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Searching $B_c^\ast$ via conservation laws

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 $J/ψ$ of $B_c^{(\ast)+ } \to J/ψπ^+$ would be an evidence of $B_c^{\ast +}$. II. Since $B_c^+ \to B^+ ϕ$ is kinematically forbidden, $ B_c^{\ast +} \to B^+ ϕ$ 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 $B_c^{(\ast)+} \to J/ψπ^+$. On the other hand, we find that ${\cal B} ( B_c^{\ast+} \to B^+ ϕ) = ( 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.