Electromagnetic vertex function of the pion at T > 0
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 nonperturbatively improved Sheikholeslami-Wohlert action is used together with the corresponding 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.
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