The B K decays proceed via b → s sbar s loop transitions. Such flavor-changing-neutral-current transitions are highly suppressed in the standard model and provide an excellent opportunity to search for new physics. We report the measurement of the branching fraction and CP asymmetries in B →ffK decays based on a 711 fb-1 data sample containing 772 106BB events collected at the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e-collider. In the second part of the talk, we discuss a particle identification (PID) framework developed for charged hadrons (pions, kaons and protons) based on energy loss information in the silicon-strip vertex detector (SVD). The study is based on e+e- collision data recorded by the Belle II detector and the results are compared with that of a simulated sample. The introduction of SVD information is found to improve the overall PID performance in the low-momentum region.
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