Belle II Collaboration

23 June 2021

Abstract: We present preliminary results on the reconstruction of the \bjpsikl decay, where $\jpsi\to\mumu$ or \epem. Using a dataset corresponding to a luminosity of $62.8\pm0.6\invfb$ collected by the Belle II experiment at the SuperKEKB asymmetric energy \epem collider, we measure a total of $267\pm21$ candidates with $\jpsi\to\mumu$ and $226\pm20$ with with $\jpsi\to\epem$. The quoted errors are statistical only.

Keyword(s): TDCPV ; b->ccs