We measure the branching fraction for the flavor-changing neutral-current process B→Xsℓ+ℓ- with a sample of 89×10^6 Υ(4S)→BB̅ events recorded with the BABAR detector at the PEP-II e+e- storage ring. The final state is reconstructed from e+e- or μ+μ- pairs and a hadronic system Xs consisting of one K± or KS0 and up to two pions, with at most one π0. We observe a signal of 40±10(stat)±2(syst) events and extract the inclusive branching fraction B(B→Xsℓ+ℓ-)=(5.6±1.5(stat)±0.6(exp syst)±1.1(model syst))×10^-6 for mℓ+ℓ->0.2 GeV/c2.
Measurement of the B -> Xs l+ l- branching fraction with a sum over exclusive modes
BOREAN, CRISTIANO;BOSISIO, LUCIANO;CARTARO, CONCETTA;DELLA RICCA, GIUSEPPE;DITTONGO, SELENIA;GRANCAGNOLO, SERGIO;LANCERI, LIVIO;POROPAT, PAOLO;VITALE, LORENZO;VUAGNIN, GLORIA
2004-01-01
Abstract
We measure the branching fraction for the flavor-changing neutral-current process B→Xsℓ+ℓ- with a sample of 89×10^6 Υ(4S)→BB̅ events recorded with the BABAR detector at the PEP-II e+e- storage ring. The final state is reconstructed from e+e- or μ+μ- pairs and a hadronic system Xs consisting of one K± or KS0 and up to two pions, with at most one π0. We observe a signal of 40±10(stat)±2(syst) events and extract the inclusive branching fraction B(B→Xsℓ+ℓ-)=(5.6±1.5(stat)±0.6(exp syst)±1.1(model syst))×10^-6 for mℓ+ℓ->0.2 GeV/c2.File in questo prodotto:
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