ON THE MASS SPECTRUM OF SIGMA MESONS
N. Fincinc, C. Potoceanu · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 1958
The method of constant arc was used to determine the masses of the following negative mesons, stopped in emulsion: 25 sigma mesons, producing stars with 1, 2, and 3 prongs, 19 sigma mesons producing stars with 4 and 5 prongs, and 13 pions producing pi /sup.-/ yields mu decays. Only two particles, sigma / sub 4/ and sigma /sub 5/, were found, whose masses gave values shifted toward 500 m/sub e/ within the limits of permissible errors. Both trajectories are short and the measurements of the gaps show that these particles are pions.