论文标题
共鸣$ x（4140）$，$ x（4160）$和$ p_ {cs}（4459）$ $λ_b\ to J/ψλϕ $中的衰减中的$
The resonances $X(4140)$, $X(4160)$, and $P_{cs}(4459)$ in the decay of $Λ_b\to J/ψΛϕ$
论文作者
论文摘要
我们通过考虑中间共振$ x（4140）$，$ x（4160）$和$ p_ {cs}（4459）$来研究$λ_b\ \ to j/ψλ钱的衰减。除了$ x（4140）$的高峰外，我们还发现了一个大约4160 meV的颠簸结构，然后在$ d^*_ s \ bar {d}^*_ s $ threshold $ d^*_ s \ bar { $ d^*_ s \ bar {d}^*_ s $分子状态$ x（4160）$。我们还表明，该反应也可以用来确认隐藏的charm pentaquark $ p_ {cs}（4459）$ at nemplentes的存在。我们预测一个增强结构接近$ d^*_ s \ bar {d}^*_ s $不变的质量分布的$λ_b\ to d^*_ s \ bar {d}^*_sλ$过程，这是$ x（4160）$的反射，并且不应被误解为新的resonson，我们强烈建议实验者进一步衡量这些过程，这对于阐明$ x（4140）$和$ x（4160）$共振的性质可能很有用，并确认存在$ p_ {cs}（4459）$。
We study the decay of $Λ_b\to J/ψΛϕ$ by taking into account the intermediate resonances $X(4140)$, $X(4160)$, and $P_{cs}(4459)$. In addition to the peak of the $X(4140)$, we also find a bump structure around 4160 MeV followed by a cusp structure around $D^*_s\bar{D}^*_s$ threshold in the $J/ψϕ$ invariant mass distribution of the $Λ_b\to J/ψΛϕ$ process, which can be associated to the $D^*_s\bar{D}^*_s$ molecular state $X(4160)$. We also show that this reaction can also be used to confirm the existence of the hidden-charm pentaquark $P_{cs}(4459)$ with strangeness. We predict an enhancement structure close to the threshold in the $D^*_s\bar{D}^*_s$ invariant mass distribution of the $Λ_b\to D^*_s\bar{D}^*_sΛ$ process, which is the reflection of the $X(4160)$ and should not be misidentified with a new resonance. We strongly suggest experimentalists to further measure these processes, which can be useful to clarify the nature of $X(4140)$ and $X(4160)$ resonances, and to confirm the existence of the $P_{cs}(4459)$.
