  To distinguish $B_c^{\ast +}(1^3S_1)$ and $B_c^+(1^1S_0)$ in the experiments,
we propose two methods based on the conservation laws. I. From the angular
momentum conservation, a nonzero helicity of $J/\psi$ of $B_c^{(\ast)+ } \to
J/\psi \pi^+$ would be an evidence of $B_c^{\ast +}$. II. Since $B_c^+ \to B^+
\phi$ is kinematically forbidden, $ B_c^{\ast +} \to B^+ \phi$ provides a clean
channel to probe $B_c^{\ast +}$\,. Particularly, our results show that
$B_c^{\ast +}$ is promising to be observed at LHC via $B_c^{(\ast)+} \to J/\psi
\pi^+$. On the other hand, we find that ${\cal B} ( B_c^{\ast+} \to B^+ \phi) =
( 7.0 \pm 3.0 ) \times 10 ^{-9} $, which is also feasible to be measured at the
forthcoming experiments at HL-LHC and FCC-hh.
