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Determination of the strong g-coupling and of the $\mu_{B^*B\gamma}-$ strength from two-photon decays of heavy vector mesons
High Energy Physics - Phenomenology · Submitted 5 Sep 2000
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim 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 $g$.
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The abstract, sentence by sentence
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.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | 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''. | contribution 0.88 | 0.93 | 0.06 | asserted 0.99 |
| s1 | 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 $\mu_{D^*D}\gamma$). | method 0.86 | 0.83 | 0.08 | asserted 1.00 |
| s2 | 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 $g$. | result 0.98 | 0.86 | 0.32 | hedged possibility 0.56 |
| s3 | 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. | method 0.63 | 0.52 | 0.08 | asserted 0.99 |
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The paper
Original abstract
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.
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States the same result 1 paper
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It is shown that the branching ratio of $D^*\to D\gamma\gamma$ can be expressed as a function of a single unknown $g$ and we calculate it to be in the measurable range between $1.6\times 10^{-6}$ and $3.3\times 10^{-5}$ for 0.25 < g < 1.
Radiative Decays of Heavy Mesons and the Determination of the Strong g-Coupling · 0.90
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