Observation of B(+/-) --> p(-)pK(+/-). Abe K , Abe R , Abe T , Adachi I , Ahn Byoung Sup , Aihara H , Akatsu M , Asano Y , Aso T , Aulchenko V , Aushev T , Bakich A M , Ban Y , Banas E , Behari S , Behera P K , Bondar A , Bozek A , Bracko M , Brodzicka J , Browder T E , Casey B C K , Chang P , Chao Y , Chen K-F , Cheon B G , Chistov R , Choi S-K , Choi Y , Danilov M , Dong L Y , Dragic J , Drutskoy A , Eidelman S , Eiges V , Enari Y , Everton C W , Fang F , Fujii H , Fukunaga C , Fukushima M , Gabyshev N , Garmash A , Gershon T , Gotow K , Guo R , Haba J , Hamasaki H , Handa F , Hara K , Hara T , Hayashii H , Hazumi M , Heenan E M , Higuchi I , Higuchi T , Hojo T , Hokuue T , Hoshi Y , Hou S R , Hou W-S , Huang H-C , Igaki T , Igarashi Y , Iijima T , Ikeda H , Inami K , Ishikawa A , Ishino H , Itoh R , Iwasaki H , Iwasaki Y , Jalocha P , Jang H K , Kang J H , Kang J S , Kapusta P , Katayama N , Kawai H , Kawakami Y , Kawamura N , Kawasaki T , Kichimi H , Kim D W , Kim H J , Kim H O , Kim Hyunwoo , Kim S K , Kinoshita K , Konishi H , Korpar S , Krizan P , Krokovny P , Kumar S , Kuzmin A , Kwon Y-J , Lange J S , Leder G , Lee S H , Limosani A , Liventsev D , Lu R-S , MacNaughton J , Majumder G , Mandl F , Matsuishi T , Matsumoto S , Mikami Y , Mitaroff W , Miyabayashi K , Miyabayashi Y , Miyake H , Miyata H , Moloney G R , Nagamine T , Nagasaka Y , Nagashima Y , Nakao M , Nam J W , Natkaniec Z , Nishida S , Nitoh O , Noguchi S , Nozaki T , Ogawa S , Ohshima T , Okabe T , Okuno S , Olsen S L , Ostrowicz W , Ozaki H , Pakhlov P , Palka H , Park C S , Park C W , Park K S , Peak L S , Perroud J-P , Peters M , Piilonen L E , Ronga F , Root N , Rybicki K , Sagawa H , Sakai Y , Sakamoto H , Satapathy M , Satpathy A , Schneider O , Schrenk S , Schwanda C , Semenov S , Senyo K , Shibuya H , Schwartz B , Sidorov V , Singh J B , Stanic S , Sugi A , Sugiyama A , Sumisawa K , Suzuki K , Suzuki S Y , Takahashi T , Takasaki F , Takita M , Tamai K , Tamura N , Tanaka J , Taylor G N , Teramoto Y , Tokuda S , Tomura T , Tovey S N , Trabelsi K , Tsuboyama T , Tsukamoto T , Uehara S , Ueno K , Unno Y , Uno S , Varvell K E , Wang C C , Wang C H , Wang J G , Wang M-Z , Watanabe Y , Won E , Yabsley B D , Yamada Y , Yamaga M , Yamaguchi A , Yamamoto H , Yamashita Y , Yamauchi M , Yanaka S , Yeh P , Yokoyama M , Yuan Y , Zhang J , Zheng Y , Zontar D , Null Null Physical Review Letters（2002）
摘要
We report the observation of the decay mode B(+/-) --> p(-)pK(+/-)based on an analysis of 29.4 fb(-1) of data collected by the Belle detector at KEKB. This is the first example of a b-->s transition with baryons in the final state. The p(-)p mass spectrum in this decay is inconsistent with phase space and is peaked at low mass. The branching fraction for this decay is measured to be B(B+/--->p(-)pK+/-) = [4.3(+1.1)(-0.9)(stat)+/-0.5(syst)]x 10(-6). We also report upper limits for the decays B(0)-->p(-)pK(S) and B(+/-)-->p(-)p pi(+/-).
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