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

A. Abada·D. Becirevic·Ph. Boucaud·G. Herdoiza·J. P. Leroy·A. Le Yaouanc·O. Pene·J. Rodríguez-Quintero
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Abstract

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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A. Abada, D. Becirevic, Ph. Boucaud, G. Herdoiza, J. P. Leroy, A. Le Yaouanc, O. Pene, J. Rodríguez-Quintero. 2002-07-29. First lattice QCD estimate of the g_{D^* D pi} coupling. https://doi.org/10.1103/physrevd.66.074504

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