@article{6e2bfc15f4e94a079bc60f4924492f5f,
title = "Observation of direct CP violation in ks, l→ΠΠ decays",
abstract = "We have compared the decay rates of KL and KS toΠ+ Π- Π0Π0 final states using a subset of the data from the KTeV experiment (E832) at Fermilab. We find that the direct-CP-violation parameter Re (μ{\textquoteright}/μ) is equal to [28.0±3.0(stat)±2.8(syst)]×10-4. This result definitively establishes the existence of CP violation in a decay process.",
author = "{KTeV Collaboration} 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 {Ben David}, R. 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 K. Hanagaki and S. Hidaka and Hsiung, {Y. B.} and V. Jejer and J. Jennings and Jensen, {D. A.} and R. Kessler and Kobrak, {H. G.E.} and {La Due}, J. and A. Lath and A. Ledovskoy and {Mc Bride}, {P. L.} and {Mc Manus}, {A. P.} and P. Mikelsons and E. Monnier and T. Nakaya and U. Nauenberg and Nelson, {K. S.} and H. Nguyen",
year = "1999",
doi = "10.1103/PhysRevLett.83.22",
language = "English (US)",
volume = "83",
pages = "22--27",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "1",
}