No massless pions in Nambu-Jona-Lasinio model due to chiral fluctuations
Aug, 1999Citations per year
Abstract:
In contrast to common belief, the chirally symmetric Nambu--Jona-Lasinio model does not contain massless pions, due to strong chiral fluctuations. Although quarks acquire spontaneously a nonzero constituent mass , pions have a nonzero mass equal to the mass of \s -mesons, both being of the order of . This result is found in several cutoff schemes. Our derivation is nonperturbative, but involves a simple approximation (London limit) which should, however, receive only quantitative, no qualitative corrections.- Jona-Lasinio-Nambu model
- symmetry: chiral
- fluctuation
- critical phenomena
- pi: massive
- f0(600): massive
- numerical calculations
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