منابع مشابه
Comment on "Confirmation of the Sigma Meson"
In Ref. [1], Törnqvist and Roos presented a model of ππ scattering which supports the existence of the old σ meson at a mass of 397 MeV and width 590 MeV. While this model is constructed to satisfy unitarity, it does not explicitly take crossing symmetry into account. In particular, one may question [2] the validity of neglecting the crossed-channel ρ meson exchange contributions, which are gen...
متن کاملComment on “Confirmation of the Sigma Meson”
In Ref. [1], Törnqvist and Roos presented a model of ππ scattering which supports the existence of the old σ meson at a mass of 397 MeV and width 590 MeV. While this model is constructed to satisfy unitarity, it does not explicitly take crossing symmetry into account. In particular, one may question [2] the validity of neglecting the crossed-channel ρ meson exchange contributions, which are gen...
متن کاملThe sigma meson and chiral restoration in nuclear medium
The whole content of the present talk is based on the simple fact that chiral transition is a phase transition of the QCD vacuum with the quark condensate 〈q̄q〉 being the order parameter. The relevance of the present talk to this workshop on physics with electromagnetic probes is ensured by the fact that chiral symmetry may be at least partially restored in hot and/or dense hadronic medium, hope...
متن کاملNature of Chiral Transition in QCD and Sigma Meson
After showing the characteristic features of the chiral transition in QCD at finite temperature T , we note the significance of the sigma-mesonic mode in the chiral transition : Sigma meson may be regarded as the “Higgs particle” in QCD, though the existence of such a mode in the real world is still unclear. We show the properties of the sigma meson in hot and/or hadronic matter, from which we ...
متن کاملExistence of Sigma Meson in Pi-pi Scattering *
In this talk I summarize a recently proposed mechanism to understand ππ scattering to 1 GeV. The model is motivated by the 1/NC expansion to QCD, and includes a current algebra contact term and resonant pole exchanges. Chiral symmetry plays an important role in restricting the form of the interactions. The existence of a broad low energy scalar (σ) is indicated.
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1996
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.76.1575