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. 2001 Oct 15;87(16):161601.
doi: 10.1103/PhysRevLett.87.161601. Epub 2001 Sep 27.

Observation of B --> J/psi K(1)(1270)

K Abe  1 , K Abe, I Adachi, B S Ahn, H Aihara, Y Asano, T Aso, V Aulchenko, T Aushev, A M Bakich, E Banas, W Bartel, S Behari, P K Behera, D Beiline, A Bondar, A Bozek, T E Browder, B C Casey, P Chang, Y Chao, B G Cheon, S K Choi, Y Choi, J Dragic, A Drutskoy, S Eidelman, Y Enari, F Fang, H Fujii, C Fukunaga, M Fukushima, A Garmash, A Gordon, K Gotow, R Guo, J Haba, H Hamasaki, K Hanagaki, K Hara, T Hara, N C Hastings, H Hayashii, M Hazumi, E M Heenan, Y Higasino, I Higuchi, T Higuchi, H Hirano, T Hojo, Y Hoshi, S R Hou, W S Hou, S C Hsu, H C Huang, Y Igarashi, T Iijima, H Ikeda, K Inami, A Ishikawa, H Ishino, R Itoh, G Iwai, H Iwasaki, Y Iwasaki, D J Jackson, P Jalocha, H K Jang, M Jones, R Kagan, H Kakuno, J Kaneko, J H Kang, J S Kang, P Kapusta, N Katayama, H Kawai, H Kawai, N Kawamura, T Kawasaki, H Kichimi, D W Kim, H Kim, H J Kim, H Kim, S K Kim, T H Kim, K Kinoshita, S Kobayashi, S Koishi, P Krokovny, R Kulasiri, S Kumar, A Kuzmin, Y J Kwon, J S Lange, S H Lee, D Liventsev, R S Lu, D Marlow, T Matsubara, S Matsui, S Matsumoto, T Matsumoto, Y Mikami, K Miyabayashi, H Miyake, H Miyata, G R Moloney, G F Moorhead, S Mori, T Mori, A Murakami, T Nagamine, Y Nagasaka, Y Nagashima, T Nakadaira, E Nakano, M Nakao, J W Nam, S Narita, Z Natkaniec, K Neichi, S Nishida, O Nitoh, S Noguchi, T Nozaki, S Ogawa, T Ohshima, T Okabe, S Okuno, S L Olsen, H Ozaki, P Pakhlov, H Palka, C S Park, C W Park, H Park, L S Peak, M Peters, L E Piilonen, E Prebys, J L Rodriguez, N Root, M Rozanska, K Rybicki, H Sagawa, Y Sakai, H Sakamoto, M Satapathy, A Satpathy, S Schrenk, S Semenov, K Senyo, M E Sevior, H Shibuya, B Shwartz, S Stanic, A Sugi, A Sugiyama, K Sumisawa, T Sumiyoshi, J I Suzuki, K Suzuki, S Suzuki, S Y Suzuki, S K Swain, T Takahashi, F Takasaki, M Takita, K Tamai, N Tamura, J Tanaka, M Tanaka, Y Tanaka, G N Taylor, Y Teramoto, M Tomoto, T Tomura, S N Tovey, K Trabelsi, T Tsuboyama, T Tsukamoto, S Uehara, K Ueno, Y Unno, S Uno, Y Ushiroda, S E Vahsen, K E Varvell, C H Wang, J G Wang, M Z Wang, Y Watanabe, E Won, B D Yabsley, Y Yamada, M Yamaga, A Yamaguchi, H Yamamoto, Y Yamashita, M Yamauchi, S Yanaka, K Yoshida, Y Yusa, H Yuta, C C Zhang, J Zhang, H W Zhao, Y Zheng, V Zhilich, D Zontar; Belle Collaboration
Affiliations

Observation of B --> J/psi K(1)(1270)

K Abe et al. Phys Rev Lett. .

Abstract

We report the first observation of the exclusive decay process B-->J/psi K(1)(1270) using a sample of 11.2M BB macro meson pairs collected in the Belle detector at the KEKB asymmetric energy e(+)e(-) collider. We measure branching fractions of B[B(0)-->J/psi K(0)(1)(1270)] = (1.30+/-0.34+/-0.32) x 10(-3) and B[B(+)-->J/psi K(+)(1)(1270)] = (1.80+/-0.34+/-0.39) x 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/psi X decays. No evidence is seen for B-->J/psi K(1)(1400) and we set an upper limit for this branching fraction.

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