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Measurement of /V(ub)/ using inclusive B-->X(u)lnu decays with a novel X(u)-reconstruction method |
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| Authors: | Kakuno H Abe K Abe K Adachi I Aihara H Asano Y Aso T Aulchenko V Aushev T Bakich A M Ban Y Banerjee S Bizjak I Bondar A Bozek A Bracko M Browder T E Chao Y Cheon B G Chistov R Choi S-K Choi Y Choi Y K Chuvikov A Cole S Danilov M Dash M Dong L Y Dragic J Drutskoy A Eidelman S Eiges V Gabyshev N Garmash A Gershon T Gokhroo G Golob B Haba J Hagner C Hara T Hazumi M Higuchi I Hinz L Hokuue T Hoshi Y Hou W-S Huang H-C Iijima T Inami K Ishikawa A Itoh R Iwasaki H Iwasaki Y Kang J H Kang J S Kapusta P Katayama N Kawai H Kawasaki T Kichimi H Kim H J Kim J H Kinoshita K Korpar S Krizan P Krokovny P |
| Institution: | Tokyo Institute of Technology, Tokyo. |
| Abstract: | We report the measurement of an inclusive partial branching fraction for charmless semileptonic B decay and the extraction of /V(ub)/. Candidates for B-->X(u)lnu are identified with a novel X(u) reconstruction method based on neutrino reconstruction via missing 4-momentum and a technique called "simulated annealing." Based on 86.9 fb(-1) of data taken with the Belle detector, we obtain DeltaB(B-->X(u)lnu;M(X)<1.7 GeV/c2,q2>8.0 GeV2/c2)=7.37+/-0.89(stat)+/-1.12(syst)+/-0.55(b-->c)+/-0.24(b-->u)]x10(-4) and determine |V(ub)|=4.66+/-0.28(stat)+/-0.35(syst)+/-0.17(b-->c)+/-0.08(b-->u)+/-0.58(theory)]x10(-3). |
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