S@INT Seminar: "Photoproduction of the rho resonance on the lattice"

I will present results on the rho resonance photoproduction from our recent lattice QCD study with N_f=2+1 clover fermions at a pion mass of approximately 320 MeV and lattice size 3.6 fm. The transition amplitude describing the photoproduction of the rho resonance on a pion is obtained from the more general process pi gamma to pi pi where the final state is in P-wave with quantum numbers I=1 and J^P=1^-. We employ the Briceno-Hansen-Walker-Loud approach to determine the pi gamma to pi pi transition amplitude in the invariant mass region near the rho resonance for both space- and time-like photon momentum. By analytic continuation to the rho pole we calculate also the rho radiative decay width.