Properties of scalar--isoscalar mesons from multichannel interaction analysis below 1800 MeV

Details Properties of scalar--isoscalar mesons from multichannel interaction analysis below 1800 MeV Properties of scalar--isoscalar mesons from multichannel interaction analysis below 1800 MeV

1999-09-16

arxiv.org/abs/hep-ph/9909402v1

Nucl.Phys. A663 (2000) 625-628

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at XVth Particles and Nuclei Int. Conf. (PANIC99), Uppsala, Sweden, June 10-16, 1999; 4 pages, 3 figures, file espc

Scientific paper

10.1016/S0375-9474(99)00692-2

Scalar-isoscalar mesons are studied using an unitary model in three channels: pi-pi, K-anti K and an effective 2pi-2pi. All the solutions, fitted to the pi-pi and K-anti K data, exhibit a wide f0(500), a narrow f0(980) and two relatively narrow resonances, lying on different sheets between 1300 MeV and 1500 MeV. These latter states are similar to the f0(1370) and f0(1500) seen in experiments at CERN. Branching ratios are compared with available data. We have started investigations of some crossing symmetry and chiral constraints imposed near the pi-pi threshold on the scalar-isoscalar, scalar-isotensor and P-wave pi-pi amplitudes.

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