Two photon decays of heavy vector mesons, $B^{*}\to Bγ γ$,$D^{*}\to Dγγ$, and the possible determination of the $g_{B^{*}(D^{*})B(D)π}$ and $g_{B^{*}^0B^0γ}$ couplings

Details Two photon decays of heavy vector mesons, $B^{*}\to Bγ γ$,$D^{*}\to Dγγ$, and the possible determination of the $g_{B^{*}(D^{*})B(D)π}$ and $g_{B^{*}^0B^0γ}$ couplings Two photon decays of heavy vector mesons, $B^{*}\to Bγ γ$,$D^{*}\to Dγγ$, and the possible determination of the $g_{B^{*}(D^{*})B(D)π}$ and $g_{B^{*}^0B^0γ}$ couplings

1999-04-26

arxiv.org/abs/hep-ph/9904454v2

Phys.Rev. D61 (2000) 054014

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, LaTeX, 5 ps-figures (uses subfigure.sty). Accepted by Phys. Rev. D

Scientific paper

10.1103/PhysRevD.61.054014

We study the novel decays $B^{*}\to B\gamma\gamma $ and $D^{*}\to D\gamma \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 $({D^*}^{0,+}\to D\pi)/({D^*}^{0,+}\to D\gamma),$ we are able to express the branching ratio as a function of the strong coupling only. We thus find $1.6\times 10^{-6}<{\rm Br} ({D^{*}}^{0}\to D^0\gamma\gamma)<3.3\times 10^{-5}$ for $0.250.6.$ The expected two-photon differential distributions are presented for both ${B^{*}}^{0} \to B^0 \gamma\gamma$ and ${D^{*}}^{0}\to D^0\gamma\gamma,$ for different values of the couplings involved.

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