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DAVIES 1955

G-Stack collaboration; Davies, J.H. et al.
On the Masses and Modes of Decay of Heavy Mesons Produced by Cosmic Radiation
Nuovo Cim. 2 (1955) 1063;

Summary
A large emulsion stack, exposed at high altitude, has been used to study the decay-modes of K-particles which produce a single charged secondary. The 5 decay modes, K_μ, χ, κ>, K_β 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) m_e and (969 ± 3) m_e respectively. Independent values derived from measurements of the scattering of the secondary track near the decay point are (954 ± 17) and (972 ± 3) m_e 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 K_β, κ> and τ' modes being present to about 9%, 3% and 1% respectively.

Accelerator COSM Detectors EMUL

Related references
See also
K. Gottstein et al., Phil. Mag. 42 (1951) 708;
W. F. Fry, G. R. White, Phys. Rev. 90 (1953) 207;
O. Heinz, Phys. Rev. 94 (1954) 1728;
W. H. Barkas and L. Yong, Phys. Rev. 98 (1955) 605;
F. Anderson, G. Lawlor, and T. E. Nevin, Nuovo Cim. 2 (1955) 608;
L. Voyvodic and E. Pickup, Phys. Rev. 85 (1952) 91;
F. M. Smith, W. Birnbaum, and W. H. Barkas, Phys. Rev. 91 (1953) 765;
G. Baroni et al., preprint CERN BS/9 (1954);
R. H. Dalitz, Proc. of the Rochester Conf. (1955);
R. W. Birge et al., Mimeografed report of the Piza Conference (1955) 151;
S. C. Fung, N. Mohler, A. Pevsner, and D. Ritson, Mimeografed report of the Piza Conference (1955) 201;
G. Puppi, Nuovo Cim. Suppl. 11 (1954) 438;
Analyse data from
R. H. W. Johnston and C. O'Ceallaigh, Phil. Mag. 46 (1955) 393;
C. Dahanayake, P. E. Francois, and Y. Fujimoto, Phil. Mag. 45 (1954) 1219;
M. W. Friedlander, D. Keefe, M. G. K. Menon, and I. van Rossum, Phil. Mag. 45 (1954) 1043;
J. Cruesard, M. F. Kaplon, J. Klarmann, and J. H. Noon, Phys. Rev. 93 (1954) 253;
A. Pais, Phys. Rev. 86 (1952) 663;
R. H. Dalitz, Proc. Roy. Soc. 66 (1953) 710;
R. Armenteros et al., Nuovo Cim. 1 (1955) 915;
B. P. Gregory et al., Nuovo Cim. 11 (1954) 292;
A. L. Hodson et al., Phys. Rev. 96 (1954) 1089;
M. Baldo et al., Nuovo Cim. 1 (1955) 1180;
H. S. Bridge et al., Nuovo Cim. 1 (1955) 874;
M. G. K. Menon and C. O'Ceallaigh, Proc. Roy. Soc. A221 (1954) 292;
R. H. Brown et al., Nature 163 (1949) 82;
C. O'Ceallaigh, Phil. Mag. 42 (1951) 1032;

Reactions

	K+ π+ πo
	K– μ– ν
	K+ μ+ ν
	K+ π+ 2πo
	K– πo π–
	K+ e+ 2neutral
	K– e– 2neutral
	K+ μ+ 2neutral
	K– μ– 2neutral

Particles studied

	K+	mass, pw
	K–	mass, pw

Record comments
Measurements of charged kaon decay branching fractions.

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