Science Record

SCIENCE RECORD New Ser. Vol. Il, No. 1, 1959

PHYSICS

THE MEAN LIFE TIME RATIO OF K*-MESON AND HYPERONS AND THEIR BRANCHING RATIOS OF DIFFERENT DECAY MODES*

W. T. Les*¥* (483c4#), D. C. Sen (eH), T. H. Ho (ARTETR) J. M. Cen ( BRRzB), anv H. Y, Tzu (HTC)

(Institute of Atomic Energy Research, Academia Sinica)

The theory of the universal Fermi interaction proposed independently by Feynman and Gell-Mann" on the one hand and Sudarshan and Marshak”! on the other has been successfully applied to explain the B-decay and many other phenomena caused by weak interactions. It will be interesting to apply the theory to the discussion of other phenomena inyolving weak interactions.

In this note, the mean life time ratio of K*-meson and hyperons and the branching ratios of some of the different decay modes of K*-meson and hyperons are calculated by using the Feynman—Gell-Mann universal interaction. These decay processes are the following: .

Kt pt + w+, Kt—> p* +», Kt et + +, M—>p* + 2, (1) N—yn + 7°, pe tee Lt— Jn + 1, ys —n +7 ,=5 B-—y M9 + x-,

The universal Fermi weak interaction has the following form:

Hy = Fea + ¥s)B)(Cy,C1 + ¥5)D), (2)

where A, B, C, D represent the field operators of various Fermt particles, which can be N, A, 3, 2, p, v, ¢ etc. in this note. # and ¢ are each chosen as unit and equal to 1. G is a universal constant, whose value is given by

the following equation: Gmy = (1.01 + 0.01) X 107, (3)

my being the mass of the nucleon.

*Received Dec. 10, 1958. **Now at the Chekiang University,