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

TL;DR

This paper reports the first direct lattice QCD calculation of the g_{D^* D pi} coupling, providing results consistent with experimental data, and introduces a new computational approach in the quenched approximation.

Contribution

It presents the first direct lattice QCD determination of the g_{D^* D pi} coupling, advancing theoretical understanding of this parameter.

Findings

g_{D^* D pi} = 18.8 +/- 2.3^{+1.1}_{-2.0}

hat(g) = 0.67 +/- 0.08^{+0.04}_{-0.06}

Results agree with CLEO experimental measurements

Abstract

We present the results of the first direct determination of the g_{D^* D pi} coupling using lattice QCD. From our simulations in the quenched approximation, we obtain g_{D^* D pi} = 18.8 +/- 2.3^{+1.1}_{-2.0} and hat(g) = 0.67 +/- 0.08^{+0.04}_{-0.06}. It is in agreement with a recent experimental result from CLEO.