The scalar exotic resonances $$X(3915), X(3960), X_0(4140)$$

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چکیده

The scalar resonances $X(3915), X(3960), X(4140)$ are considered as exotic four-quark states: $cq\bar c \bar q, cs\bar s, c\bar s$, while the $X(3863)$ is proved to be $c\bar c, 2\,^3P_0$ state. masses and widths of these calculated in framework Extended Recoupling Model, where a system formed inside bag has relatively small size ($\la 1.0$~fm). Then resonance $X(3915)$ appears due transitions: $J/\psi\omega$ into $D^{*+}D^{*-}$ (or $D^{*0}\bar D^{*0})$ back, $X(3960)$ created transitions $D_s^+D_s^-$ $J/\psi\phi$ $X(4140)$ $D_s^{*+}D_s^{*-}$ back. characteristic feature recoupling mechanism that this type can predominantly $S$-wave decay channels $J^P=0^+$. In two-channel case occurs just near lower threshold, coupling third channel (like c$ channel) it shifted up lies by (20--30)~MeV above threshold. following calculated: $M(X(3915))=3920$~MeV, $\Gamma(X(3915))=20$~MeV; $M(X(3960))=3970$~MeV, $\Gamma(X(3960)=45(5)$~MeV, $M(X(4140))= 4120(20)$~MeV, $\Gamma(X(4140))=100$~MeV, which good agreement with experiment.

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ژورنال

عنوان ژورنال: European Physical Journal C

سال: 2023

ISSN: ['1434-6044', '1434-6052']

DOI: https://doi.org/10.1140/epjc/s10052-023-11590-z