论文标题
通过保护法搜索$ b_c^\ ast $
Searching $B_c^\ast$ via conservation laws
论文作者
论文摘要
要区分$ b_c^{\ ast +}（1^3S_1）$和$ b_c^ +（1^1s_0）$在实验中，我们根据保护法提出了两种方法。 I.从角动量保护中，$ j/ψ$的非零螺旋性的$ b_c^{（\ ast）+} \至j/ψπ^+$将是$ b_c^{\ ast+} $的证据。 ii。由于$ b_c^+ \ to b^+ ϕ $是禁止的，因此$ b_c^{\ ast+} \ to b^+ ϕ $提供了一个干净的通道，以探测$ b_c^{\ ast+} $ \ \,。特别是，我们的结果表明，$ b_c^{\ ast+} $承诺通过$ b_c^{（\ ast）+} \ to j/ψπ^+$在LHC上观察到。另一方面，我们发现$ {\ cal b}（b_c^{\ ast+} \ to b^+ ϕ）=（7.0 \ pm 3.0）\ times 10^{ - 9} $，在HL-LHC和FCC-HH的即将实验的实验中也可以进行测量。
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.
