@article{3c247d7064694d1398f53e5e1ca98543,
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 E. Cheu 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{\textquoteright}dell and M. Pang and R. Pordes",
year = "2001",
month = jun,
day = "25",
doi = "10.1103/PhysRevLett.87.021801",
language = "English (US)",
volume = "87",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "2",
}