Open Access
Eur. Phys. J. C
Volume 12, Number 4, February 2000
Page(s) 627 - 631
Published online 27 January 2000
Eur. Phys. J. C 12, 627-631
DOI 10.1007/s100520000291

A kinematically complete measurement of $K^+ \to \pi^+ \pi^0 \pi^0$ decays

The KEK-PS E246 Collaboration

Y.-H. Shin1 - M. Abe2 - M. Aoki3 - I. Arai4 - Y. Asano2 - T. Baker3,5 - M. Blecher6 - M.D. Chapman3 - D. Dementyev7 - P. Depommier8 - M. Grigorjev7 - P. Gumplinger9 - M. Hasinoff10 - R. Henderson9 - K. Horie4,16 - W.S. Hou11 - H.C. Huang11 - Y. Igarashi3,4 - T. Ikeda4,17 - A. Ivashkin7 - J. Imazato3 - J-M. Lee1 - K.S. Lee12 - G.Y. Lim3 - J.H. Kang1 - W. Keil9 - M. Khabibullin7 - A. Khotjantsev7 - Y. Kudenko7 - Y. Kuno3 - J.A. Macdonald9 - C.R. Mindas13 - O. Mineev7 - C. Rangacharyulu5 - S.K. Sahu11 - S. Sekikawa4 - H.M. Shimizu3,17 - S. Shimizu14,16 - K. Shibata4 - Y.M. Shin5 - K.S. Sim12 - A. Suzuki4 - T. Tashiro4 - A. Watanabe4 - D. Wright9 - T. Yokoi15

1Department of Physics, Yonsei University, Seoul 120-749, Korea
2 Institute of Applied Physics, University of Tsukuba, Ibaraki 305-0006, Japan
3 IPNS, High Energy Accelerator Research Organization (KEK), Ibaraki 305-0801, Japan
4 Institute of Physics, University of Tsukuba, Ibaraki 305-0006, Japan
5 Department of Physics, University of Saskatchewan, Saskatoon SK S7N 5E2, Canada
6 Department of Physics, Virginia Polytechnic Institute and State University, VA 24061-0435, USA
7 Institute for Nuclear Research, Russian Academy of Sciences, Moscow 117312, Russia
8 Laboratoire de Physique Nucleaire, University de Montreal, Montreal H3C 3J7, Canada
9 TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
10 Department of Physics and Astronomy, University of British Columbia, Vancouver V6T 1Z1, Canada
11 Department of Physics, National Taiwan University, Taipei 106, Taiwan
12 Department of Physics, Korea University, Seoul 136-701, Korea
13 Department of Physics, Princeton University, NJ 08544, USA
14 Department of Applied Physics, Tokyo Institute for Technology, Tokyo 152-0033, Japan
15 Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
16 Department of Physics, Osaka university, Osaka 560-0043, Japan
17 RIKEN, 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan

Received: 16 October 1999 / Published online: 27 January 2000 - © Springer-Verlag 2000 2000

In a kinematically complete setting, the $K^+ \to \pi^+ \pi^0 \pi^0$decays of stopped K+ were measured. In the frame work of the Weinberg polynomial expansion, the coefficients up to quadratic terms were deduced. The results are in good agreement with previous measurements and consistent with CP conservation expectations. The empirical $\Delta I=1/2$ rule is violated.

Copyright Springer-Verlag 2000

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