BABAR Publications

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CONF-03/019 Measurement of the B -> X_sl+l- Branching Fraction Using a Sum over Exclusive Modes
Doc Type Conference Submissions
Record Created July 28, 2003
SLAC-PUB
SLAC-PUB-10100  No citations
Preprint # hep-ex/0308016
Topic Radiative Penguin Rare Semileptonic
Abstract 
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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 * 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.
Revisions and Files 1 revised July 28, 2003
File Date
Thumbnails		File Name File Type File Format File Size (Kb) Comments
07-AUG-2003 babar-conf-0319.pdf Paper (journal paper or conference submission by BABAR Collaboration) pdf 216.75
07-AUG-2003 babar-conf-0319.ps Paper (journal paper or conference submission by BABAR Collaboration) ps 731.40
07-AUG-2003 fig01.eps Figure or plot eps 231.28 Feynman diagrams for b -> s l+ l- transition
07-AUG-2003 fig02.eps Figure or plot eps 139.39 Distributions of mES for B -> Xs e+ e-, B -> Xs mu+ mu-, B -> Xs l+ l-, and B -> Xs e+/- mu -/+ candidates.
07-AUG-2003 fig03.eps Figure or plot eps 16.95 Distribution of hadronic mass for data and MC.
08-AUG-2003 mes xsll data.eps Figure or plot eps 38.38 mES distribution for B --> Xs l+ l- candidates (for e and mu combined)
Submitted To2003 International Symposium on Lepton and Photon Interactions at High Energies