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Measurements of |Vub| with Simultaneous Requirements on MX and q2 by Belle

2004/05/13 by Tadao Nozaki, Nozaki, Tadao
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex

paper · pdf · doi:10.48550/arxiv.hep-ex/0405022

Invited talk at 39th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 21-28 Mar 2004

arxiv created 2004/05/20 · arxiv updated 2009/12/01

Abstract

We report the measurement of an inclusive partial branching fraction for charmless semileptonic B decay and the extraction of |Vub|. Candidates for B-> Xu l nu are identified using a novel Xu-reconstruction method with simultaneous requirements on the hadronic recoil mass (MX) and the invariant mass squared of lepton-neutrino system (q2). Based on 86.9 fb-1 of data taken with the Belle detector, we obtain DeltaB(B->Xu l nu ; MX<1.7GeV, q2>8.0GeV2) = (7.37 +- 0.89(stat.) +- 1.12(syst.) +- 0.55(b ->c) +- 0.24(b->u)) x 10-4 and determine |Vub| = (4.66 +- 0.28(stat.) +- 0.35(syst.) +- 0.17(b->c) +- 0.08(b->u) +- 0.58(theory)) x 10-3.

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