An effective Hamiltonian including current-current coupling from the global color symmetry model is derived.Retardation effects are introduced by the factor (R/√π)e-R2γ2 ,instead of δ(r) in the correlation kernel,from which the retardation gap equation with α-α coupling in the 3Po vacuum is obtained,qq condensations of different retardation parameters R with or without the α-α term are calculated.The results show the effects of retardation,and indicate that the typical value of R is about 2 fm-1 at reasonable value of qq condensation.And while taking typical value 1 fm-1 of R,the condensation 1/3 is about 13% larger than that with no retardation effect.With the α-αterms,the condensation 1/3 is about 17% larger than that without it for all values of the parameter R.This shows that the retardation effects and the α-α terms are important for further studying in the Iow-energy region.
Abstract
An effective Hamiltonian including current-current coupling from the global color symmetry model is derived.Retardation effects are introduced by the factor (R/√π)e-R2γ2 ,instead of δ(r) in the correlation kernel,from which the retardation gap equation with α-α coupling in the 3Po vacuum is obtained,qq condensations of different retardation parameters R with or without the α-α term are calculated.The results show the effects of retardation,and indicate that the typical value of R is about 2 fm-1 at reasonable value of qq condensation.And while taking typical value 1 fm-1 of R,the condensation 1/3 is about 13% larger than that with no retardation effect.With the α-αterms,the condensation 1/3 is about 17% larger than that without it for all values of the parameter R.This shows that the retardation effects and the α-α terms are important for further studying in the Iow-energy region.
关键词
effect of retardation /
condensation /
spontaneous breaking of chiral symmetry
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Key words
effect of retardation /
condensation /
spontaneous breaking of chiral symmetry
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参考文献
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脚注
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基金
The project supported in part by National Natural Science Foundation of China (19875002)
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