Search for CP violation in the decay KS0 → 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 performed an experiment at Fermilab to search for CP symmetry nonconservation in the decay KS0 → π+ π- π0. Todate CP violation has only been observed in KL0 decays. We collected π+ π- π0 decays between 0.6 and 7.6 KSlifetimesfrom the production target, and searched for interference between the coherent KS and KL decays. Our detector consisted of amagnetic spectrometer and a lead glass electromagnetic calorimeter. A double-beam, double-target method was used to controlsystematic uncertainties. KS0 → π+ π- decays that were collected simultaneously provided an important normalization. Theresult is Im(η+-0) = -0.015±0.017 (stat.) ± 0.025 (syst.) with the theoretical constraint Re(η+-0) = Re(ε{lunate}).

Original languageEnglish (US)
Pages (from-to)519-524
Number of pages6
JournalPhysics Letters B
Issue number4
StatePublished - Jun 23 1994

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    Zou, Y., Beretvas, A., Caracappa, A., Devlin, T., Diehl, H. T., Krueger, K., Myung, S. S., Teige, S., Thomson, G. B., Grossman, N., Heller, K., Thorne, K., Border, P., & Longo, M. J. (1994). Search for CP violation in the decay KS0 → π+π-π0. Physics Letters B, 329(4), 519-524.