Phys. Rev. D
77,
052003
(2008)
[40 pages]
Measurement of the K+→π+νν̅ branching ratio
S. Adler et al.
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S. Adler1, V. V. Anisimovsky2, M. Aoki3,*, M. Ardebili4, A. V. Artamonov5, M. Atiya1, B. Bassalleck6, A. O. Bazarko4, B. Bhuyan1,†, E. W. Blackmore3, D. A. Bryman7, S. Chen8,3, I-H. Chiang1, I.-A. Christidi9,‡, M. R. Convery4, P. S. Cooper10, M. V. Diwan1, J. S. Frank1, T. Fujiwara11, J. Haggerty1, J. Hu3, T. Inagaki12, M. M. Ito4, A. P. Ivashkin2, D. E. Jaffe1, S. Kabe12, M. Kazumori12,§, Y. Kuno12,*, M. Kuriki12,**, S. H. Kettell1, M. M. Khabibullin2, A. N. Khotjantsev2, P. Kitching13, M. Kobayashi12, T. K. Komatsubara12, A. Konaka3, A. P. Kozhevnikov5, Yu. G. Kudenko2, A. Kushnirenko10,††, L. G. Landsberg5,‡‡, B. Lewis6, K. K. Li1, L. S. Littenberg1, J. A. Macdonald3,‡‡, D. R. Marlow4, R. A. McPherson4, P. D. Meyers4, J. Mildenberger3, O. V. Mineev2, M. Miyajima14, K. Mizouchi11, V. A. Mukhin5, N. Muramatsu15, T. Nakano15, M. Nomachi16, T. Nomura11, T. Numao3, V. F. Obraztsov5, K. Omata12, D. I. Patalakha5, S. V. Petrenko5, R. Poutissou3, E. J. Ramberg10, G. Redlinger1, T. Sato12, T. Sekiguchi12, T. Shinkawa17, F. C. Shoemaker4, A. J. S. Smith4, J. R. Stone4, R. C. Strand1, S. Sugimoto12, Y. Tamagawa14, R. Tschirhart10, T. Tsunemi12,a, D. V. Vavilov5,b, B. Viren1, N. V. Yershov2, Y. Yoshimura12, and T. Yoshioka12,c
1Brookhaven National Laboratory, Upton, New York 11973, USA
2Institute for Nuclear Research RAS, 60 October Revolution Pr. 7a, 117312 Moscow, Russia
3TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
4Joseph Henry Laboratories, Princeton University, Princeton, New Jersey 08544, USA
5Institute for High Energy Physics, Protvino, Moscow Region, 142 280, Russia
6Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA
7Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
8Department of Engineering Physics, Tsinghua University, Beijing 100084, China
9Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA
10Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
11Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
12High Energy Accelerator Research Organization (KEK), Oho, Tsukuba, Ibaraki 305-0801, Japan
13Centre for Subatomic Research, University of Alberta, Edmonton, Canada T6G 2N5
14Department of Applied Physics, Fukui University, 3-9-1 Bunkyo, Fukui, Fukui 910-8507, Japan
15Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
16Laboratory of Nuclear Studies, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
17Department of Applied Physics, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan
Received 6 September 2007; published 13 March 2008
Experiment E949 at Brookhaven National Laboratory studied the rare decay K+→π+νν̅ and other processes with an exposure of 1.77×1012 K+’s. The data were analyzed using a blind analysis technique yielding one candidate event with an estimated background of 0.30±0.03 events. Combining this result with the observation of two candidate events by the predecessor experiment E787 gave the branching ratio B(K+→π+νν̅ )=(1.47-0.89+1.30)×10-10, consistent with the standard model prediction of (0.74±0.20)×10-10. This is a more detailed report of results previously published [ V. V. Anisimovsky et al. Phys. Rev. Lett. 93 031801 (2004)].
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.77.052003
DOI:
10.1103/PhysRevD.77.052003
PACS:
13.20.Eb, 12.15.Hh, 14.80.Mz
*Present address: Department of Physics, Osaka University, Osaka 560-0043, Japan. †Also at: Department of Physics, University of Delhi, Delhi 1100007, India. ‡Present address: Department of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece. §Also at: Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan. **Present address: Graduate School of Advanced Sciences of Matter, Hiroshima University, Hiroshima, 739-8530, Japan. ††Present address: Institute for High Energy Physics, Protvino, Moscow Region, 142 280, Russia. ‡‡Deceased. aPresent address: Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan. bPresent address: Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA. cPresent address: International Center for Elementary Particle Physics, University of Tokyo, Tokyo 113-0033, Japan.
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