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- W2963485206 abstract "We study the novel decays $B^{*}to Bgammagamma $ and $D^{*}to Dgamma gamma $ using the framework of the Heavy Meson Chiral Lagrangian (HM$chi$L) to leading order in chiral perturbation theory. The branching ratios of these decays are expressed in terms of the strong $g_{B^{*}(D^{*})B(D)pi}$ and the electromagnetic $g_{B^{*}(D^*)B(D)gamma}$ couplings, thus providing a possible tool for their determination. In the charm case, using the experimentally determined ratios $({D^*}^{0,+}to Dpi)/({D^*}^{0,+}to Dgamma),$ we are able to express the branching ratio as a function of the strong coupling only. We thus find $1.6times 10^{-6} 0.6.$ The expected two-photon differential distributions are presented for both ${B^{*}}^{0} to B^0 gammagamma$ and ${D^{*}}^{0}to D^0gammagamma,$ for different values of the couplings involved." @default.
- W2963485206 created "2019-07-30" @default.
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- W2963485206 date "1999-04-26" @default.
- W2963485206 modified "2023-09-27" @default.
- W2963485206 title "Two photon decays of heavy vector mesons $B^*to Bgamma gamma$,$D^*to Dgamma gamma$, and the strong coupling $g_{B^*(D^*)B(D)pi}$" @default.
- W2963485206 hasPublicationYear "1999" @default.
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