Observation of B-0 -> Lambda(Lambda)over-barK(0) and B-0 -> Lambda(Lambda)over-barK*(0) at Belle

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/38961

Title:	Observation of B-0 -> Lambda(Lambda)over-barK(0) and B-0 -> Lambda(Lambda)over-barK*(0) at Belle
Authors:	Chang,YW;Wang,MZ;Adachi,I;Aihara,H;Aushev,T;Bakich,AM;Balagura,V;Bay,A;Bhardwaj,V;Bitenc,U;Bondar,A;Bozek,A;Bracko,M;Browder,TE;Chao,Y;Chen,A;Chistov,R;Choi,Y;Dalseno,J;Danilov,M;Dash,M;Drutskoy,A;Eidelman,S;Goldenzweig,P;Ha,H;Han,BY;Hara,T;Hayasaka,K;Hayashii,H;Hazumi,M;Heffernan,D;Horii,Y;Hoshi,Y;Hou,WS;Hyun,HJ;Inami,K;Ishikawa,A;Iwasaki,M;Iwasaki,Y;Joshi,NJ;Kah,DH;Kang,JH;Kawai,H;Kawasaki,T;Kichimi,H;Kim,HJ;Kim,YI;Kim,YJ;Ko,BR;Korpar,S;Krizan,P;Kwon,YJ;Kyeong,SH;Lee,JS;Lee,MJ;Lee,SE;Lesiak,T;Limosani,A;Lin,SW;Liu,C;Liu,Y;Louvot,R;Mandl,F;Matyja,A;McOnie,S;Miyabayashi,K;Miyata,H;Miyazaki,Y;Mizuk,R;Nagasaka,Y;Nakao,M;Natkaniec,Z;Nishida,S;Nitoh,O;Ogawa,S;Okuno,S;Ozaki,H;Pakhlov,P;Pakhlova,G;Park,CW;Park,HK;Park,KS;Peak,LS;Pestotnik,R;Piilonen,LE;Rozanska,M;Sahoo,H;Sakai,Y;Schneider,O;Sekiya,A;Senyo,K;Shapkin,M;Shiu,JG;Shwartz,B;Singh,JB;Stanic,S;Staric,M;Sumisawa,K;Tanaka,M;Taylor,GN;Teramoto,Y;Tikhomirov,I;Uehara,S;Uglov,T;Unno,Y;Uno,S;Usov,Y;Varner,G;Vervink,K;Wang,CH;Wang,P;Wang,XL;Watanabe,Y;Wedd,R;Wei,JT;Won,E;Yabsley,BD;Yamashita,Y;Zhang,ZP;Zhilich,V;Zivko,T;Zupanc,A;Zyukova,O
Contributors:	物理研究所
Keywords:	BARYONIC B-DECAYS;PARTICLE PHYSICS;ANTIBARYON
Date:	2009
Issue Date:	2010-07-08 14:00:29 (UTC+8)
Publisher:	中央大學
Abstract:	We study the charmless decays B -> Lambda(Lambda) over barh , where h stands for pi(+), K+, K-0, K(+), or K(0), using a 605 fb(-1) data sample collected at the Gamma(4S) resonance with the Belle detector at the KEKB asymmetric energy e(+)e(-) collider. We observe B-0 -> Lambda(Lambda) over barK(0) and B-0 -> Lambda(Lambda) over barK(0) with branching fractions of (4.76(-0.68)(+0.84) (stat) +/- 0. 61 (syst)) x 10(-6) and (2.46(-0.72)(+0.87) +/- 0.34) x 10(-6), respectively. The significances of these signals in the threshold-mass enhanced mass region, M Lambda(Lambda) over bar < 2.85 GeV / c(2), are 12.4 sigma and 9.3 sigma, respectively. We also update the branching fraction B(B+ -> Lambda<(Lambda)over bar>K+) = (3.38(-0.36)(+0.41) +/- 0.41) x 10(-6) with better accuracy, and report the following measurement or 90% confidence level upper limit in the threshold-mass-enhanced region: B(B+ -> Lambda(Lambda) over barK(+)) = (2.19(-0.88)(+1.13) +/- 0.33) x 10(-6) with 3.7 sigma significance; B(B+ -> Lambda(Lambda) over bar pi(+)) < 0.94) x 10(-6). A related search for B-0 -> Lambda<(Lambda)over bar>(D) over bar0 yields a branching fraction B(B-0 -> Lambda(Lambda) over bar(D) over bar (0)) = (1.05(-0.44)(+0.57) +/- 0.14) x 10(-5). This may be compared with the large, similar to 10(-4), branching fraction observed for B-0 -> p (p) over bar(D) over bar (0). . The M Lambda(Lambda) over bar enhancements near threshold and related angular distributions for the observed modes are also reported.
Relation:	PHYSICAL REVIEW D
Appears in Collections:	[Graduate Institute of Physics] journal & Dissertation

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