The linear sigma model at a finite isospin chemical potential

Details The linear sigma model at a finite isospin chemical potential The linear sigma model at a finite isospin chemical potential

2006-06-22

arxiv.org/abs/hep-ph/0606241v2

J.Phys. G32 (2006) 2187-2198

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 6 figures; Version to appear in J. Phys. G

Scientific paper

10.1088/0954-3899/32/11/012

The effect of finite isospin chemical potential to the effective masses of the mesons at finite temperature is investigated in the framework of the O(4) linear sigma model with explicit chiral symmetry breaking. We present a mechanism to include the isospin chemical potential in the model. By using the Cornwall-Jackiw-Tomboulis method of composite operators, we obtain a set gap equations for the effective masses of the mesons and get the numerical results in the Hartree approximation. We find that the introduction of the chemical potential only affects the mass of the charged pions and sigma, while there is almost NO effects on the mass of neutral pions.

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