Phys. Rev. D
72,
091102(R)
(2005)
[4 pages]
Upper limit on the branching ratio for the decay π0→νν̅
A. V. Artamonov et al. E949 Collaboration
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A. V. Artamonov1, B. Bassalleck2, B. Bhuyan3,*, E. W. Blackmore4, D. A. Bryman5, S. Chen4,†, I-H. Chiang3, I.-A. Christidi6, P. S. Cooper7, M. V. Diwan3, J. S. Frank3, T. Fujiwara8, J. Hu4, D. E. Jaffe3, S. Kabe9, S. H. Kettell3, M. M. Khabibullin10, A. N. Khotjantsev10, P. Kitching11,‡, M. Kobayashi9, T. K. Komatsubara9, A. Konaka4, A. P. Kozhevnikov1, Yu. G. Kudenko10, A. Kushnirenko7,§, L. G. Landsberg1,**, B. Lewis2, K. K. Li3, L. S. Littenberg3, J. A. Macdonald4,**, J. Mildenberger4, O. V. Mineev10, M. Miyajima12, K. Mizouchi8, V. A. Mukhin1, N. Muramatsu13, T. Nakano13, M. Nomachi14, T. Nomura8, T. Numao4, V. F. Obraztsov1, K. Omata9, D. I. Patalakha1, S. V. Petrenko1, R. Poutissou4, E. J. Ramberg7, G. Redlinger3, T. Sato9, T. Sekiguchi9, T. Shinkawa15, R. C. Strand3, S. Sugimoto9, Y. Tamagawa12, R. Tschirhart7, T. Tsunemi9,††, D. V. Vavilov1, B. Viren3, N. V. Yershov10, Y. Yoshimura9, and T. Yoshioka9,‡‡ (E949 Collaboration)
1Institute for High Energy Physics, Protvino, Moscow Region, 142 280, Russia
2Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA
3Brookhaven National Laboratory, Upton, New York 11973, USA
4TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
5Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
6Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA
7Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
8Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
9High Energy Accelerator Research Organization (KEK), Oho, Tsukuba, Ibaraki 305-0801, Japan
10Institute for Nuclear Research RAS, 60 October Revolution Pr. 7a, 117312 Moscow, Russia
11Centre for Subatomic Research, University of Alberta, Edmonton, Canada T6G 2N5
12Department of Applied Physics, Fukui University, 3-9-1 Bunkyo, Fukui, Fukui 910-8507, Japan
13Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
14Laboratory of Nuclear Studies, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
15Department of Applied Physics, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan
Received 11 June 2005; published 11 November 2005
A sample of kinematically identified K+→π+π0 decays obtained with the E949 detector was used to search for the helicity-suppressed decay π0→νν̅ resulting in an upper limit of 2.7×10-7 at 90% confidence level. The upper limit is also applicable to π0 decays into unknown weakly-interacting particles.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.72.091102
DOI:
10.1103/PhysRevD.72.091102
PACS:
13.20.Cz, 14.40.Aq, 14.60.St
*Also at the Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India Present address: Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, Canada V8W 3P6. †Present address: Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China ‡Present address: TRIUMF, Canada §Present address: Institute for High Energy Physics, Protvino, Russia. **Deceased. ††Present address: Research Center for Nuclear Physics, Osaka University, Japan. ‡‡Present address: International Center for Elementary Particle Physics, University of Tokyo, Tokyo 113-0033, Japan.
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