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On the masses and modes of decay of heavy mesons produced by cosmic radiation - G-stack collaboration

par Davies, J.H. J.H.;Evans, David;Francois, P.E. P.E.;Friedlander, Michael M.W.;Hillier, R.;Iredale, P.;Keefe, D.;Menon, Mahesh G K;Perkins, D.H.;Powell, Carroll C.F.;Bøggild, J.;Brene, Niels;Fowler, P.H. P.H.;Hooper, J.;Ortel, W.C.G. W.C.G.;Scharff, M.;Crane, Lawrence Richard;Johnston, R.H.W. R.H.W.;O'Ceallaigh, C.;Anderson, F.;Lawlor, G.;Nevin, Thomas T.E.;Alvial, G.;Bonetti, A;Di Corato, M.;Dilworth, Constance ;Levi Setti, Riccardo;Milone, A.;Occhialini, Guiseppe ;Scarsi, Livio;Tomasini, G.;Ceccarelli, M.;Grilli, M.;Merlin, M.;Salandin, G.;Sechi, B.
Référence Il Nuovo cimento, 2, 5 Supplement, page (1063-1103)
Publication Publié, 1955-01

Article révisé par les pairs

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Résumé :

A large emulsion stack, exposed at high altitude, has been used to study the decaymodes of K-particles which produce a single charged secondary. The 5 decay modes, K μ, χ, κ{script} and τ′ have been recognized from the nature and energy of the charged secondary. The masses of the parent particles of the two-body decay modes, K μ and χ found from the mean range of the charged secondary are (976±7) me and (969±3) me respectively. Independent values derived from measurements of the scattering of the secondary track near the decay point are (954±17) me and (972±15) me respectively. The reliability of these mass values is discussed. An examination of the relative frequency of the decay modes in these experimental conditions indicates that the K μ -and χ-modes constitute respectively about 67 % and 20 % of all the K-particle decays: the Kβ, κ{script}- and τ′-modes being present to about 9 %, 3 %, and 1 % respectively. © 1955 Società Italiana di Fisica.