Isospin breaking in the yield of heavy meson pairs in e{sup +}e{sup -} annihilation near threshold
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (United States)
- Laboratoire de Physique Theorique - Unite Mixte de Recherche UMR 8627-CNRS, Universite de Paris XI, Batiment 210, 91405 Orsay Cedex (France)
- William I. Fine Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455 (United States)
We revisit the problem of interplay between the strong and the Coulomb interaction in the charged-to-neutral yield ratio for BB and DD pairs near their respective thresholds in e{sup +}e{sup -} annihilation. We consider here a realistic situation with a resonant interaction in the isospin I=0 channel and a nonresonant strong-scattering amplitude in the I=1 state. We find that the yield ratio has a smooth behavior depending on the scattering phase in the I=1 channel. The same approach is also applicable to the KK production at the {phi}(1020) resonance, where the Coulomb effect in the charged-to-neutral yield ratio is generally sensitive to the scattering phases in both the isoscalar and the isovector channels. Furthermore, we apply the same approach to the treatment of the effect of the isotopic mass difference between the charged and neutral mesons and argue that the strong-scattering effects generally result in a modification to the pure kinematical effect of this mass difference.
- OSTI ID:
- 20929533
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 75, Issue 11; Other Information: DOI: 10.1103/PhysRevD.75.113001; (c) 2007 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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