论文标题
可能的$λ_c\barλ_c$分子状态及其在nulceon-antinulceon碰撞中的作品
Possible $Λ_c\barΛ_c$ molecular states and their productions in nulceon-antinulceon collision
论文作者
论文摘要
在这项工作中，通过核定 - 甲基核心碰撞的$λ_c\barλ_c$相互作用对可能的分子状态进行研究。带有量子数字的两个绑定状态$ j^{pc} = 0^{ - +} $，$ 1^{ - } $从$λ_C\barλ_c$交互中产生几乎相同的绑定能量，这是由光中音交换所描述的。但是，结果不支持实验观察到的$ y（4630）$作为$λ_C\barλ_c$分子状态，因为很难在$ y（4630）$的实验质量附近获得高于$λ_C\barλ_c$ threshold的峰值质量（4630）$。通过将耦合到$ n \ bar {n} $和$ d^{（*）} \ bar {d}^{（*）} $ CHANNELS中，可以在核子 - antinucleon碰撞中搜索这些状态的可能性。显然可以在$ d^*\ bar {d}^*$通道的$λ_C\barλ_c$ threshold附近找到峰。 $ 0^{ - +} $的状态宽度太小可能会导致在实验中观察到的困难。根据当前工作的结果，在过程中搜索$ 1^{ - } $的$λ_C\barλ_c$分子状态，在$ n \ bar {n} \ to d^*\ bar {d}^*$中建议，在$ \ rm \ rm \ bar {p} anda anda anda andA $。
In this work, a study of possible molecular states from the $Λ_c\barΛ_c$ interaction and their productions in nucleon-antinucleon collision is performed in a quasipotential Bethe-Salpeter equation approach. Two bound states with quantum numbers $J^{PC}=0^{-+}$ and $1^{--}$ are produced with almost the same binding energy from the $Λ_c\barΛ_c$ interaction which is described by the light meson exchanges. However, the result does not support the assignment of experimentally observed $Y(4630)$ as a $Λ_c\barΛ_c$ molecular state because it is hard to obtain a peak near experimental mass of the $Y(4630)$ which is far above the $Λ_c\barΛ_c$ threshold. The possibility to search these states in nucleon-antinucleon collision is studied by including couplings to $N\bar{N}$ and $D^{(*)}\bar{D}^{(*)}$ channels. The peaks can be found obviously near the $Λ_c\barΛ_c$ threshold in the $D^*\bar{D}^*$ channel at an order of amplitude of 10 $μ$b. Too small width of state with $0^{-+}$ may lead to the difficulty to be observed in experiment. Based on the results in the current work, search for the $Λ_c\barΛ_c$ molecular state with $1^{--}$ is suggested in process $N\bar{N}\to D^*\bar{D}^*$, which is accessible at $\rm \bar{P}ANDA$.
