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http://bura.brunel.ac.uk/handle/2438/19593
Title: | Measurement of the B --> Xs l+ l- Branching Fraction Using a Sum over Exclusive Modes |
Authors: | Collaboration, TBABAR Aubert, B Kyberd, P |
Issue Date: | 7-Aug-2003 |
Publisher: | ArXiv |
Citation: | ArXiv, 2003, pp. 1 - 18 |
Abstract: | We present a measurement of the branching fraction for the flavor-changing neutral current process B --> Xs l+ l- based on a sample of 88.9 \times 10^6 Upsilon(4S) --> BBbar events recorded with the BaBar detector at the PEP-II e+e- storage ring. The final state is reconstructed from pairs of electrons or muons and a hadronic system consisting of one K+/- or K0s and up to two pions, with at most one pi0. Summing over both lepton flavors, we observe a signal of 41 +/- 10(stat) +/- 2(syst) events with a statistical significance of 4.6 sigmas. The inclusive branching fraction is determined to be BF(B --> Xs l+ l-) = [6.3 +/- 1.6(stat) +1.8 -1.5(syst)] 10^{-6} for m(l+ l-) > 0.2 GeV/c^2. All results are preliminary. |
URI: | http://bura.brunel.ac.uk/handle/2438/19593 |
ISSN: | 2331-8422 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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