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

doi:10.1016/0370-2693(94)91098-7

Search for CP violation in the decay K_S⁰ → 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

Physics and Astronomy (Twin Cities)

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Abstract

We performed an experiment at Fermilab to search for CP symmetry nonconservation in the decay K_S⁰ → π⁺ π^- π⁰. Todate CP violation has only been observed in K_L⁰ decays. We collected π⁺ π^- π⁰ decays between 0.6 and 7.6 K_Slifetimesfrom the production target, and searched for interference between the coherent K_S and K_L decays. Our detector consisted of amagnetic spectrometer and a lead glass electromagnetic calorimeter. A double-beam, double-target method was used to controlsystematic uncertainties. K_S⁰ → 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 language	English (US)
Pages (from-to)	519-524
Number of pages	6
Journal	Physics Letters B
Volume	329
Issue number	4
DOIs	https://doi.org/10.1016/0370-2693(94)91098-7
State	Published - 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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@article{d1e8edf6034b4d74b4ed3ffa10f67ff8,

title = "Search for CP violation in the decay KS0 → π+π-π0",

abstract = "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}).",

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

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.",

year = "1994",

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doi = "10.1016/0370-2693(94)91098-7",

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T1 - Search for CP violation in the decay KS0 → π+π-π0

AU - Zou, Y.

AU - Beretvas, A.

AU - Caracappa, A.

AU - Devlin, T.

AU - Diehl, H. T.

AU - Krueger, K.

AU - Myung, S. S.

AU - Teige, S.

AU - Thomson, G. B.

AU - Grossman, N.

AU - Heller, K.

AU - Thorne, K.

AU - Border, P.

AU - Longo, M. J.

N1 - 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.

PY - 1994/6/23

Y1 - 1994/6/23

N2 - 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}).

AB - 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}).

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