Determination Of|vub|from Measurements of the Inclusive Charmless Semileptonic Partial Rates Ofbmesons Using Full Reconstruction Tags

I Bizjak,K Abe,H Aihara,Y Asano,S Bahinipati,AM Bakich,Y Ban,E Barberio,M Barbero,A Bay,U Bitenc,S Blyth,A Bondar,A Bozek,M Bracko,J Brodzicka,TE Browder,Y Chao,A Chen, WT Chen,BG Cheon,R Chistov,SK Choi,Y Choi,YK Choi,A Chuvikov,S Cole,J Dalseno,M Danilov,M Dash,LY Dong,A Drutskoy,S Eidelman,Y Enari,F Fang,S Fratina,N Gabyshev,A Garmash,T Gershon,G Gokhroo,B Golob,A Gorisek,J Haba,T Hara,H Hayashii,M Hazumi,L Hinz,T Hokuue,Y Hoshi,S Hou,WS Hou,T Iijima,A Imoto,K Inami,A Ishikawa,R Itoh,M Iwasaki,Y Iwasaki,JH Kang,JS Kang,P Kapusta,N Katayama,H Kawai,T Kawasaki,HR Khan,H Kichimi,HJ Kim,SM Kim,K Kinoshita,S Korpar,P Krizan,P Krokovny,R Kulasiri,S Kumar,CC Kuo,A Kuzmin,YJ Kwon,G Leder,SE Lee,T Lesiak,J Li,A Limosani,SW Lin,D Liventsev,J MacNaughton,G Majumder,F Mandl,T Matsumoto,A Matyja,Y Mikami,W Mitaroff,K Miyabayashi,H Miyake,H Miyata,R Mizuk,T Nagamine,Y Nagasaka,I Nakamura,E Nakano,M Nakao,Z Natkaniec,S Nishida,O Nitoh,T Nozaki,S Ogawa,T Ohshima,T Okabe,S Okuno,SL Olsen,Y Onuki,W Ostrowicz,P Pakhlov,H Park,N Parslow,LS Peak, R Pestotnik,LE Piilonen,M Rozanska,H Sagawa,Y Sakai,N Sato,T Schietinger,O Schneider,P Schonmeier,C Schwanda,K Senyo,ME Sevior,H Shibuya,B Shwartz,V Sidorov,A Somov,N Soni,R Stamen,S Stanic,M Staric,T Sumiyoshi,S Suzuki,SY Suzuki,O Tajima,F Takasaki,K Tamai,N Tamura,M Tanaka,Y Teramoto,XC Tian,T Tsuboyama,T Tsukamoto,S Uehara,T Uglov,K Ueno,S Uno,P Urquijo,G Varner,KE Varvell,S Villa,CC Wang,CH Wang,Y Watanabe,QL Xie,BD Yabsley,A Yamaguchi,Y Yamashita,M Yamauchi,H Yang,LM Zhang, ZP Zhang,V Zhilich,D Zontar

Physical review letters（2005）

Cited 56|Views97

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Abstract

We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element /Vub/, based on 253 fb(-1) of data collected by the Belle detector at the KEKB e+ e- asymmetric collider. Events are tagged by fully reconstructing one of the B mesons, produced in pairs from Gamma(4S). The signal for b --> u semileptonic decay is distinguished from the b --> c background using the hadronic mass Mx, the leptonic invariant mass squared q2 and the variable P+ [triple bond] Ex - /px/. The results are obtained for events with p(l)* > or = 1 GeV/c, in three kinematic regions (1) Mx < 1.7 GeV/c2, (2) Mx < 1.7 GeV/c2 combined with q2 > 8 GeV2/c2, and by (3) P+ < 0.66 GeV/c. The matrix element /Vub/ is found to be (4.09 +/- 0.19 +/- 0.20(+0.14) -0.15 +/- 0.18) x 10(-3), where the errors are statistical, systematic including Monte Carlo modeling, theoretical, and from shape function parameter determination, respectively.

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