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

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

2002-08-19

arxiv.org/abs/hep-ex/0208029v2

Phys.Rev.Lett.90:021801,2003

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevLett.90.021801

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.

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