Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-09-05
Nucl.Phys.Proc.Suppl. 93 (2001) 134-139
Physics
High Energy Physics
High Energy Physics - Phenomenology
Invited lecture presented by P. Singer at IV Intern.Conference on Hyperons,Charm and Beauty Hadrons,June27-30,2000,Valencia,Sp
Scientific paper
10.1016/S0920-5632(00)01077-X
We describe a calculation of the two-photon decays of heavy vector-mesons, $B^*\to B\gamma\gamma$ and $D^*\to D\gamma\gamma$, by using the ``heavy meson chiral Lagrangian''. The decay amplitudes are expressed in terms of the strong coupling $g$ of the Lagrangian at various powers and the strength of the anomalous magnetic dipole $\mu_{B^*B\gamma}$ (respectively $\mu_{D^*D}\gamma$). In the charm case we are able to express the branching ratio $\Gamma(D^{*0}\to D^0\gamma\gamma)/\Gamma(D^{*0})$ as a function of $g$ only and we expect it to be in the $10^{-6}-10^{-5}$ range, depending on the value of $g$. The determination of $\mu_{B^{*0}B^{0}\gamma},\mu_{B^{*+}B^+}\gamma$ requires a more involved analysis, including the consideration of bremsstrahlung radiation for the $B^{*+}\to B^+\gamma\gamma$ case.
Guetta Dafne
Singer Paul
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