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Finite temperature pion vector form factors in chiral perturbation theory

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2005-01-27
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Elsevier Science Bv
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We discuss the thermal behaviour of the pion vector form factors and calculate them in one-loop chiral perturbation theory. The perturbative result is used to analyze the T dependent electromagnetic pion charge radius, obtaining a rough estimate of the deconfinement critical temperature. Imposing thermal unitarity, we generate the ρ resonance pole for the form factor in the center of mass frame. The ρ peak height in the modulus of the form factor decreasesfor increasing temperature, while its width increases and the peak position is slightly shifted downwards for T _ 150 MeV. These results point in the direction suggested by many analysis of dilepton production data in relativistic heavy ion collisions.
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© 2004 Elsevier B.V. All rights reserved. Work supported from the Spanish CICYT projects, FPA2000 0956, PB98-0782 and BFM2000-1326.
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