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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14 Scopus citations


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

Bibliographical note

Funding Information:
E. Overseth, A. Pal, M. Sheaff, and M. Shupe in the early stages of the experiment; L. Pondrom for the loan of the MWPC system; and the staffs of the Fermilab Experimental Areas and Computing Departments for assistance at all stages. This work was supported in part by the National Science Foundation and the U.S. Department of Energy.


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