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- W2171868113 abstract "We present an improved measurement of the branching fraction for the electroweak penguin process B→Xsℓ+ℓ−, where ℓ is an electron or a muon and Xs is a hadronic system containing an s-quark. The measurement is based on a sample of 152×106 Υ(4S)→BB¯ events collected with the Belle detector at the KEKB energy asymmetric e+e− collider. The Xs hadronic system is reconstructed from one K± or KS0 and up to four pions, where at most one pion can be neutral. Averaging over both lepton flavors, the inclusive branching fraction is measured to be B(B→Xsℓ+ℓ−)=(4.11±0.83(stat)−0.81+0.85(syst))×10−6 for Mℓ+ℓ−>0.2 GeV/c2.Received 24 March 2005DOI:https://doi.org/10.1103/PhysRevD.72.092005©2005 American Physical Society" @default.
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