2024
DOI: 10.1088/1674-1137/ad2361
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A discussion on the anomalous threshold enhancement of – couplings and peak*

Ye 业 Lu 陆,
Chang 畅 Chen 陈,
Guang-You 广友 Qin 秦
et al.

Abstract: The attractive interaction between $J/\psi$ and $\psi(3770)$ has to be strong enough if $X(6900)$ is of molecule type. We argue that since $\psi(3770)$ decays predominantly into a $D\bar D$ pair, the interactions between $J/\psi$ and $\psi(3770)$ may be significantly enhanced due to the three point $D\bar D$ loop diagram. The enhancement comes from the anomalous threshold located at $t=-1.288$GeV$^2$, which effect propagates into the $s$-channel partial wave amplitude in the vicinity of $\sqrt{s}\simeq 6.94… Show more

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