New measurement of the CP violation parameter +-

J. N. Matthews, P. Gu, P. Haas, W. P. Hogan, S. K. Kim, S. S. Myung, S. Schnetzer, S. V. Somalwar, G. B. Thomson, Y. Zou, A. R. Barker, R. A. Briere, E. Cheu, D. A. Harris, G. Makoff, K. S. McFarland, A. Roodman, B. Schwingenheuer, Y. W. Wah, B. WinsteinR. Winston, E. C. Swallow, G. J. Bock, R. Coleman, M. Crisler, J. Enagonio, R. Ford, Y. B. Hsiung, D. A. Jensen, E. Ramberg, R. Tschirhart, T. Yamanaka, E. M. Collins, G. D. Gollin

Research output: Contribution to journalArticle

11 Scopus citations


We have measured the CP violation parameter +- in a neutral kaon experiment, E773, at Fermilab. This parameter characterizes CP violation in the decay KL+-. Kaon decays into +- collected simultaneously were used for normalization. Our result is |+-|=[2.359 0.062(stat)0.040(syst)]×10-3 with a phase +-=[43.8 3.5(stat)1.9(syst)]°. The prediction that +- should be very close to +- is supported by our result.

Original languageEnglish (US)
Pages (from-to)2803-2806
Number of pages4
JournalPhysical review letters
Issue number15
StatePublished - Jan 1 1995
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Matthews, J. N., Gu, P., Haas, P., Hogan, W. P., Kim, S. K., Myung, S. S., Schnetzer, S., Somalwar, S. V., Thomson, G. B., Zou, Y., Barker, A. R., Briere, R. A., Cheu, E., Harris, D. A., Makoff, G., McFarland, K. S., Roodman, A., Schwingenheuer, B., Wah, Y. W., ... Gollin, G. D. (1995). New measurement of the CP violation parameter +-. Physical review letters, 75(15), 2803-2806.