Summary
The contribution of the long-distance effects, namely parity-conserved and parity-violated form factors in the radiative decays of excited B**→ϱγ and D**→ϱγ are calculated in QCD light cone sum rule.
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Barakat, T. Radiative decays of excited meson in the light cone sum rules. Il Nuovo Cimento A (1971-1996) 110, 1411–1419 (1997). https://doi.org/10.1007/BF03185564
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DOI: https://doi.org/10.1007/BF03185564