Observation of [formula presented]

A Ishikawa; K Abe; K Abe; T Abe; I Adachi; BS Ahn; H Aihara; K Akai; M Akatsu; M Akemoto; Y Asano; T Aso; V Aulchenko; T Aushev; AM Bakich; Y Ban; A Bay; I Bizjak; A Bondar; A Bozek; M Bračko; TE Browder; P Chang; Y Chao; KF Chen; BG Cheon; R Chistov; SK Choi; Y Choi; YK Choi; A Chuvikov; M Danilov; LY Dong; A Drutskoy; S Eidelman; V Eiges; Y Enari; J Flanagan; C Fukunaga; Y Funakoshi; K Furukawa; N Gabyshev; A Garmash; T Gershon; B Golob; R Guo; J Haba; C Hagner; F Handa; H Hayashii; M Hazumi; L Hinz; T Hokuue; Y Hoshi; WS Hou; YB Hsiung; HC Huang; T Iijima; K Inami; R Itoh; H Iwasaki; M Iwasaki; Y Iwasaki; JH Kang; JS Kang; N Katayama; H Kawai; T Kawasaki; H Kichimi; E Kikutani; HJ Kim; H Kim; JH Kim; SK Kim; K Kinoshita; P Koppenburg; S Korpar; P Križan; P Krokovny; A Kuzmin; YJ Kwon; JS Lange; G Leder; SH Lee; T Lesiak; J Li; A Limosani; SW Lin; D Liventsev; J MacNaughton; G Majumder; F Mandl; M Masuzawa; T Matsumoto; A Matyja; S Michizono; T Mimashi; W Mitaroff; K Miyabayashi; H Miyake

Journal article

Observation of [formula presented]

A Ishikawa, K Abe, K Abe, T Abe, I Adachi, BS Ahn, H Aihara, K Akai, M Akatsu, M Akemoto, Y Asano, T Aso, V Aulchenko, T Aushev, AM Bakich, Y Ban, A Bay, I Bizjak, A Bondar, A Bozek Show all

Physical Review Letters | Published : 2003

DOI: 10.1103/PhysRevLett.91.261601

Abstract

We report the observation of the flavor-changing neutral current decay [Formula presented] and an improved measurement of the decay [Formula presented], where [Formula presented] represents an electron or a muon, with a data sample of [Formula presented] accumulated at the [Formula presented] resonance with the Belle detector at KEKB. The results for the branching fractions are [Formula Presented] and [Formula Presented], where the first error is statistical, the second is systematic and the third is from model dependence. © 2003 The American Physical Society.