Measurement of|Vub|from Inclusive Charmless SemileptonicBDecays

P Urquijo,D Liventsev,S Eidelman,M Shapkin,C H Wang,T E Browder,S Okuno,O Schneider,M J Lee,Y Miyazaki,C Schwanda,S Uno,K Belous,R Mizuk,R Pestotnik,D H Kah,H Hayashii,T Ohshima,Y Hoshi,H Miyata,W Dungel,K Arinstein,M Bračko,M E Sevior,T Iijima,S Mconie,K Sumisawa,A Chen,Y Teramoto,K Vervink,Y Yamashita,Y Choi,N Gabyshev,L E Piilonen,M Bischofberger,K Nishimura,R Seidl,O Nitoh,K Kinoshita,H Ozaki,K Trabelsi,W Ostrowicz,H Sahoo,T Kuhr,I Adachi,J H Kang,Y Watanabe,J Dalseno,A Matyja,T Nozaki,B Golob,G N Taylor,T Uglov,A Zupanc,H Ha,S Nishida,R Chistov,B Shwartz,K S Park,T Lesiak,R Louvot,A Ishikawa,A Kuzmin,Y Sakai,Z P Zhang,S Ogawa,S Uehara,A M Bakich,M Iwasaki,N Katayama,E Won,K Inami,H Kawai,F Mandl,H J Hyun,O Zyukova,G Pakhlova,B R Ko,P Krokovny,K Senyo,V Bhardwaj,R Itoh,J Haba,E Nakano,M Starič,P Goldenzweig,Z Natkaniec,M Nakao,T Kawasaki,P Križan,Y Chào ,Y Kwon ,J B Singh,E L Barberio ,Y Horii,T Živko ,Y Unno,Y J Kim,V Zhilich,K E Varvell,S E Lee,C W Park,W.-S Hou,G Varner,S H Lee ,A Bożek ,S K Kim,J G Shiu ,R Wedd,J H Kim,S H Kyeong ,V Zhulanov,Y Nagasaka,I S Cho ,P Wang,M Kreps,Anirban Das ,Y Hsiung ,B G Cheon,H Aihara,Takashi Mori ,J Li,S Stanič,C Liu,Y I Kim,M Dash,B Yabsley ,A Limosani,M Z Wang ,H O Kim,H K Park

doi:10.1103/physrevlett.104.021801

Abstract

We present the partial branching fraction for inclusive charmless semileptonic B decays and the corresponding value of the CKM matrix element |Vub|, using a multivariate analysis method to access ~90% of the B -> Xu l nu phase space. This approach dramatically reduces the theoretical uncertainties from the b-quark mass and non-perturbative QCD compared to all previous inclusive measurements. The results are based on a sample of 657 million B -Bbar pairs collected with the Belle detector. We find that Delta BR(B -> Xu l nu; p^*B_l>1.0 GeV/c=1.963 x (1 +/- 0.088(stat.) +/- 0.081(sys.)) x 10^-3. Corresponding values of |Vub| are extracted using several theoretical calculations.

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