Abstract
We study the vector - vector system including all the possible channels with quan- tum numbers charm = 0, strangeness = 0 around the energy region of 4000 MeV. New states with hidden charm around 4000 MeV have been discovered by the B factories. They are intrigu- ingly close to the D �¯ Dand Ds ¯ Ds thresholds and do not have the properties of the charmonium states. We study the possible formation of D �¯ Dand D � ¯ Dbound states in the framework of the Hidden Gauge formalism and discuss some of the models that favor the molecular assumption of some XYZ states: The hidden gauge formalism, Heavy baryon Chiral Perturbation Theory and the compositeness condition of Weinberg.
Highlights
The B factories at SLAC, KEK and CESR that originally were constructed to test matter-antimatter asymetries or CP violation, within or beyond the standard model, have discovered a number of charm and hidden charm mesons that do not seem to have the properties of the charmonium states
We study the possible formation of D∗D ∗ and D∗s D ∗s bound states in the framework of the Hidden Gauge formalism and discuss some of the models that favor the molecular assumption of some XYZ states: The hidden gauge formalism, Heavy baryon Chiral Perturbation Theory and the compositeness condition of Weinberg
We have studied the C = 0 and S = 0 sector around the energy region of 4000 MeV within the hidden gauge formalism combined with coupled channel unitarity
Summary
The B factories at SLAC, KEK and CESR that originally were constructed to test matter-antimatter asymetries or CP violation, within or beyond the standard model, have discovered a number of charm and hidden charm mesons that do not seem to have the properties of the charmonium states. The coupling constants are calculated by means of the compositeness condition of Weinberg Some of them with quantum numbers, masses and widths compatible with the Z(3930), Y(3940) and X(4160)
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