Electromagnetic vertex function of the pion at T>0
/ Authors
/ Abstract
The matrix element of the electromagnetic current between pion states is calculated in quenched lattice QCD at a temperature of T=0.93 Tc. The non-perturbatively improved Sheikholeslami–Wohlert action is used together with the corresponding $\mathcal{O}(a)$ improved vector current. The electromagnetic vertex function is extracted for pion masses down to 360 MeV and momentum transfers Q2≤2.7 GeV2.
Journal: The European Physical Journal C - Particles and Fields