Quantum fluctuations of chiral condensate in the analytically regularized Nambu--Jona-Lasinio model

Details Quantum fluctuations of chiral condensate in the analytically regularized Nambu--Jona-Lasinio model Quantum fluctuations of chiral condensate in the analytically regularized Nambu--Jona-Lasinio model

2003-11-29

arxiv.org/abs/hep-ph/0312004v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, no figures, Talk given at XVII International Workshop on High Energy Physics and Quantum Field Theory (QFTHEP'2003),

Scientific paper

The problem of quantum fluctuations of the chiral condensate due to next-to-leading contributions is investigated. Meson contributions to the chiral condensate are calculated in the Nambu--Jona-Lasinio model with the analytical (dimensional) regularization in a framework of the mean-field expansion. The pion contribution can be significant, while the sigma-meson contribution is small in the regime of physical values of the model parameters. Non-pole contributions are also estimated and found to be small.

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