The Fermion Boson Interaction Within the Linear Sigma Model at Finite Temperature

Details The Fermion Boson Interaction Within the Linear Sigma Model at Finite Temperature The Fermion Boson Interaction Within the Linear Sigma Model at Finite Temperature

2001-01-25

arxiv.org/abs/hep-ph/0101283v3

Nucl.Phys. B623 (2002) 503-512

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, RevTeX, 1 eps figure; one reference added, to appear in Nucl. Phys. B

Scientific paper

We reinvestigate the interaction of massless fermions with massless bosons at finite temperature. Specifically, we calculate the self-energy of massless fermions due the interaction with massless bosons at high temperature, which is the region where thermal effects are maximal. The calculations are concentrated in the limit of vanishing fermion three momentum and after considering the effective fermion and boson dressed masses, we obtain the damping rate of the fermion up to order $g^3$. It is shown that in the limit $k_0 \ll T$ the fermion acquire a thermal mass of order $gT$ and the leading term of the fermion damping rate is of order $g^2T+g^3T$.

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