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APS » Journals » Phys. Rev. Lett. » Volume 60 » Issue 17
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Phys. Rev. Lett. 60, 1695–1698 (1988)

First result on a new measurement of ε’/ε in the neutral-kaon system

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M. Woods, K. Nishikawa, J. R. Patterson, Y. W. Wah, B. Winstein, R. Winston, and H. Yamamoto
The Enrico Fermi Institute and the Department of Physics, The University of Chicago, Chicago, Illinois 60637

E. C. Swallow
Department of Physics, Elmhurst College, Elmhurst, Illinois 60126
The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637

G. J. Bock, R. Coleman, Y. B. Hsiung, K. Stanfield, R. Stefanski, and T. Yamanaka
Fermi National Accelerator Laboratory, Batavia, Illinois 60510

G. D. Gollin, G. L. Grazer, and J. K. Okamitsu
Department of Physics, Princeton University, Princeton, New Jersey 08544

P. Jarry, R. Daudin, P. Debu, B. Peyaud, and R. Turlay
Département de Physique des Particules Elémentaires, Centre d’Etudes Nucléaires de Saclay, F-91191 Gif-sur-Yvette Cedex, France

Received 8 February 1988; published in the issue dated 25 April 1988

A new beam line and detector were constructed to increase statistical precision and greatly reduce systematic uncertainty on the ratio of the CP-nonconserving parameters ε’/ε. Major improve- ments are discussed together with a result from a first run: ε’/ε=0.0032±0.0028 (statistical) ±0.0012 (systematic). The precision is better than earlier measurements yet the result is still consistent with the superweak mechanism (which predicts zero) and that due to Kobayashi and Maskawa. Significantly more data are being collected.

© 1988 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.60.1695
DOI:
10.1103/PhysRevLett.60.1695
PACS:
13.25.+m, 11.30.Er, 14.40.Aq
 
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