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Observation of B(+)-->pppi+, B0-->ppK0, and B(+)-->ppK(*+) |
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| Authors: | Wang M-Z Abe K Abe K Abe T Adachi I Aihara H Asano Y Aso T Aulchenko V Aushev T Bakich A M Bay A Bizjak I Bondar A Bozek A Bracko M Browder T E Chang M-C Chang P Chao Y Chen K-F Cheon B G Chistov R Choi S-K Choi Y Choi Y K Chu P H Chuvikov A Danilov M Dong L Y Drutskoy A Eidelman S Eiges V Fukunaga C Gabyshev N Garmash A Gershon T Gokhroo G Golob B Hara T Hayashii H Hazumi M Hokuue T Hoshi Y Hou W-S Huang H-C Inami K Ishikawa A Itoh R Iwasaki H Iwasaki M Iwasaki Y Kang J H Katayama N Kawai H Kawasaki T Kichimi H Kim H J Kim Hyunwoo Kim J H Kim S K Kinoshita K Koppenburg P Korpar S Krizan P |
| Institution: | Department of Physics, National Taiwan University, Taipei. |
| Abstract: | We report the first observation of a b-->u type charmless baryonic B decay, B+-->pppi(+), as well as b-->s type B0-->ppK0 and B+-->ppK(*+) decays. The analysis is based on a 78 fb(-1) data sample recorded on the Upsilon(4S) resonance with the Belle detector at KEKB. We find B(B+-->pppi(+))=(3.06(+0.73)(-0.62)+/-0.37)x10(-6), B(B0-->ppK0)=(1.88(+0.77)(-0.60)+/-0.23)x10(-6), and B(B+-->ppK(*+))=(10.3(+3.6+1.3)(-2.8-1.7))x10(-6). We also update B(B+-->ppK+)=(5.66(+0.67)(-0.57)+/-0.62)x10(-6) and present an upper limit on B(B0-->ppK(*0)) at the 90% confidence level. A common feature of the observed decay modes is threshold peaking in baryon pair invariant mass. |
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