Transitions of $B_c\to \psi (1S,2S)$ and the modified harmonic oscillator wave function in LFQM

Hong-Wei Ke, Tan Liu, Xue-Qian Li

The LHC${}_b$ collaboration has systematically measured the rates of $B_c\to J/\psi K$, $B_c\to J/\psi D_s$, $B_c\to J/\psi D_s^{\ast }$ and $B_c\to \psi (2S)\pi$. The new data enable us to study relevant…