A STUDY OF THE K-PLUS LIFETIME AND THE LONGITUDINAL POLARIZATION OF THE MUON IN K-PLUS MUON-2 AND K-PLUS MUON-3 DECAY.
Technical rept. no. 36,
PRINCETON UNIV N J ELEMENTARY PARTICLES LAB
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In a counter experiment at the Princeton-Penn Accelerator, a precise measurement was made of the K-plus lifetime and the lifetime of the K-plus muon-2 decay mode. The longitudinal polarization of the muon in K-plus muon-2 decay and at two values of the muon energy in K-plus muon-3 decay was also measured. Lifetime data was analyzed with a view toward checking for deviations from a pure exponential decay law. No evidence was found for such deviations. The longitudinal polarization of the muon in K-plus muon-2 decay was found to be -1.01 0.12. For the longitudinal polarization of the muon in K-plus muon-3 decay, we found P0.7 0.6 at a muon energy of 191 4 Mev and P -0.6 0.7 at 231 4 Mev. These data, taken together with other recent measurements of this polarization, are consistent with the constant form factor theory with Zeta 0.5 and with a partially conserved strangeness changing vector current theory. Author