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Measurement of the electroweak penguin process B-->X(s)l+l- |
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| Authors: | Kaneko J Abe K Abe K Abe T Adachi I Ahn Byoung Sup Aihara H Akatsu M Asano Y Aso T Aulchenko V Aushev T Bakich A M Ban Y Banas E Bartel W Bay A Behera P K Bondar A Bozek A Bracko M Brodzicka J Browder T E Casey B C K Chang P Chao Y Chen K-F Cheon B G Chistov R Choi Y Choi Y K Danilov M Dong L Y Eidelman S Eiges V Enari Y Everton C W Fang F Fujii H Fukunaga C Gabyshev N Garmash A Gershon T Guo R Haba J Handa F Hara T Harada Y Hastings N C Hayashii H Hazumi M Heenan E M Higuchi I Higuchi T Hinz L Hojo T Hoshi Y Hou W-S Huang H-C Igaki T Igarashi Y Iijima T Inami K Ishikawa A Ishino H Itoh R |
| Institution: | Tokyo Institute of Technology, Tokyo. |
| 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 x 10(6) B meson pairs collected with the Belle detector at the KEKB e(+)e(-) asymmetric-energy collider. We find B(B-->X(s)l(+)l(-))=6.1 +/-1.4(stat) +1.4-1.1(syst)] x 10(-6) for dilepton masses greater than 0.2 GeV/c(2). |
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