Measurement of the branching fraction and time-dependent CP asymmetry in B⁰→J/ψ η decays at Belle-II experiment

Ming-Chuan Chang^1*, Yan-Yu Chen¹

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

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

The branching fraction and time-dependent CP asymmetry of B⁰→J/ψ η was measured. We study the CP asymmetry parameters S and A by performing an unbinned maximum likelihood fit to the ∆t distribution. In this study, the event selections and the results of reconstructed B mesons will be presented.

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