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The Pion Form Factor on the Lattice at Zero and Finite Temperature

Authors:	J van der Heide J H Koch E Laermann

Institution:	(1) National Institute for Nuclear Physics and High-Energy Physics (NIKHEF), 1009 DB Amsterdam, The Netherlands;(2) Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany

Abstract:	We calculate the electromagnetic form factor of the pion in quenched lattice QCD. The non-perturbatively improved Sheikoleslami-Wohlert lattice action is used together with the consistently ${\cal O}(a)$ -improved current. We calculate the pion form factor for masses down to m_π = 360 MeV, extract the charge radius, and extrapolate toward the physical pion mass. In the second part, we discuss results for the pion form factor and charge radius at 0.93 T_c and compare with zero temperature results.

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