Measurements of KL branching fractions and the CP violation parameter |η+-|

T. Alexopoulos, M. Arenton, R. F. Barbosa, A. R. Barker, L. Bellantoni, A. Bellavance, E. Blucher, G. J. Bock, E. Cheu, S. Childress, R. Coleman, M. D. Corcoran, B. Cox, A. R. Erwin, R. Ford, A. Glazov, A. Golossanov, J. Graham, J. Hamm, K. HanagakiY. B. Hsiung, H. Huang, V. Jejer, D. A. Jensen, R. Kessler, H. G.E. Kobrak, K. Kotera, J. LaDue, A. Ledovskoy, P. L. McBride, E. Monnier, K. S. Nelson, H. Nguyen, R. Niclasen, V. Prasad, X. R. Qi, E. J. Ramberg, R. E. Ray, M. Ronquest, E. Santos, P. Shanahan, J. Shields, W. Slater, D. Smith, N. Solomey, E. C. Swallow, P. A. Toale, R. Tschirhart, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. Wilking, B. Winstein, R. Winston, E. T. Worcester, T. Yamanaka, E. D. Zimmerman

Research output: Contribution to journalArticlepeer-review

95 Scopus citations


We present new measurements of the six largest branching fractions of the KL using data collected in 1997 by the KTeV experiment (E832) at Fermilab. The results are B(KL → π±e ν) = 0.4067 ± 0.0011, B(KL → π±μν) = 0.2701 ± 0.0009, B(KL → π+π-π0) = 0.1252 ± 0.0007, B(KL → π0π 0π0) = 0.1945 ± 0.0018, B(KL → π+π-) = (1.975 ± 0.012) × 10 -3, and B(KL → π0π0) = (0.865 ± 0.010) × 10-3, where statistical and systematic errors have been summed in quadrature. We also determine the CP violation parameter |η+-| to be (2.228 ± 0.010) × 10 -3. Several of these results are not in good agreement with averages of previous measurements.

Original languageEnglish (US)
Article number092006
Pages (from-to)092006-1-092006-20
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number9
StatePublished - Nov 2004

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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