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首页> 外文期刊>Physical review, D >Resonances X(4140), X(4160), and Pcs(4459) in the decay of Λb→J/ψΛ?
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Resonances X(4140), X(4160), and Pcs(4459) in the decay of Λb→J/ψΛ?

机译:在λb→j /ψλ的衰减中共振x(4140),x(4160)和PC(4459)?

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We study the decay of Λ b → J / ψ Λ ? by taking into account the intermediate resonances X ( 4140 ) , X ( 4160 ) , and P c s ( 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 * D ˉ s * threshold in the J / ψ ? invariant mass distribution of the Λ b → J / ψ Λ ? process, which can be associated to the D s * D ˉ 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 c s ( 4459 ) with strangeness. We predict an enhancement structure close to the threshold in the D s * D ˉ s * invariant mass distribution of the Λ b → D s * D ˉ s * Λ 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 c s ( 4459 ) .
机译:我们研究了λb→j /ψλ的衰减?通过考虑中间谐振x(4140),x(4160)和pc s(4459)。除了X的峰值(4140)之外,我们还发现了大约4160的凸块结构,然后在j /ψ中围绕d s * dˉs *阈值围绕cusp结构不变的λb→j /∞λ的质量分布?方法,其可以与D S * DˉS *分子状态x(4160)相关联。我们还表明,这种反应也可用于以陌生度确认隐藏魅力Pentaquark P C S(4459)的存在。我们预测λb→d s *dˉs*λ过程的D s * dˉs *不变质量分布中的阈值接近阈值的增强结构,这是x(4160)的反射,不应该是以一种新的共鸣误导。我们强烈建议实验主义者进一步测量这些过程,这对于阐明X(4140)和X(4160)共振的性质可以有用,并确认P C S(4459)的存在。

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