Phys. Rev. Lett.
87,
161601
(2001)
[6 pages]
Observation of B→J/ψK1(1270)
K. Abe et al. (Belle Collaboration)
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K. Abe10, K. Abe38, I. Adachi10, Byoung Sup Ahn16, H. Aihara40, Y. Asano45, T. Aso44, V. Aulchenko2, T. Aushev14, A. M. Bakich36, E. Banas26, W. Bartel6,10, S. Behari10, P. K. Behera46, D. Beiline2, A. Bondar2, A. Bozek26, T. E. Browder9, B. C. K. Casey9, P. Chang25, Y. Chao25, B. G. Cheon35, S.-K. Choi8, Y. Choi35, J. Dragic19, A. Drutskoy14, S. Eidelman2, Y. Enari21, F. Fang9, H. Fujii10, C. Fukunaga42, M. Fukushima12, A. Garmash2,10, A. Gordon19, K. Gotow47, R. Guo23, J. Haba10, H. Hamasaki10, K. Hanagaki32, K. Hara30, T. Hara30, N. C. Hastings19, H. Hayashii22, M. Hazumi30, E. M. Heenan19, Y. Higasino21, I. Higuchi39, T. Higuchi40, H. Hirano43, T. Hojo30, Y. Hoshi38, S.-R. Hou25, W.-S. Hou25, S.-C. Hsu25, H.-C. Huang25, Y. Igarashi10, T. Iijima10, H. Ikeda10, K. Inami21, A. Ishikawa21, H. Ishino41, R. Itoh10, G. Iwai28, H. Iwasaki10, Y. Iwasaki10, D. J. Jackson30, P. Jalocha26, H. K. Jang34, M. Jones9, R. Kagan14, H. Kakuno41, J. Kaneko41, J. H. Kang48, J. S. Kang16, P. Kapusta26, N. Katayama10, H. Kawai3, H. Kawai40, N. Kawamura1, T. Kawasaki28, H. Kichimi10, D. W. Kim35, Heejong Kim48, H. J. Kim48, Hyunwoo Kim16, S. K. Kim34, T. H. Kim48, K. Kinoshita5, S. Kobayashi33, S. Koishi41, P. Krokovny2, R. Kulasiri5, S. Kumar31, A. Kuzmin2, Y.-J. Kwon48, J. S. Lange7, S. H. Lee34, D. Liventsev14, R.-S. Lu25, D. Marlow32, T. Matsubara40, S. Matsui21, S. Matsumoto4, T. Matsumoto21, Y. Mikami39, K. Miyabayashi22, H. Miyake30, H. Miyata28, G. R. Moloney19, G. F. Moorhead19, S. Mori45, T. Mori4, A. Murakami33, T. Nagamine39, Y. Nagasaka11, Y. Nagashima30, T. Nakadaira40, E. Nakano29, M. Nakao10, J. W. Nam35, S. Narita39, Z. Natkaniec26, K. Neichi38, S. Nishida17, O. Nitoh43, S. Noguchi22, T. Nozaki10, S. Ogawa37, T. Ohshima21, T. Okabe21, S. Okuno15, S. L. Olsen9, H. Ozaki10, P. Pakhlov14, H. Palka26, C. S. Park34, C. W. Park16, H. Park18, L. S. Peak36, M. Peters9, L. E. Piilonen47, E. Prebys32, J. L. Rodriguez9, N. Root2, M. Rozanska26, K. Rybicki26, H. Sagawa10, Y. Sakai10, H. Sakamoto17, M. Satapathy46, A. Satpathy10,5, S. Schrenk5, S. Semenov14, K. Senyo21, M. E. Sevior19, H. Shibuya37, B. Shwartz2, S. Stanič45, A. Sugi21, A. Sugiyama21, K. Sumisawa10, T. Sumiyoshi10, J.-I. Suzuki10, K. Suzuki3, S. Suzuki21,*, S. Y. Suzuki10, S. K. Swain9, T. Takahashi29, F. Takasaki10, M. Takita30, K. Tamai10, N. Tamura28, J. Tanaka40, M. Tanaka10, Y. Tanaka20, G. N. Taylor19, Y. Teramoto29, M. Tomoto10, T. Tomura40, S. N. Tovey19, K. Trabelsi9, T. Tsuboyama10, T. Tsukamoto10, S. Uehara10, K. Ueno25, Y. Unno3, S. Uno10, Y. Ushiroda10, S. E. Vahsen32, K. E. Varvell36, C. H. Wang24, J. G. Wang47, M.-Z. Wang25, Y. Watanabe41, E. Won34, B. D. Yabsley10, Y. Yamada10, M. Yamaga39, A. Yamaguchi39, H. Yamamoto9, Y. Yamashita27, M. Yamauchi10, S. Yanaka41, K. Yoshida21, Y. Yusa39, H. Yuta1, C. C. Zhang13, J. Zhang45, H. W. Zhao10, Y. Zheng9, V. Zhilich2, and D. Zontar45 (Belle Collaboration)
