Observation of the decay Υ(4S)→Υ(1S)π π-

A Sokolov; M Shapkin; K Abe; K Abe; I Adachi; H Aihara; D Anipko; T Aushev; AM Bakich; E Barberio; M Barbero; I Bedny; K Belous; U Bitenc; I Bizjak; A Bondar; M Bračko; TE Browder; A Chen; WT Chen; BG Cheon; R Chistov; Y Choi; YK Choi; S Cole; J Dalseno; M Dash; A Drutskoy; S Eidelman; D Epifanov; S Fratina; T Gershon; A Go; G Gokhroo; B Golob; H Ha; J Haba; T Hara; Y Hasegawa; K Hayasaka; H Hayashii; M Hazumi; D Heffernan; Y Hoshi; S Hou; WS Hou; YB Hsiung; T Iijima; K Inami; A Ishikawa; R Itoh; M Iwasaki; Y Iwasaki; JH Kang; P Kapusta; N Katayama; H Kawai; T Kawasaki; HR Khan; H Kichimi; HJ Kim; YJ Kim; S Korpar; P Križan; P Krokovny; R Kulasiri; R Kumar; A Kuzmin; YJ Kwon; T Lesiak; A Limosani; SW Lin; D Liventsev; F Mandl; T Matsumoto; S McOnie; W Mitaroff; H Miyake; H Miyata; Y Miyazaki; T Nagamine; Y Nagasaka; I Nakamura; E Nakano; M Nakao; Z Natkaniec; S Nishida; O Nitoh; T Nozaki; S Ogawa; T Ohshima; S Okuno; Y Onuki; H Ozaki; H Palka; CW Park; H Park; LS Peak; R Pestotnik; LE Piilonen

Journal article

Observation of the decay Υ(4S)→Υ(1S)π π-

A Sokolov, M Shapkin, K Abe, K Abe, I Adachi, H Aihara, D Anipko, T Aushev, AM Bakich, E Barberio, M Barbero, I Bedny, K Belous, U Bitenc, I Bizjak, A Bondar, M Bračko, TE Browder, A Chen, WT Chen Show all

Physical Review D Particles Fields Gravitation and Cosmology | Published : 2007

DOI: 10.1103/PhysRevD.75.071103

Abstract

We study transitions between Υ states with the emission of charged pions using 477fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The measured product branching fraction B(Υ(4S)→Υ(1S)π+π-)×B(Υ(1S)→μ+μ-)=(4. 42±0.81(stat)±0.56(sys))×10-6. When the PDG value for B(Υ(1S)→μ+μ-) is used, this corresponds to B(Υ(4S) →Υ(1S)π+π-)=(1.78±0.33(stat)±0.23(sys)) ×10-4 and a partial decay width Γ(Υ(4S)→Υ(1S) π+π-)=(3.65±0.67(stat)±0.65(sys))keV. © 2007 The American Physical Society.