No abstract

The energy spectrum of the decay pions in T+ decay was obtained from a sample of 17 898 events. I t is found that the spectrum is adequately fitted by a squared matrix element of linear form, jMI2= l + a , X ( l b f~Q / m ,~) Y, with u7=0.131f 0.008. No evidence for C P noninvariance is found for T+ decays. A significant violation oi the 41= 4 rule is observed ior Kf -+ 37r decays Comparison with several theoretical models for K -+ 37r decays s11ou.s fair agreement betneen experiment and theory.

From a 98 000-photograph exposure of the BNL 80-in. deuterium-filled chamber to a 14.ti-GeV/c P beam we have extracted those events that fit the channelfic -D a -The cross section for this channel is measured to be 730 * 50 pb. The cross section f o r the reaction& -i%--(1238)p is determined to be 130 = 30 pb. Evidence for target dissociation is presented. A comparison with the reaction a-t~ .-71-p i~-at the same energy indicates agreement with factorization.

A significant violation of the AI=i rule has been detected in K*-+ Sir decay. The ratio of the coefficients of the linear terms in the squared matrix elements of T /+ (K +~* 7r + + 27T 0 ) and r + (K+~* 2TT + + TT~) is found to be -2.63 ±0.18 (as compared with the A/=i rule prediction of -2), when the results of the Riverside T ,+ experiment are used together with the results of the present T + experiment.

The branching ratios 7'+/(K+-+ all) and r'+/r+ were obtained from a sample of 12 976 K4 decays including 198 r'+ and 693 T+ decays. I t was found that r"/(Kf-+ all)=0.0153f 0.0011, and that T'+/T+ =0.286rt0.023. The r+/(K++ all) branching ratio and the rf energy spectrum in 7'' decay were also obtained, and were found to be in good agreement with the more precise determinations of the other experiments. The brqnching-ratio data suggest a small A1 =# admixture in the K -+ 3~ decay amplitudes. Comparison with various theoretical models sholvs fair to good agremeent between experiment and theory.