Determination of|Vub|from Measurements of the Inclusive Charmless Semileptonic Partial Rates ofBMesons using Full Reconstruction Tags

I Bizjak,M Yamauchi,A Bay,S Uehara,X C Tian,T Hara,H Shibuya,A Chuvikov,A Somov,S Villa,Y Asano,Z Natkaniec,B Shwartz,S Okuno,M Starič,T E Browder,N Gabyshev,Y Onuki,B Golob,T Schietinger,F Takasaki,O Schneider,J Haba,M Bračko,T Sumiyoshi,T Iijima,R Pestotnik,A Yamaguchi,K Senyo,A Garmash,N Soni,U Bitenc,B G Cheon,T Tsuboyama,E Nakano,R Kulasiri,T Matsumoto,Y Iwasaki,Y Sakai,F Fang,J H Kang,W Ostrowicz,S Korpar,N Parslow,T Lesiak,T Nagamine,A Drutskoy,C Schwanda,H Kawai,N Katayama,R Mizuk,T Ohshima,F Mandl,S Nishida,P Krokovny,T Tsukamoto,L S Peak,M Danilov,Y Hoshi,Z P Zhang,M E Sevior,S Fratina,S Eidelman,G Gokhroo,H Miyata,A Ishikawa,M Nakao,Y Watanabe,H Hayashii,H Kichimi,P Križan,P Pakhlov,A Chen,A Matyja,I Nakamura,S Cole,R Itoh,L Hinz,K Kinoshita,S Ogawa,D Liventsev,G Leder,J Macnaughton,T Okabe,T Uglov,K Inami,P Kapusta,Y Mikami,S Uno,T Hokuue,D Žontar,Y Choi,H Park,A Imoto,C H Wang,M Iwasaki,S L Olsen,L E Piilonen,Y Teramoto,A Kuzmin,R Chistov,J Dalseno,T Nozaki,H R Khan,K Ueno,T Kawasaki,K Tamai,K Miyabayashi,Y Yamashita,A M Bakich,H Miyake,O Nitoh,Y Ban,Y Nagasaka,J S Kang,A Limosani,H Sagawa,P Urquijo,A Bondar,G Majumder,W.-S Hou,V Zhilich,N Sato,Y Enari,K E Varvell,M Hazumi,H Aihara,J Li,C C Wang,H J Kim,C C Kuo,Qingguo Xie ,A Bożek ,M Różańska ,Suneel Kumar ,B Yabsley ,Y Kwon ,S K Choi ,E L Barberio ,Kazuo Abe ,Y Chào ,Dong Liu ,S W Lin ,H X Yang ,Shoji Suzuki ,N Tamura,R Stamen,P Schönmeier,T Gershon,V Sidorov,W T Chen,S E Lee,J Brodzicka,O Tajima,S Suzuki,S Bahinipati,S Hou,M Barbero,L M Zhang,M Tanaka,M Dash,W Mitaroff,S Stanič,S M Kim,G Varner,A Gorišek,S Blyth

doi:10.1103/physrevlett.95.241801

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.

Full Text