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X(6900) peak could be a molecular state

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PHYSICAL REVIEW D
卷 107, 期 9, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.107.094006

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Analyses of the LHCb data indicate that the X(6900) particle found in the di-J/psi and J/psi psi(3686) systems may not be a molecule of J/psi psi(3686) based on a momentum-dependent Flatte-like parametrization. However, it is still possible that X(6900) could be a molecule consisting of higher states such as J/psi psi(3770), chi(c0)chi(c2), etc.
Analyses of the LHCb data on X(6900) found in di-J/psi and J/psi psi(3686) systems are performed using a momentum-dependent Flatte-like parametrization. The use of the pole-counting rule and spectral density function sum rule give consistent conclusions that X(6900) may not be a molecule of J/psi psi(3686). Nevertheless, it is still possible that X(6900) is a molecule of higher states, such as J/psi psi(3770), chi(c0)chi(c2), etc.

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