Measurement of the Electroweak Penguin Process B --> X(s) l+ l-

Abstract

We report the first measurement of the branching fraction for the inclusive decay B --> X(s) l+ l-, where l is either an electron or a muon and X(s) is a hadronic recoil system that contains an s-quark. We analyzed a data sample of 65.4 * 10**6 B meson pairs collected with the Belle detector at the KEKB e+e- asymmetric-energy collider. We find Br(B --> X(s) l+ l-) = (6.1 +/-1.4(stat) +1.4-1.1(syst)) * 10**(-6) for dilepton masses greater than 0.2 GeV/c**2.

arXiv comment10 pages, 2 figures, to be published in Phys.Rev.Lett

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• Present Status of Inclusive Rare B Decays
• Measurement of the B -> Xs l+ l- branching fraction with a sum over exclusive modes
• Improved Measurement of the Electroweak Penguin Process B->Xsll
• Complete NNLO QCD Analysis of B -> X_s l^+ l^- and Higher Order Electroweak Effects
• The Impact of Universal Extra Dimensions on B -> X_s gamma, B -> X_s gluon, B -> X_s mu^+ mu^-, K_L -> pi^0 e^ +e^-, and epsilon'/epsilon
• b-physics signals of the lightest CP-odd Higgs in the NMSSM at large tan beta
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• Flavor Changing Neutral Currents involving Heavy Quarks with Four Generations
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• B meson Dileptonic Decays in NMSSM with a Light CP-odd Higgs Boson
• Virtual- and bremsstrahlung corrections to b -> d l+ l- in the standard model
• Beautiful Mirrors, Unification of Couplings and Collider Phenomenology
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• New physics effects on the CP asymmetries in B -> phi K_S and B -> eta' K_S decays
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• General analysis of CP violation in polarized (b -> d l^+ l^-) decay
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• Large Direct CP Violation in B -> phi phi Xs Decays
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• B-meson signatures of a Supersymmetric U(2) flavor model
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• Implication of the HyperCP boson $X^0$ (214 MeV) in the flavour changing neutral current processes