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Observation of a resonancelike structure in the pi +- psi' mass distribution in exclusive B-->Kpi +- psi' decays |
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| Authors: | Choi S-K Olsen S L Adachi I Aihara H Aulchenko V Aushev T Aziz T Bakich A M Balagura V Bedny I Bitenc U Bondar A Bozek A Bracko M Brodzicka J Browder T E Chang P Chao Y Chen A Chen K-F Chen W T Cheon B G Chistov R Choi Y Dalseno J Danilov M Dash M Eidelman S Gabyshev N Golob B Haba J Hara T Hayasaka K Hayashii H Hazumi M Heffernan D Hoshi Y Hou W-S Hyun H J Iijima T Inami K Ishikawa A Ishino H Itoh R Iwasaki M Iwasaki Y Kah D H Kang J H Katayama N Kawai H Kawasaki T Kichimi H Kim H O Kim S K Kim Y J Kinoshita K Krizan P Krokovny P Kumar R Kuo C C Kuzmin A Kwon Y-J Lange J S Lee J S Lee M J |
| Institution: | Gyeongsang National University, Chinju. |
| 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 KEKB asymmetric energy e+ e- collider. |
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