Phys. Rev. Lett. 76, 1575–1578 (1996)Confirmation of the Sigma MesonReceived 26 September 1995; published in the issue dated 4 March 1996 A very general model and an analysis of data on the lightest 0++ meson nonet shows that the f0(980) and f0(1300) resonance poles are two manifestations of the same ss̅ state. On the other hand, the uu̅ +dd̅ state, when unitarized and strongly distorted by hadronic mass shifts, becomes an extremely broad (880 MeV) and light (860 MeV) resonance, with its pole at s = 0.158-i0.235GeV2. This is the σ meson required by models for spontaneous breaking of chiral symmetry. It has been named the Higgs meson of QCD, because it generates most of the light hadron masses. It dominates ππ scattering below 900 MeV and it is also the resonance required by nuclear physics. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.1575
DOI:
10.1103/PhysRevLett.76.1575
PACS:
14.40.Cs, 12.39.Ki, 13.75.Lb
See AlsoComment: Nathan Isgur and Joseph Speth, Comment on “Confirmation of the Sigma Meson”, Phys. Rev. Lett. 77, 2332 (1996). Comment: Masayasu Harada, Francesco Sannino, and Joseph Schechter, Comment on “Confirmation of the Sigma Meson”, Phys. Rev. Lett. 78, 1603 (1997). Reply: Nils A. Törnqvist and Matts Roos, Törnqvist and Roos Reply:, Phys. Rev. Lett. 77, 2333 (1996). Reply: Nils Törnqvist and Matts Roos, Törnqvist and Roos reply:, Phys. Rev. Lett. 78, 1604 (1997). |
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