New measurement of the amplitude of the CP conserving decay K0S → π+ π- π0

Y. Zou, A. Beretvas, A. Caracappa, T. Devlin, H. T. Diehl, K. Krueger, S. S. Myung, S. Teige, G. B. Thomson, N. Grossman, K. Heller, K. Thorne, P. Border, M. J. Longo

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We measured the amplitude for the CP-symmetry-conserving decay K0S → π+ π- π0 in an experiment at Fermilab. This decay manifests itself as a time dependent charge asymmetry in the interference between the coherent KS and KL decays. We collected 1.1 million π+ π- π0 decays between 0.6 and 7.6 KS lifetimes from the production target using a detector that consisted of a magnetic spectrometer and a lead glass electromagnetic calorimeter. The ratio ρ+-0 of the CP-conserving KS amplitude to the KL amplitude is found to be: | p+-0 |= 0.039+0.009-0.006 (stat.) ±0.005 (syst.), with a phase φp = -9° ± 18°. This yields a branching ratio of (4.81+2.2-1.6 (stat.) ±1.1(syst.)) × 10-7.

Original languageEnglish (US)
Pages (from-to)362-366
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
StatePublished - Feb 29 1996


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