First lattice QCD estimate of the g_{D^* D pi} coupling

Details First lattice QCD estimate of the g_{D^* D pi} coupling First lattice QCD estimate of the g_{D^* D pi} coupling

2002-06-24

arxiv.org/abs/hep-ph/0206237v3

Phys.Rev.D66:074504,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 7 figures; references added, corrected typos, Comments added about the continuum limit

Scientific paper

10.1103/PhysRevD.66.074504

We present the results of the first lattice QCD study of the strong coupling g_{D^* D pi}. From our simulations in the quenched approximation, we obtain g_{D^* D pi} = 18.8 +/- 2.3^{+1.1}_{-2.0} and hat(g)_c = 0.67 +/- 0.08^{+0.04}_{-0.06}. Whereas previous theoretical studies gave different predictions, our result favours a large value for hat(g)_c. It agrees very well with the recent experimental value by CLEO. hat(g) varies very little with the heavy mass and we find in the infinite mass limit hat(g)_infinity = 0.69(18).

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