Improved measurement of the electroweak penguin process $B \to X_s l^+ l^-$

We present an improved measurement of the branching fraction for the electroweak penguin process B->Xsll, where l is an electron or a muon and Xs is a hadronic system containing an s-quark. The measurement is based on a sample of 152*10^6 Upsilon(4S) -> BB events collected with the Belle detector at the KEKB energy asymmetric e+e- collider. The Xs hadronic system is reconstructed from one K^{+-} or K^{0}_{S} and up to four pions, where at most one pion can be neutral. Averaging over both lepton flavors, the inclusive branching fraction is measured to be Br(B->Xsll)=(4.11+-0.83(stat)+0.85-0.81(syst))*10^{-6} for M_ll > 0.2GeV/c2.

13.20.He
14.40.Nd
12.15.Ji
14.65.Fy
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B: semileptonic decay
quark: strangeness

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Improved measurement of the electroweak penguin process B→Xsl+l−B \to X_s l^+ l^-B→Xs​l+l−

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Improved measurement of the electroweak penguin process $B \to X_s l^+ l^-$