Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-02-17
Phys.Atom.Nucl.68:771-778,2005; Yad.Fiz.68:804-811,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 2 figures
Scientific paper
10.1134/1.1935010
The subject of the charged-to-neutral yield ratio for B{\bar B} and D{\bar D}pairs near their respective thresholds in e^+e^- annihilation is revisited. As previously argued for the B mesons, this ratio should exhibit a substantial variation across the Upsilon(4S) resonance due to interference of the resonance scattering phase with the Coulomb interaction between the charged mesons. A simple alternative derivation of the expression describing this effect is presented here, and the analysis is extended to include the D meson production in the region of the psi(3770) resonance. The available data on Kaon production at the phi(1020) resonance are also discussed in connection with the expected variation of the charged-to-neutral yield ratio.
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