论文标题
带有各种风味含量的roper状共振及其两杆子排放衰变
Roper-like resonances with various flavor contents and their two-pion emission decays
论文作者
论文摘要
我们研究了LHCB的新观察到的底部Baryon $λ_b^*（6072）$的三体衰变； $λ_b^*（6072）\toλ_bππ$。它的质量高于基态$λ_b$的500 meV，并且宽宽度意味着该状态可能是nucleon $ n（1440）$的roper共振的类似物。就经过$σ_b$和$σ_b^*$的顺序过程而言，我们发现观察到的不变质量分布将在其旋转和奇偶校验$ j^p = 1/2^+$的情况下重现。我们讨论了两个顺序过程的比率和两个PION的角相关性对于确定自旋和平等性很有用。我们建议对各种风味含量的Roper共振类似物进行进一步的研究，从而在Baryon光谱中提出了一个有趣而重要的问题。
We study the three-body decay of the newly observed bottom baryon $Λ_b^*(6072)$ by LHCb; $Λ_b^*(6072) \to Λ_b ππ$. Its mass about 500 MeV above the ground state $Λ_b$ and a broad width imply that the state could be an analogue of the Roper resonance of the nucleon $N(1440)$. In terms of sequential processes going through $Σ_b$ and $Σ_b^*$, we find that the observed invariant mass distribution is reproduced assuming its spin and parity $J^P = 1/2^+$. We discuss that the ratio of the two sequential processes and angular correlation of two pions are useful for the determination of spin and parity. We suggest further studies for the Roper resonance analogue in various flavor contents, raising an interesting and important question in baryon spectroscopy.
