Thermal behavior of ?-? scattering lengths in the Nambu-Jona-Lasinio model

Loewe, M.; Jorge Ruiz A.; Rojas J.C.


We calculate the thermal evolution of ?-? scattering lengths, in the framework of the Nambu-Jona-Lasinio model. The thermal corrections were calculated at the one-loop level using thermofield dynamics. We present also results for the pion thermal mass. Our procedure implies the modeling of a propagating scalar meson as a resumation of chains of quark bubbles, which is presented explicitly. We compare our results with previous analysis of this problem in the framework of different theoretical approaches. © 2008 The American Physical Society.

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Título de la Revista: Physical Review D - Particles, Fields, Gravitation and Cosmology
Volumen: 78
Número: 9
Editorial: APS
Fecha de publicación: 2008