Isospin breaking in the yield of heavy meson pairs in e+e- annihilation near threshold

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dc.creatorDubynskiy, S.
dc.creatorYaouanc, A. Le
dc.creatorOliver, L.
dc.creatorRaynal, J. -C.
dc.creatorVoloshin, M. B.
dc.date2007-04-03
dc.date.accessioned2026-07-07T10:20:14Z
dc.date.available2026-07-07T10:20:14Z
dc.descriptionWe revisit the problem of interplay between the strong and the Coulomb interaction in the charged-to-neutral yield ratio for $B {\bar B}$ and $D {\bar D}$ pairs near their respective thresholds in $e^+e^-$ 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 $K {\bar K}$ production at the $ϕ(1020)$ 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.
dc.description16 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/0704.0293
dc.identifierhttp://arxiv.org/abs/0704.0293
dc.identifierPhys.Rev.D75:113001,2007
dc.identifierdoi:10.1103/PhysRevD.75.113001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/174784
dc.subjectHigh Energy Physics - Phenomenology
dc.titleIsospin breaking in the yield of heavy meson pairs in e+e- annihilation near threshold
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