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We report the first measurement of the branching fraction for the inclusivedecay B --> X(s) l+ l-, where l is either an electron or a muon and X(s) is ahadronic recoil system that contains an s-quark. We analyzed a data sample of65.4 * 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.Comment: 10 pages, 2 figures, to be published in Phys.Rev.Let

physical review letters

Measurement of the Electroweak Penguin Process<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo>→</mml:mo><mml:msub><mml:mi>X</mml:mi><mml:mi>s</mml:mi></mml:msub><mml:msup><mml:mi>ℓ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>ℓ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>

Measurement of the Electroweak Penguin ProcessB→Xsℓ+ℓ−