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 journalArticle

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Abstract

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
Volume70
Issue number9
DOIs
StatePublished - Nov 1 2004

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    Alexopoulos, T., Arenton, M., Barbosa, R. F., Barker, A. R., Bellantoni, L., Bellavance, A., Blucher, E., Bock, G. J., Cheu, E., Childress, S., Coleman, R., Corcoran, M. D., Cox, B., Erwin, A. R., Ford, R., Glazov, A., Golossanov, A., Graham, J., Hamm, J., ... Zimmerman, E. D. (2004). Measurements of KL branching fractions and the CP violation parameter |η+-|. Physical Review D - Particles, Fields, Gravitation and Cosmology, 70(9), 092006-1-092006-20. [092006]. https://doi.org/10.1103/PhysRevD.70.092006