TL;DR
This paper presents recent discoveries in hidden charm spectroscopy from Belle, including new particle states and decay processes observed in e+e- collision data, advancing understanding of exotic hadrons.
Contribution
It reports new experimental observations of particle states and decay modes in hidden charm spectroscopy, providing novel insights into exotic hadron structures.
Findings
Observation of a near-threshold enhancement in omega-J/psi invariant mass
Evidence for X(3872) decaying into pi+pi-pi0 J/psi
Detection of a peak near 3940 MeV in J/psi recoil mass spectrum
Abstract
I report recent results on hidden charm spectroscopy from Belle. These include: observation of a near-threshold enhancement in the omega-J/psi invariant mass distribution for exclusive B-->K omega J/psi decays; evidence for the decay X(3872)-->pi+pi-pi0 J/psi, where the pi+pi-pi0 invariant mass distribution has a strong peak between 750 MeV and the kinematic limit of 775 MeV, suggesting that the process is dominated by the sub-threshold decay X-->omega J/psi; and the observation of a peak near 3940 MeV in the J/psi recoil mass spectrum for the inclusive continuum process e+e- --> J/psi X. The results are based on a study of a 287 fb-1 sample of e+e- annihilation data collected at center- of-mass energies around the Upsilon(4S) in the Belle detector at the KEKB collider.
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