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arXiv · 2507.16752

Di-$J/\psi$ structures from the quark Pauli-blocking effect

Sachiko Takeuchi·Atsushi Hosaka·Makoto Takizawa·Yasuhiro Yamaguchi
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Abstract

The double-charmonium scattering states such as $J/\psi J/\psi$, $\eta_cJ/\psi$, and $\eta_c\eta_c$ are investigated by a simplified quark cluster model. It is found that the quark Pauli-principle over the $c\bar c c\bar c$ system causes a rapid increase and a node in the two-meson phase shifts. The increase is not large enough to be regarded as a resonance, but if it is seen experimentally, that is most likely the quark Pauli-blocking effect.

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Sachiko Takeuchi, Atsushi Hosaka, Makoto Takizawa, Yasuhiro Yamaguchi. 2025-07-22. Di-$J/\psi$ structures from the quark Pauli-blocking effect. https://arxiv.org/abs/2507.16752

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