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- W2040202237 abstract "The long-distance vector-meson-dominance (VMD) effects on the weak radiative decays Bifmmodebarelsetextasciimacronfi{}ensuremath{rightarrow}ensuremath{rho}ensuremath{gamma} and Bifmmodebarelsetextasciimacronfi{} $^{0}mathit{D}^{mathrm{*}0}$ensuremath{gamma} are studied. For Bifmmodebarelsetextasciimacronfi{}ensuremath{rightarrow}ensuremath{rho}ensuremath{gamma} decays, the VMD contribution is (10--20)% of the short-distance penguin amplitude. The pole effect is as important as the VMD one in the decay ${mathit{B}}^{mathrm{ensuremath{-}}}$ensuremath{rightarrow}${mathrm{ensuremath{rho}}}^{mathrm{ensuremath{-}}}$ensuremath{gamma}, but it is suppressed in Bifmmodebarelsetextasciimacronfi{} $^{0}mathrm{ensuremath{rho}}^{0}$ensuremath{gamma}. The branching ratio of Bifmmodebarelsetextasciimacronfi{}ensuremath{rightarrow}ensuremath{rho}ensuremath{gamma}, estimated to be of order ${10}^{mathrm{ensuremath{-}}6}$, strongly depends on the sign of the Wolfenstein parameter ensuremath{rho}. A measurement of any deviation of the ratio R=ensuremath{Gamma}(${mathit{B}}^{mathrm{ensuremath{-}}}$ensuremath{rightarrow}${mathrm{ensuremath{rho}}}^{mathrm{ensuremath{-}}}$ensuremath{gamma})/ensuremath{Gamma}(Bifmmodebarelsetextasciimacronfi{} $^{0}mathrm{ensuremath{rho}}^{0}$ensuremath{gamma}) away from the isospin value 2 will provide a probe on the long-range contribution and possibly indicate the sign of ensuremath{rho}: R>2 for ensuremath{rho}0 and Rensuremath{sim}2 for ensuremath{rho}>0. The decay Bifmmodebarelsetextasciimacronfi{} $^{0}mathit{D}^{mathrm{*}0}$ensuremath{gamma} does not receive short-distance contributions, and its branching ratio, predicted to be 0.9ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}6}$, is dominated by W exchange accompanied by a photon emission." @default.
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- W2040202237 date "1995-06-01" @default.
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- W2040202237 title "Vector dominance effects in weak radiative decays ofBmesons" @default.
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- W2040202237 doi "https://doi.org/10.1103/physrevd.51.6228" @default.
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