Observation of the decay B --> Kl+l-

K Abe; K Abe; R Abe; I Adachi; Byoung Sup Ahn; H Aihara; M Akatsu; Y Asano; T Aso; V Aulchenko; T Aushev; A M Bakich; E Banas; S Behari; P K Behera; A Bondar; A Bozek; T E Browder; B C K Casey; P Chang; Y Chao; B G Cheon; R Chistov; S-K Choi; Y Choi; L Y Dong; A Drutskoy; S Eidelman; Y Enari; F Fang; H Fujii; C Fukunaga; M Fukushima; N Gabyshev; A Garmash; T Gershon; A Gordon; K Gotow; R Guo; J Haba; H Hamasaki; K Hanagaki; F Handa; K Hara; T Hara; N C Hastings; H Hayashii; M Hazumi; E M Heenan; I Higuchi; T Higuchi; H Hirano; T Hojo; T Hokuue; Y Hoshi; K Hoshina; 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; H Iwasaki; Y Iwasaki; D J Jackson; H K Jang; 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; Heejong Kim; H J Kim; H O Kim; Hyunwoo Kim; S K Kim; K Kinoshita; S Kobayashi; H Konishi; P Krokovny; R Kulasiri; S Kumar; A Kuzmin; Y-J Kwon; J S Lange; G Leder; S H Lee; D Liventsev; R-S Lu; J MacNaughton; T Matsubara; 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; Z Natkaniec; K Neichi; S Nishida; O Nitoh; S Noguchi; T Nozaki; S Ogawa; T Ohshima; T Okabe; S Okuno; S L Olsen; W Ostrowicz; H Ozaki; P Pakhlov; H Palka; C S Park; C W Park; H Park; K S Park; L S Peak; M Peters; L E Piilonen; J L Rodriguez; N Root; M Rozanska; K Rybicki; J Ryuko; H Sagawa; Y Sakai; H Sakamoto; A Satpathy; S Schrenk; S Semenov; K Senyo; M E Sevior; H Shibuya; B Schwartz; S Stanic; A Sugi; A Sugiyama; K Sumisawa; T Sumiyoshi; K Suzuki; S Suzuki; S Y Suzuki; S K Swain; H Tajima; 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; K E Varvell; C C Wang; 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; J Yashima; M Yokoyama; K Yoshida; Y Yusa; H Yuta; C C Zhang; J Zhang; H W Zhao; Y Zheng; V Zhilich; D Zontar; Belle Collaboration

doi:10.1103/PhysRevLett.88.021801

Observation of the decay B --> Kl+l-

Phys Rev Lett. 2002 Jan 14;88(2):021801. doi: 10.1103/PhysRevLett.88.021801. Epub 2001 Dec 27.

Authors

K Abe¹, K Abe, R Abe, I Adachi, Byoung Sup Ahn, H Aihara, M Akatsu, Y Asano, T Aso, V Aulchenko, T Aushev, A M Bakich, E Banas, S Behari, P K Behera, A Bondar, A Bozek, T E Browder, B C K Casey, P Chang, Y Chao, B G Cheon, R Chistov, S-K Choi, Y Choi, L Y Dong, A Drutskoy, S Eidelman, Y Enari, F Fang, H Fujii, C Fukunaga, M Fukushima, N Gabyshev, A Garmash, T Gershon, A Gordon, K Gotow, R Guo, J Haba, H Hamasaki, K Hanagaki, F Handa, K Hara, T Hara, N C Hastings, H Hayashii, M Hazumi, E M Heenan, I Higuchi, T Higuchi, H Hirano, T Hojo, T Hokuue, Y Hoshi, K Hoshina, 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, H Iwasaki, Y Iwasaki, D J Jackson, H K Jang, 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, Heejong Kim, H J Kim, H O Kim, Hyunwoo Kim, S K Kim, K Kinoshita, S Kobayashi, H Konishi, P Krokovny, R Kulasiri, S Kumar, A Kuzmin, Y-J Kwon, J S Lange, G Leder, S H Lee, D Liventsev, R-S Lu, J MacNaughton, T Matsubara, 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, Z Natkaniec, K Neichi, S Nishida, O Nitoh, S Noguchi, T Nozaki, S Ogawa, T Ohshima, T Okabe, S Okuno, S L Olsen, W Ostrowicz, H Ozaki, P Pakhlov, H Palka, C S Park, C W Park, H Park, K S Park, L S Peak, M Peters, L E Piilonen, J L Rodriguez, N Root, M Rozanska, K Rybicki, J Ryuko, H Sagawa, Y Sakai, H Sakamoto, A Satpathy, S Schrenk, S Semenov, K Senyo, M E Sevior, H Shibuya, B Schwartz, S Stanic, A Sugi, A Sugiyama, K Sumisawa, T Sumiyoshi, K Suzuki, S Suzuki, S Y Suzuki, S K Swain, H Tajima, 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, K E Varvell, C C Wang, 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, J Yashima, M Yokoyama, K Yoshida, Y Yusa, H Yuta, C C Zhang, J Zhang, H W Zhao, Y Zheng, V Zhilich, D Zontar; Belle Collaboration

Affiliation

¹ High Energy Accelerator Research Organization (KEK), Tsukuba.

PMID: 11801003
DOI: 10.1103/PhysRevLett.88.021801

Abstract

We report a search for the flavor-changing neutral current decay B-->K(*)l+l- using a 29.1 fb(-1) data sample accumulated at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- storage ring. We observe the decay process B-->Kl+l-(l = e, mu), for the first time, with a branching fraction of B(B-->Kl+l-) = (0.75(+0.25)(-0.21)+/-0.09)x10(-6).