Observation of B(+)-->pppi+, B0-->ppK0, and B(+)-->ppK(*+).

M-Z Wang, K Abe,K Abe,T Abe,I Adachi,H Aihara,Y Asano,T Aso,V Aulchenko,T Aushev,A M Bakich,A Bay,I Bizjak,A Bondar,A Bozek,M Bracko,T E Browder,M-C Chang,P Chang,Y Chao,K-F Chen,B G Cheon,R Chistov,S-K Choi, Y Choi,Y K Choi, P H Chu,A Chuvikov, M Danilov,L Y Dong,A Drutskoy,S Eidelman,V Eiges,C Fukunaga,N Gabyshev,A Garmash,T Gershon,G Gokhroo,B Golob,T Hara,H Hayashii,M Hazumi,T Hokuue,Y Hoshi,W-S Hou,H-C Huang,K Inami,A Ishikawa,R Itoh,H Iwasaki,M Iwasaki,Y Iwasaki,J H Kang,N Katayama,H Kawai,T Kawasaki,H Kichimi,H J Kim,Hyunwoo Kim,J H Kim,S K Kim,K Kinoshita,P Koppenburg,S Korpar,P Krizan,P Krokovny,A Kuzmin,Y-J Kwon,J S Lange,S H Lee,T Lesiak, A Limosani,S-W Lin,J MacNaughton,G Majumder,F Mandl,T Matsumoto,W Mitaroff,H Miyake,H Miyata,T Nagamine,Y Nagasaka,E Nakano,S Nishida,O Nitoh,S Ogawa,T Ohshima,S Okuno,S L Olsen,W Ostrowicz,H Ozaki,P Pakhlov,H Palka,C W Park,H Park,N Parslow,L E Piilonen,M Rozanska,H Sagawa,S Saitoh,Y Sakai,T R Sarangi,O Schneider,A J Schwartz,S Semenov,H Shibuya,V Sidorov,J B Singh,N Soni,S Stanic,M Staric,A Sugiyama,K Sumisawa,T Sumiyoshi,S Suzuki,S Y Suzuki,F Takasaki,K Tamai,N Tamura,M Tanaka,Y Teramoto,T Tomura,T Tsuboyama,T Tsukamoto,S Uehara,S Uno,G Varner,K E Varvell,C H Wang,J G Wang,Y Watanabe,Y Yamada,A Yamaguchi,Y Yamashita,M Yamauchi,H Yanai,J Ying,Y Yuan,Y Yusa,C C Zhang,Z P Zhang,V Zhilich,D Zontar,

Physical review letters（2004）

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摘要

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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