cc purity of {psi}(3770) and {psi}{sup '} challenged
- William I. Fine Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455 (United States) and Institute of Theoretical and Experimental Physics, Moscow, 117259 (Russian Federation)
It is suggested that the resonance {psi}(3770) may contain a sizeable (O(10%) in terms of the probability weight factor) four-quark component with the up- and down-quarks and antiquarks in addition to the cc pair, which component in itself has a substantial part with isospin I=1. Furthermore such a four-quark part of the wave function should also affect the properties of the {psi}{sup '} charmonium resonance through the {psi}(3770)-{psi}{sup '} mixing previously considered in the literature. It is argued that an admixture of extra light quark pairs can explain a possible discrepancy between the theoretical expectations and the recent data on the non-DD decay width of the {psi}(3770) and the ratio of the yield of charged and neutral D meson pairs in its decays, as well as on the extra rate of the {psi}{sup '} direct decay into light hadrons and the rate of the decay {psi}{sup '}{yields}{pi}{sup 0}J/{psi}. It is further argued that the suggested four-quark component of the wave function of the {psi}(3770) should give rise to a measurable rate for the decays {psi}(3770){yields}{eta}J/{psi} and {psi}(3770){yields}{pi}{sup 0}J/{psi}.
- OSTI ID:
- 20709448
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 71, Issue 11; Other Information: DOI: 10.1103/PhysRevD.71.114003; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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