ar X iv : h ep - p h / 99 05 23 4 v 1 4 M ay 1 99 9 Multichannel Interaction Analysis of Scalar Mesons Below 1800 MeV
نویسنده
چکیده
Properties of scalar–isoscalar mesons in a mass range from ππ threshold up to 1800 MeV are analysed using an unitary model with separable interactions in three decay channels: ππ , KK and an effective 2π2π. Different solutions are obtained by fitting ππ and KK data. Analytical structure of the meson-meson multichannel amplitudes is studied with a special emphasis on the important role played by the S-matrix zeroes. The dependence of the positions of S-matrix singularities on the interchannel coupling strength is investigated. Poles, located in the complex energy plane not too far from the physical region, are interpreted as scalar resonances: a wide f0(500) , a narrow f0(980) and a relatively narrow f0(1400). In all our solutions two resonances, lying on different sheets, in the energy region between 1300 MeV and 1500 MeV are found. These states may be compared with the resonances f0(1370) and f0(1500) seen in the experiments at CERN. Total, elastic and inelastic channel cross sections, branching ratios and coupling constants are evaluated and compared with available data.
منابع مشابه
ar X iv : h ep - p h / 99 09 40 2 v 1 1 6 Se p 19 99 1 Properties of scalar – isoscalar mesons from multichannel interaction analysis below 1800 MeV
Scalar-isoscalar mesons are studied using an unitary model in three channels: ππ, KK and an effective 2π2π. All the solutions, fitted to the ππ and KK 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 rati...
متن کاملar X iv : h ep - p h / 94 05 25 5 v 1 9 M ay 1 99 4 6453 April , 1994 ( T / E ) Spin , Mass , and Symmetry
متن کامل
ar X iv : h ep - p h / 99 05 28 2 v 1 1 0 M ay 1 99 9 Comparing the Broken U 3 × U 3 Linear Sigma Model with Experiment
The linear σ model with broken U3×U3 is compared with data on the lightest scalar and pseudoscalar mesons. When 5 of the 6 parameters are fixed by the pseudoscalar masses and decay constants one finds that, already at the tree level, a reasonable description for the 4 scalar masses, mixing and up to 8 trilinear couplings of lightest scalars, taken as a0(980), f0(980), σ(≈ 500) and K 0 (1430). T...
متن کاملar X iv : h ep - p h / 98 05 30 4 v 1 1 3 M ay 1 99 8 Λ b → Λ c P ( V ) Nonleptonic Weak Decays
متن کامل
ar X iv : h ep - p h / 99 05 33 3 v 1 1 3 M ay 1 99 9 Ultra - High Energy Cosmic Rays and Stable H - dibaryon
It is shown that instanton induced interaction between quarks produces a very deeply bound H-dibaryon with mass below 2M N , M H = 1718 MeV. Therefore the H-dibaryon is predicted to be a stable particle. The reaction of photodisintegration of H-dibaryon to 2Λ in during of its penetration into cosmic microwave background will result in a new possible cutoff in the cosmic-ray spectrum. This provi...
متن کامل