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Nonlocal Quark Model Beyond Mean Field and QCD Phase Transition

Авторы: Blaschke D., Volkov M.K., Buballa M., Radzhabov A.E.

Журнал: Nuclear Physics B-Proceedings Supplements

Том: 198

Номер: 6

Год: 2010

Отчётный год: 2010

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Местоположение издательства:

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DOI: 10.1016/j.nuclphysbps.2009.12.01141

Аннотация: Non local chiral quark model is self-consistently extended beyond mean field using a strict 1/N(c) expansion scheme. The parameters of the nonlocal model are refitted to the physical values of the pion mass and the weak pion decay constant. The size of the 1/N(c) correction to the quark condensate is carefully studied in the nonlocal and the usual local Nambu-Jona-Lasinio models. It is found that even the sign of the corrections can be different. This can be attributed to the mesonic cut-off of the local model. It is also found that the 1/N(c) corrections lead to lowering of the temperature of the chiral phase transition in comparison with the mean-field result. On the other hand, near the phase transition the 1/N(c) expansion breaks down and a. non-perturbative scheme for the inclusion of mesonic correlations is needed in order to describe the phase transition point.

Индексируется WOS: Q4

Индексируется Scopus: Нет

Индексируется УБС: Нет

Индексируется РИНЦ: Да

Индексируется ВАК: Нет

Индексируется CORE: Нет

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