@article{9e9a9c2dd0d9447b9f59e9a7dab2919a,
title = "Measurement of the Branching Fraction of the Decay KL→π+π−e+e−",
abstract = "We report the first branching fraction measurement of the decay KL→π+π−e+e−.With a sample of 46 candidates, and an expected background level of 9.4 events, the branching fraction is determined to be B(KL→π+π−e+e−) = [3.2±0.6(stat)±0.4(syst)]×10−7.This measurement was carried out as part of the Fermilab KTeV (E799-II) experiment and is in good agreement with the expectations from the mechanisms of direct emission and inner bremsstrahlung.",
author = "{KTeV Collaboration} and J. Adams and A. Alavi-Harati and Albuquerque, {I. F.} 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 G. Graham and J. Graham and Hagan, {K. A.} and E. Halkiadakis and K. Hanagaki and M. Hazumi and S. Hidaka and Hsiung, {Y. B.} and V. Jejer and J. Jennings and Jensen, {D. A.} and Johnson, {P. T.} and R. Kessler and Kobrak, {H. G.E.} and J. LaDue and A. Lath and A. Ledovskoy and McManus, {A. P.} and P. Mikelsons and E. Monnier and T. Nakaya and U. Nauenberg and Nelson, {K. S.} and H. Nguyen",
year = "1998",
doi = "10.1103/PhysRevLett.80.4123",
language = "English (US)",
volume = "80",
pages = "4123--4126",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "19",
}