The 't Hooft interaction at finite T and $μ$: Beyond the mean field theory

Details The 't Hooft interaction at finite T and $μ$: Beyond the mean field theory The 't Hooft interaction at finite T and $μ$: Beyond the mean field theory

2000-07-19

arxiv.org/abs/hep-ph/0007210v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 2 figures. Major editorial changes including the title and the abstract but no changes in results

Scientific paper

We use the N-quantum approach (NQA) to quantum field theory to construct a solution of the two flavor effective instanton induced `t Hooft interaction model valid for any temperature (T) and chemical potential ($\mu$) beyond the mean field theory. The model contains only the $\bar{q}q$ channels. In constructing this solution we calculate the masses, widths and coupling constants of bound $\sigma$ and resonant color $\bar{3}$ scalar diquark states. We find that the chemical potential induced by the interaction cancel exactly for all values of T in contrast to the Nambu-Jona-Lasinio model. Our method can also be extended to include the qq channels in the model Lagrangian and we discuss how the NQA can be used to study the properties of bound diquark states at finite T and $\mu$.

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