Speaker
Description
The distribution amplitudes (DAs) for a heavy quark system are not known well and are very challenging. One tries to model them using heavy quark effective field theory. However, there is a free parameter involved which is related to the inverse moments of DAs. Its value needs to be fixed using some experimental data. For the case of B-meson, it is done using the information on the $B \to \ell \nu_\ell \gamma$ process which helps us in limiting its value by providing limits. For the case of D-meson, the uncertainty in its value is very large which leads to huge uncertainties in the non-perturbative hadronic quantities like form factors. \
In this talk, we will shed some light on these issues and will discuss a possible solution using the experimental data of $D_q^* \to D_q \gamma$ (q=u,d,s) decays and comparing them with the results obtained using Light Cone Sum Rules. We will show how such an estimation can provide better and complementary results for these unknown parameters.
| Session | Quark and Lepton Flavour Physics |
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