PHENOMENOLOGICAL ANALYSIS OF HYPERON DECAY
The DELTA 1 = 1/2 rule is incorporated into a previously discussed universal weak Yakawa interaction by assuming the simplest relation between chirality and charge operators. Expressing the DELTA I = 1/2 rule by forming the N and XI isospinors into an isovector B and an isoscalar B/sub 0/, it is assumed B occurs (as in beta decay) with g gamma /sub i1/2 (1 + r gamma 5) and B/sub 0/ (which has no beta -decay counterpart) with g gamma 1/2(1--r gamma 5). Here g is thie constant previously fitted to the pi decay rate, and r the ratio of Gamow-Teller and Fermi coupling constants. Depending on the sign taken between the B and B/sub 0/ interaction terms, SIGMA decays into n + pi /sup +/ in pure S and into n + pi /sup -/ in pure P channels, or vice versa. In either case, SIGMA /sup +/ yields p + pi /sup 0/ involves maximal S-P interference and alpha /sup 0/ = 0.98. Decay into I = 1/2 proceeds via gamma (1/2 + /2 r gamma 5) or gamma /sub i (3/2 + 1/2r gamma 5), depending on whether SIGMA / sup -/ decay is pure S or pure P. The second case, but not the first, leads to a LAMBDA -decay rate in agreement wiih experiment. In this case alpha /sub i = 0.54, and in XI /sup -/ decay, alpha /sub i = 0.64 and the calculated decay rate is 2.4 x 10/sup -10/ sec/sup -1/. (auth)
- Research Organization:
- Univ. of California, Berkeley
- NSA Number:
- NSA-14-000878
- OSTI ID:
- 4215197
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 115; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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