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ALVAREZ 1955

Alvarez, L.W.; Goldhaber, S.;
The Lifetime of the τ-Meson
Nuovo Cim. 2 (1955) 344;

Motivation
Now that K-mesons are available in large numbers from proton synchrotrons, experiments will soon yield precise values for the lifetime, or lifetimes, of the K-mesons. Exposures of emulsions to K-particles have been made by several groups at Berkeley, under quite different conditions, so far as distance from the target and magnetic resolution are concerned. If one knew the relative integrated currents on the targets for exposures with long and short flight paths, and if geometrical and resolution factors were properly taken into account, these experiments would yield a lifetime. Until recently, such an intercomparison of the results of the various experiments has appeared impossible. A method has now been found to tie the results of the various experiments together; this note describes the method and presents the lifetime so determined. (Extracted from the introductory part of the paper.).

Accelerator LBL Detectors EMUL

Related references
Analyse data from
H. H. Heckman, G. Goldhaber, and F. M. Smith, Bull.Am.Phys.Soc. 30 (1955) 63;
W. W. Chupp et al., preprint UCRL-3031 (1955);
R. W. Birge et al., preprint UCRL-3009 (1955);
L. T. Kerth et al., Bull.Am.Phys.Soc. 30 (1955) 41;

Data comments
10 τ-decay events without magnetic field and 60 with magnetic field.

Reactions

K+ 2π+ π–

Particles studied

K+

w

Record comments
First measurement of the K⁺ lifetime. First evidence for the equality of lifetimes of the Θ and τ mesons.

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