论文标题
LHCB状态$ p_ {ψs}^λ（4338）$作为三角形奇异性
The LHCb state $P_{ψs}^Λ(4338)$ as a triangle singularity
论文作者
论文摘要
我们为$ b^ - \ in $ b^ - \ to j/ψλ\ bar {p} $衰减的$ j/ψλ$ spectrum介绍了一个模型，包括$ p_ {ψs}^λ（4338）$ baryon最近被LHCB Collaboration观察到。我们假设通过三角图生产，通过非扰动相互作用将夫妇置于最终状态，这些相互作用受到重夸克和$ su_3 $ - 味的对称性的约束。大部分分布是由带有颜色的electroweak顶点的三角形图来描述的，而尖锐的$ p_ {ψs}^λ（4338）$增强是由于另一个图中的三角形奇异性造成的，其另一个图中具有$ 1/2^ - $ 1/2^ - $ baryon符合$ $σ_c（2800）$。我们预测一个可比的$ p_ {ψs}^λ（4338）$信号在$η_cλ$中，并预测可能会通过衰减到$ j/ψς^0 $和$η_cσ^0 $的大型isospin混合效果
We present a model for the $J/ψΛ$ spectrum in $B^-\to J/ψΛ\bar{p}$ decays, including the $P_{ψs}^Λ(4338)$ baryon recently observed by the LHCb collaboration. We assume production via triangle diagrams which couple to the final state via non-perturbative interactions which are constrained by heavy-quark and $SU_3$-flavor symmetry. The bulk of the distribution is described by a triangle diagram with a color-favored electroweak vertex, while the sharp $P_{ψs}^Λ(4338)$ enhancement is due to the triangle singularity in another diagram featuring a $1/2^-$ baryon consistent with $Σ_c(2800)$. We predict a comparable $P_{ψs}^Λ(4338)$ signal in $η_c Λ$, and anticipate possible large isospin mixing effects through decays to $J/ψΣ^0$ and $η_c Σ^0$
