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

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

2009-03-13

arxiv.org/abs/0903.2407v2

Eur.Phys.J.C71:1734,2011

Physics

High Energy Physics

High Energy Physics - Lattice

22 pages, 3 figures

Scientific paper

10.1140/epjc/s10052-011-1734-y

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.

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