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arXiv · 2405.11552

The impact of quark many-body effects on exotic hadrons

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

We investigate the exotic hadrons consisting of two light quarks and two heavy antiquarks, $(q\bar Q)$-$(q\bar Q)$. The spin-dependent term between quarks is known to give an attraction to the $ud$ spin-0 component in the isospin-0 $u\bar c d\bar c$ system, $T_{cc}$. However, the said component also gets a repulsion from the partial Pauli-blocking. By the dynamical calculation with a simplified quark model, we discuss that the competition of the two effects leads to a shallow bound state for $T_{cc}$, which is preferred from the experiment, and a deep bound state for $T_{bb}$.

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Sachiko Takeuchi, Makoto Takizawa, Yasuhiro Yamaguchi, Atsushi Hosaka. 2024-05-19. The impact of quark many-body effects on exotic hadrons. https://doi.org/10.1007/s00601-024-01932-2

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