Phys. Rev. Lett.
88,
041803
(2002)
[4 pages]
Further Evidence for the Decay K+→π+νν̅
S. Adler et al. (E787 Collaboration)
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S. Adler1, A. O. Bazarko2, P. C. Bergbusch3, E. W. Blackmore4, D. A. Bryman3, S. Chen4, I-H. Chiang1, M. V. Diwan1, J. S. Frank1, J. S. Haggerty1, J. Hu4, T. Inagaki5, M. Ito2,*, V. Jain1, S. Kabe5, S. H. Kettell1, P. Kitching6, M. Kobayashi5, T. K. Komatsubara5, A. Konaka4, Y. Kuno5,†, M. Kuriki5, K. K. Li1, L. S. Littenberg1, J. A. Macdonald4, P. D. Meyers2, J. Mildenberger4, M. Miyajima7, N. Muramatsu5,‡, T. Nakano8, C. Ng1,§, S. Ng6, T. Numao4, J.-M. Poutissou4, R. Poutissou4, G. Redlinger4,**, T. Sato5, K. Shimada7, T. Shimoyama7, T. Shinkawa5,††, F. C. Shoemaker2, J. R. Stone2, R. C. Strand1, S. Sugimoto5, Y. Tamagawa7, C. Witzig1, and Y. Yoshimura5 (E787 Collaboration)
1Brookhaven National Laboratory, Upton, New York 11973 2Joseph Henry Laboratories, Princeton University, Princeton, New Jersey 08544 3Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada, V6T 1Z1 4TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada, V6T 2A3 5High Energy Accelerator Research Organization (KEK), Oho, Tsukuba, Ibaraki 305-0801, Japan 6Centre for Subatomic Research, University of Alberta, Edmonton, Canada, T6G 2N5 7Department of Applied Physics, Fukui University, 3-9-1 Bunkyo, Fukui, Fukui 910-8507, Japan 8Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
Received 2 November 2001; published 11 January 2002
Additional evidence for the rare kaon decay K+→π+νν̅ has been found in a new data set with comparable sensitivity to the previously reported result. One new event was observed in the pion momentum region examined, 211<P<229MeV/c, bringing the total for the combined data set to two. Including all data taken, the backgrounds were estimated to contribute 0.15±0.05 events. The branching ratio is B(K+→π+νν̅ ) = 1.57-0.82+1.75×10-10.
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.041803
DOI:
10.1103/PhysRevLett.88.041803
PACS:
13.20.Eb, 12.15.Hh, 14.80.Mz
*Present address: Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606. †Present address: Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan. ‡Present address: Japan Atomic Energy Research Institute, Sayo, Hyogo 679-5198, Japan. §Also at Physics Department, State University of New York at Stony Brook, Stony Brook, New York 11794-3800. **Present address: Brookhaven National Laboratory, Upton, New York 11973. ††Present address: National Defense Academy of Japan, Yokosuka, Kanagawa 239-8686, Japan.
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