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It is shown that the ratio of the production rates of the pairs (B+ B-) and(B0 anti-B0) should experience a substantial and rapid variation with energywithin the width of the Upsilon(4S) resonance, crossing the value of one nearthe center of the resonance. This behavior is due to an interference of therapidly changing with energy Breit-Wigner phase with the phase introduced inthe wave function of charged mesons by their Coulomb interaction.Comment: 10 page

Variation of the Relative Yield of Charged and Neutral B Mesons Across the ϒ(4S) Resonance