1Aomori University, Aomori
2Budker Institute of Nuclear Physics, Novosibirsk
3Chiba University, Chiba
4Chuo University, Tokyo
5University of Cincinnati, Cincinnati, Ohio
6Deutsches Elektronen-Synchrotron, Hamburg
7University of Frankfurt, Frankfurt
8Gyeongsang National University, Chinju
9University of Hawaii, Honolulu, Hawaii
10High Energy Accelerator Research Organization (KEK), Tsukuba
11Hiroshima Institute of Technology, Hiroshima
12Institute for Cosmic Ray Research, University of Tokyo, Tokyo
13Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
14Institute for Theoretical and Experimental Physics, Moscow
15Kanagawa University, Yokohama
16Korea University, Seoul
17Kyoto University, Kyoto
18Kyungpook National University, Taegu
19University of Melbourne, Victoria
20Nagasaki Institute of Applied Science, Nagasaki
21Nagoya University, Nagoya
22Nara Women's University, Nara
23National Kaohsiung Normal University, Kaohsiung
24National Lien-Ho Institute of Technology, Miao Li
25National Taiwan University, Taipei
26H. Niewodniczanski Institute of Nuclear Physics, Krakow
27Nihon Dental College, Niigata
28Niigata University, Niigata
29Osaka City University, Osaka
30Osaka University, Osaka
31Panjab University, Chandigarh
32Princeton University, Princeton, New Jersey
33Saga University, Saga
34Seoul National University, Seoul
35Sungkyunkwan University, Suwon
36University of Sydney, Sydney, New South Wales
37Toho University, Funabashi
38Tohoku Gakuin University, Tagajo
39Tohoku University, Sendai
40University of Tokyo, Tokyo
41Tokyo Institute of Technology, Tokyo
42Tokyo Metropolitan University, Tokyo
43Tokyo University of Agriculture and Technology, Tokyo
44Toyama National College of Maritime Technology, Toyama
45University of Tsukuba, Tsukuba
46Utkal University, Bhubaneswer
47Virginia Polytechnic Institute and State University, Blacksburg, Virginia
48Yonsei University, Seoul
Received 9 May 2001; published 27 September 2001
We report the first observation of the exclusive decay process B→J/ψK1(1270) using a sample of 11.2M BB̅ meson pairs collected in the Belle detector at the KEKB asymmetric energy e+e- collider. We measure branching fractions of B[B0→J/ψK10(1270)] = (1.30±0.34±0.32)×10-3 and B[B+→J/ψK1+(1270)] = (1.80±0.34±0.39)×10-3, where the first error is statistical and the second is systematic. These modes constitute approximately 15% of the total number of B→J/ψX decays. No evidence is seen for B→J/ψK1(1400) and we set an upper limit for this branching fraction.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.161601
DOI:
10.1103/PhysRevLett.87.161601
*Present address: Yokkaichi University, Yokkaichi City.
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