First Observation of the Decay KL → π0e+e-γ

The KTeV Collaboration

Research output: Contribution to journalArticle

Abstract

We report on the first observation of the decay KL→π0e+e-γ by the KTeV E799 experiment at Fermilab. Based upon a sample of 48 events with an estimated background of 3.6±1.1 events, we measure the KL→π0e+e-γ branching ratio to be (2.34±0.35±0.13)×10−8. Our data agree with recent O(p6) calculations in chiral perturbation theory that include contributions from vector meson exchange through the parameter aV. A fit was made to the KL→π0e+e-γ data for aV with the result −0.67±0.21±0.12, which is consistent with previous results from KTeV.

Original languageEnglish (US)
JournalPhysical Review Letters
Volume87
Issue number2
DOIs
StatePublished - Jun 25 2001

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decay
vector mesons
perturbation theory

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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First Observation of the Decay KL → π0e+e-γ. / The KTeV Collaboration.

In: Physical Review Letters, Vol. 87, No. 2, 25.06.2001.

Research output: Contribution to journalArticle

The KTeV Collaboration. / First Observation of the Decay KL → π0e+e-γ. In: Physical Review Letters. 2001 ; Vol. 87, No. 2.
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title = "First Observation of the Decay KL → π0e+e-γ",
abstract = "We report on the first observation of the decay KL→π0e+e-γ by the KTeV E799 experiment at Fermilab. Based upon a sample of 48 events with an estimated background of 3.6±1.1 events, we measure the KL→π0e+e-γ branching ratio to be (2.34±0.35±0.13)×10−8. Our data agree with recent O(p6) calculations in chiral perturbation theory that include contributions from vector meson exchange through the parameter aV. A fit was made to the KL→π0e+e-γ data for aV with the result −0.67±0.21±0.12, which is consistent with previous results from KTeV.",
author = "{The KTeV Collaboration} and A. Alavi-Harati and T. Alexopoulos and M. Arenton and K. Arisaka and S. Averitte and Barker, {A. R.} and L. Bellantoni and A. Bellavance and J. Belz and R. Ben-David and Bergman, {D. R.} and E. Blucher and Bock, {G. J.} and C. Bown and S. Bright and Cheu, {Elliott C} and S. Childress and R. Coleman and Corcoran, {M. D.} and G. Corti and B. Cox and Crisler, {M. B.} and Erwin, {A. R.} and R. Ford and A. Glazov and A. Golossanov and G. Graham and J. Graham and K. Hagan and E. Halkiadakis and J. Hamm and K. Hanagaki and S. Hidaka and Hsiung, {Y. B.} and V. Jejer and Jensen, {D. A.} and R. Kessler and Kobrak, {H. G.E.} and J. LaDue and A. Lath and A. Ledovskoy and McBride, {P. L.} and P. Mikelsons and E. Monnier and T. Nakaya and Nelson, {K. S.} and H. Nguyen and V. O’dell and M. Pang and R. Pordes",
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AU - Barker, A. R.

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AU - Bellavance, A.

AU - Belz, J.

AU - Ben-David, R.

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AU - Blucher, E.

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AU - Coleman, R.

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AU - Crisler, M. B.

AU - Erwin, A. R.

AU - Ford, R.

AU - Glazov, A.

AU - Golossanov, A.

AU - Graham, G.

AU - Graham, J.

AU - Hagan, K.

AU - Halkiadakis, E.

AU - Hamm, J.

AU - Hanagaki, K.

AU - Hidaka, S.

AU - Hsiung, Y. B.

AU - Jejer, V.

AU - Jensen, D. A.

AU - Kessler, R.

AU - Kobrak, H. G.E.

AU - LaDue, J.

AU - Lath, A.

AU - Ledovskoy, A.

AU - McBride, P. L.

AU - Mikelsons, P.

AU - Monnier, E.

AU - Nakaya, T.

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AU - O’dell, V.

AU - Pang, M.

AU - Pordes, R.

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N2 - We report on the first observation of the decay KL→π0e+e-γ by the KTeV E799 experiment at Fermilab. Based upon a sample of 48 events with an estimated background of 3.6±1.1 events, we measure the KL→π0e+e-γ branching ratio to be (2.34±0.35±0.13)×10−8. Our data agree with recent O(p6) calculations in chiral perturbation theory that include contributions from vector meson exchange through the parameter aV. A fit was made to the KL→π0e+e-γ data for aV with the result −0.67±0.21±0.12, which is consistent with previous results from KTeV.

AB - We report on the first observation of the decay KL→π0e+e-γ by the KTeV E799 experiment at Fermilab. Based upon a sample of 48 events with an estimated background of 3.6±1.1 events, we measure the KL→π0e+e-γ branching ratio to be (2.34±0.35±0.13)×10−8. Our data agree with recent O(p6) calculations in chiral perturbation theory that include contributions from vector meson exchange through the parameter aV. A fit was made to the KL→π0e+e-γ data for aV with the result −0.67±0.21±0.12, which is consistent with previous results from KTeV.

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