Speaker
Description
In pNRQCD, the inclusive P-wave heavy quarkonium decay width into light hadrons factorizes at a scale $\Lambda$, and the non-perturbative contribution reduces to $\mathcal{E}_3$, an integral over the correlator of two electric fields connected by an adjoint Wilson line. This correlator is universal, independent of the specific initial state. In this work, we developed a new method that employs gradient flow to subtract the power divergence of the Wilson line and to match the chromoelectric correlator to the $\overline{\mathrm{MS}}$ scheme. These are the first non-perturbative results for the chromoelectric correlator at zero temperature, and we present with them first-principles results for P-wave decay widths of charmonium and bottomonium.