Pion-nucleon -term: a QCD assessment
| Autor: | Shukla Basu, Subhra Niyogi |
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| Rok vydání: | 1990 |
| Předmět: | |
| Zdroj: | Journal of Physics G: Nuclear and Particle Physics. 16:L251-L256 |
| ISSN: | 0954-3899 |
| DOI: | 10.1088/0954-3899/16/11/003 |
| Popis: | Using a QCD estimate on the quark-vacuum condensate ratio (ss)0/(uu)0 the authors show, by deriving a sum rule, that the ratio of the meson wavefunction renormalization constants ZK12//Zpi 1/2 may deviate considerably from the SU(3) symmetric value of unity. This in turn raises the value of the pion-nucleon sigma -term from what is normally expected from the conventional GMOR scheme of chiral symmetry breaking. |
| Databáze: | OpenAIRE |
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