Observation of a resonancelike structure in the pi( -)psi ' mass distribution in exclusive B -> K pi( -)psi ' decays

S-K Choi; SL Olsen; I Adachi; H Aihara; V Aulchenko; T Aushev; T Aziz; AM Bakich; V Balagura; I Bedny; U Bitenc; A Bondar; A Bozek; M Bracko; J Brodzicka; TE Browder; P Chang; Y Chao; A Chen; K-F Chen; WT Chen; BG Cheon; R Chistov; Y Choi; J Dalseno; M Danilov; M Dash; S Eidelman; N Gabyshev; B Golob; J Haba; T Hara; K Hayasaka; H Hayashii; M Hazumi; D Heffernan; Y Hoshi; W-S Hou; HJ Hyun; T Iijima; K Inami; A Ishikawa; H Ishino; R Itoh; M Iwasaki; Y Iwasaki; DH Kah; JH Kang; N Katayama; H Kawai; T Kawasaki; H Kichimi; HO Kim; SK Kim; YJ Kim; K Kinoshita; P Krizan; P Krokovny; R Kumar; CC Kuo; A Kuzmin; Y-J Kwon; JS Lange; JS Lee; MJ Lee; SE Lee; T Lesiak; A Limosani; S-W Lin; Y Liu; D Liventsev; F Mandl; A Matyja; S McOnie; T Medvedeva; W Mitaroff; K Miyabayashi; H Miyake; H Miyata; Y Miyazaki; R Mizuk; GR Moloney; E Nakano; M Nakao; S Nishida; O Nitoh; T Nozaki; S Ogawa; T Ohshima; S Okuno; H Ozaki; P Pakhlov; G Pakhlova; CW Park; H Park; LS Peak; R Pestotnik; LE Piilonen; H Sahoo; Y Sakai; O Schneider; AJ Schwartz; K Senyo; M Shapkin; CP Shen; H Shibuya; B Shwartz; JB Singh; A Somov; S Stanic; M Staric; T Sumiyoshi; SY Suzuki; F Takasaki; K Tamai; M Tanaka; Y Teramoto; I Tikhomirov; S Uehara; T Uglov; Y Unno; S Uno; P Urquijo; G Varner; K Vervink; S Villa; CH Wang; M-Z Wang; P Wang; XL Wang; Y Watanabe; R Wedd; E Won; BD Yabsley; Y Yamashita; CZ Yuan; ZP Zhang; V Zhulanov; A Zupanc; O Zyukova

Journal article

Observation of a resonancelike structure in the pi( -)psi ' mass distribution in exclusive B -> K pi( -)psi ' decays

S-K Choi, SL Olsen, I Adachi, H Aihara, V Aulchenko, T Aushev, T Aziz, AM Bakich, V Balagura, I Bedny, U Bitenc, A Bondar, A Bozek, M Bracko, J Brodzicka, TE Browder, P Chang, Y Chao, A Chen, K-F Chen Show all

PHYSICAL REVIEW LETTERS | AMER PHYSICAL SOC | Published : 2008

DOI: 10.1103/PhysRevLett.100.142001

Abstract

A distinct peak is observed in the pi +/- psi' invariant mass distribution near 4.43 GeV in B-->K pi +/- psi' decays. A fit using a Breit-Wigner resonance shape yields a peak mass and width of M=4433+/-4(stat)+/-2(syst) MeV and Gamma=45-13+18(stat)-13+30(syst) MeV. The product branching fraction is determined to be B(B 0-->K -/+Z+/-(4430)) x B(Z+/-(4430)-->pi+/-psi')=(4.1+/-1.0(stat)+/-1.4(syst)) x 10(-5), where Z+/-(4430) is used to denote the observed structure. The statistical significance of the observed peak is 6.5 sigma. These results are obtained from a 605 fb(-1) data sample that contains 657 x 10(6) BB pairs collected near the Upsilon(4S) resonance with the Belle detector at the KEK..

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