We have studied the proper time distribution of coherent π + π − decays from a 3 – 10 GeV/ c K L o beam incident on a one meter liquid hydrogen target using a wire spark chamber spectrometer in the 3 0 neutral beam at SLAC. We find ∣(ƒ(0) − ƒ (0))/k∣ = 0.43 ± 0.11 mb , φ(ƒ(0) − ƒ (0)) = -101 0 ± 42 0 .
FULL T REGION.
FULL T REGION.
The reaction π−+p→Λ+K0 in the 72-in. hydrogen chamber was used to produce 7220 K0 mesons associated with a visible decay Λ→p+π−. The time dependence and absolute yield of the subsequent strong interactions of K0 and K0 in hydrogen were used to determine all the parameters of the neutral K system, without the assumption of CPT invariance or other assumptions about the weak interactions of neutral K's. From the time distribution of 59 events of the type K¯0+p→hyperon, we find the magnitude of the KS0−KL0 mass difference. We then determine the mixing parameters p, q, p′, q′ of the neutral K system by means of the time dependence and absolute yield of 11 charge-exchange events, K0+p→K++n, and the absolute yield of 49 two-body interactions, K¯0+p→hyperon+pion. The results are consistent with CPT invariance and with values of the mixing parameters determined by means of weak interactions. We find the Biswas ratio R≡σ(KLp→KSp)σ(KLp→hyperon) to be R=0.41±0.13 averaged over KL momenta from about 200 to 600 MeVc. This agrees with solution I of Kim and with the results of Kadyk et al. Our absolute yields for K¯0+p→hyperon+pion are in good agreement with the predictions of charge independence and the measured rates for K−+p→hyperon+pion. For the front-back asymmetry of the Λ in K¯0+p→Λ+π+, we find (F−B)(F+B)=−0.48±0.18, indicating that the P wave cannot be neglected relative to the S wave in our momentum range.
TOTAL NUMBER EVENTS=22.
TOTAL NUMBER EVENTS=18.
TOTAL NUMBER EVENTS=9.
STATISTICAL ERRORS ONLY. CROSS SECTIONS ARE NORMALIZED RELATIVE TO THE PI+ LAMBDA EVENTS - SEE THE RECORD OF L. BERTANZA ET AL., NP B110, 1 (1976).
KL --> 3PI USED TO MEASURE ABSOLUTE CROSS SECTIONS AT 530 MEV/C.
SYSTEMATIC ERRORS INCLUDED.
ROUGH FIT - POSSIBLY OTHER SYSTEMATIC ERRORS.
FORWARD CROSS SECTION AND OPTICAL THEOREM USED TO DETERMINE PHASE OF FORWARD AMPLITUDE. RE(AMP)/IM(AMP) IS REAL(AMP)/IMAG(AMP).
FORWARD CROSS SECTION, AMPLITUDE AND PHASE FOR K0 REGENERATION.
(AK0 - K0) TOTAL CROSS SECTION DIFFERENCES.
THE AVERAGE PHASE IS -130.9 +- 2.7 DEG (NO EXPLICIT MOMENTUM DEPENDENCE). USING ABS(ETA+-) = 2.3*10**-3.
REGENERATION AMPLITUDE ASSUMING MOMENTUM INDEPENDENT CONSTANT PHASE.
CROSS SECTION DIFFERENCES ASSUMING MOMENTUM INDEPENDENT CONSTANT PHASE.
RESULTS USING ETA+- = 2.15E-3.
RESULTS USING ETA+- = 2.27E-3.
We present experimental data on the K L 0 p → K S 0 p reaction between 4 and 14 GeV/ c in the range 0.1 ≲ | t | ≲ 2 GeV 2 . This experiment has been performed at the CERN PS, using spark chambers and a large aperture magnet. The results show a break of slope at t = −0.3 GeV 2 . The ω trajectory deduced from the data has an intercept α (0) = 0.5 and a slope α ′ = 0.88. A comparison with various models shows that the non-flip amplitude is dominant.
THE REGENERATION AMPLITUDE DECREASES OVER THIS ENERGY RANGE.
NOTE PHASE IS HERE DEFINED AS THE PHASE OF I*AMP(NAME=REGEN) AND SO DIFFERS BY 90 DEG FROM USUAL DEFINITION.
TABLE ALSO CALCULATES FORWARD DIFFERENTIAL CROSS SECTION AND SIG(AK0 P) - SIG(K0 P) TOTAL CROSS SECTION DIFFERENCES.