D*-->Dpi and D*-->Dgamma decays: Axial coupling and Magnetic moment of D* meson

TL;DR

This paper uses lattice QCD with dynamical quarks to compute the axial coupling and magnetic moment of the D*-meson, providing new theoretical insights into its decay processes and comparing results with experimental data.

Contribution

First lattice QCD calculation of the D* meson's magnetic moment, specifically g(D*Dgamma), with detailed analysis of decay couplings g(D*Dpi) and g(D*Dgamma).

Findings

g(D*Dpi)=20 +/- 2

g(D0*D0gamma)=[2.0 +/- 0.6]/GeV

First lattice determination of g(D0*D0gamma)

Abstract

The axial coupling and the magnetic moment of D*-meson or, more specifically, the couplings g(D*Dpi) and g(D*Dgamma), encode the non-perturbative QCD effects describing the decays D*-->Dpi and D*-->Dgamma. We compute these quantities by means of lattice QCD with Nf=2 dynamical quarks, by employing the Wilson ("clover") action. On our finer lattice (a=0.065 fm) we obtain: g(D*Dpi)=20 +/- 2, and g(D0*D0gamma)=[2.0 +/- 0.6]/GeV. This is the first determination of g(D0*D0gamma) on the lattice. We also provide a short phenomenological discussion and the comparison of our result with experiment and with the results quoted in the literature.