A mix of particles starts with equal numbers of the three types of sigma particles listed in Table 39.1. Find the relative portion of each after(a) 5x10^-20?s ?(b) 5x10^-10 s. Give your answer in a reference frame in which the particles are at rest.?

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Table 39.1 Selected Particles Symbol (Partide/ Antipartide) Category/Particde Field particles Photon Spin Mass (MeVic?) Baryon Number, B Lepton Number, L Strangeness, s Lifetime (s) Stable Y. Y Z°, Z° 91,188 -10-23 Leptons Electron 0.511 +1 Stable Muon 105.7 +1 2.2x106 Tau 1777 +1 2.9x10-13 Electron neutrino <3x10 <0.19 <18.2 +1 Stable Muon neutrino +1 Stable Tau neutrino +1 Stable Hadrons Mesons 139.6 2.6x 10* Pion Pion 135.0 8.4x 10-17 -5x 10-19 -4x10-24 1.2x10 Eta 547.8 Rho p°, pl 775.8 Каon K*, K 493.7 Каon K°, K® 497.6 0.895x 10-10 5.18x 10-8 Baryons Proton P.P 938.3 1 Stable Neutron n, A 939.6 885.7 Lambda A°. T 1115.7 1 2.6x 10 10 0.80x 10-10 7.4x 10-20 -1 Sigma 1189.4 -1 Sigma 1192.6 1 -1 Sigma Σ. Σ 1197.4 -1 1.5x10-10 Omega 1672.45 -3 0.82x 10-10 • o o o - -