This title appears in the Scientific Report :
2014
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevLett.112.211802 in citations.
Please use the identifier: http://hdl.handle.net/2128/8206 in citations.
Measurement of the $B\to {X}_{s}{\ell }^{+}{\ell }^{-}$ Branching Fraction and Search for Direct $CP$ Violation from a Sum of Exclusive Final States
Measurement of the $B\to {X}_{s}{\ell }^{+}{\ell }^{-}$ Branching Fraction and Search for Direct $CP$ Violation from a Sum of Exclusive Final States
We measure the total branching fraction of the flavor-changing neutral-current process B→Xsℓ+ℓ−, along with partial branching fractions in bins of dilepton and hadronic system (Xs) mass, using a sample of 471×106 Υ(4S)→BB¯ events recorded with the BABAR detector. The admixture of charged and neutral...
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Please use the identifier: http://hdl.handle.net/2128/8206 in citations.
We measure the total branching fraction of the flavor-changing neutral-current process B→Xsℓ+ℓ−, along with partial branching fractions in bins of dilepton and hadronic system (Xs) mass, using a sample of 471×106 Υ(4S)→BB¯ events recorded with the BABAR detector. The admixture of charged and neutral B mesons produced at PEP-II2 are reconstructed by combining a dilepton pair with 10 different Xs final states. Extrapolating from a sum over these exclusive modes, we measure a lepton-flavor-averaged inclusive branching fraction B(B→Xsℓ+ℓ−)=[6.73+0.70−0.64(stat)+0.34−0.25(exp syst)±0.50(model syst)]×10−6 for m2ℓ+ℓ−>0.1 GeV2/c4. Restricting our analysis exclusively to final states from which a decaying B meson’s flavor can be inferred, we additionally report measurements of the direct CP asymmetry ACP in bins of dilepton mass; over the full dilepton mass range, we find ACP=0.04±0.11±0.01 for a lepton-flavor-averaged sample. |