Existence of the σ\sigma-meson below 1 GeV and f0(1500)f_0(1500) glueball

On the basis of a simultaneous description of the isoscalar s-wave channel of the $\pi\pi$ scattering (from the threshold up to 1.9 GeV) and of the $\pi\pi\to K\bar{K}$ process (from the threshold to $\sim$ 1.4 GeV) in the model-independent approach, a confirmation of the $\sigma$-meson at $\sim$ 665 MeV and an indication for the glueball nature of the $f_0(1500)$ state are obtained. It is shown that the large $\pi\pi$-background, usually obtained, combines, in reality, the influence of the left-hand branch-point and the contribution of a very wide resonance at $\sim$ 665 MeV. The coupling constants of the observed states with the $\pi\pi$ and $K\bar{K}$ systems and lengths of the $\pi\pi$ and $K\bar{K}$ scattering are obtained.Comment: 13 pages, 3 figures, LaTex; submitted to Physics Letters

Analyse de données expérimentales concernant la diffusion pion-pion

info:eu-repo/semantics/publishe

Etude de la diffusion elastique π-πO par la methode d'extrapolation de chew et low a partir de la reaction π-p → π-πOp A 2.77 GeV/c

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

The fragmentation of sup 28 Si

The fragmentation of {sup 28}Si in targets of C, CH{sub 2}, Cu and Pb has been investigated at the Lawrence Berkeley Laboratory Bevalac. Total charge changing cross sections, {sigma}{sub {Delta}z}, for these targets and for H (CH{sub 2}-C subtraction) were measured at 375, 550 and 1050 MeV/nucleon. The results are compared to previous data, to model calculations and to values used in cosmic ray propagation calculations. 10 refs., 3 figs

Cross sections for charged current ν and {Mathematical expression} interactions in the energy range 10 to 50 GeV

Charged-current neutrino and antineutrino interaction cross sections have been measured in the energy range 10 to 50 GeV using BEBC filled with a neon-hydrogen mixture. At these energies, σ/E was measured to be (0.73±0.08) 10 -38 cm 2/GeV per nucleon for neutrinos and (0.32±0.06) 10 -38 cm 2/GeV per nucleon for antineutrinos. © 1979 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe