@article{32553006d4874b0fa1a000b332a661c0,
title = "Measurement of the Branching Ratio and Form Factor of KL→μ+μ-γ",
abstract = "We report on the analysis of the rare decay KL→μ+μ-γ the 1997 data from the KTeV experiment at Fermilab. A total of 9327 candidate events are observed with 2.4% background, representing a factor of 40 increase in statistics over the current world sample. We find that B(KL→μ+μ-γ)=(3.62±0.04stat±0.08syst)×10-7. The form factor parameter αK* is measured to be αK*=-0.160-0.028+0.026. In addition, we make the first measurement of the parameter α from the D{\textquoteright}Ambrosio-Isidori-Portol{\'e}s form factor, finding α=-1.54±0.10. In that model, this α measurement limits the Cabibbo-Kobayashi-Maskawa parameter ρ>-0.2.",
author = "{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 = aug,
day = "13",
doi = "10.1103/PhysRevLett.87.071801",
language = "English (US)",
volume = "87",
pages = "71801--1--71801--4",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "7",
}