separation of signal and background events, and more, all detailed in the reported findings.

Keywords: branching fraction, time-dependent CP asymmetry, Belle and Belle II experiment