Measurement of the B → X[subscript s]ℓ[superscript +]ℓ[superscript −] Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States
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Lees-2014-Measurement of the B.pdf
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Author(s)
Dujmic, Denis
Sciolla, Gabriella
Cowan, Ray F
Date Issued
May 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Lees, J. P., V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, B. Stugu, et al. “Measurement of the B → X[subscript s]ℓ[superscript +]ℓ[superscript −] Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States.” Physical Review Letters 112, no. 21 (May 2014). © 2014 American Physical Society
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Final published version
Abstract
We measure the total branching fraction of the flavor-changing neutral-current process B → X[subscript s]ℓ[superscript +]ℓ[superscript −], along with partial branching fractions in bins of dilepton and hadronic system (X[subscript s]) mass, using a sample of 471 × 10[superscript 6] Υ(4S) → B[bar over B] 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 X[subscript s] final states. Extrapolating from a sum over these exclusive modes, we measure a lepton-flavor-averaged inclusive branching fraction B(B → X[subscript s]ℓ[superscript +]ℓ[superscript −]) = [6.73[+0.70 over −0.64](stat)[+0.34 over −0.25](exp syst) ± 0.50(model syst)] × 10[superscript −6] for m[2 over ℓ+ℓ−] > 0.1 GeV[superscript 2]/c[superscript 4]. 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 A[subscript CP] in bins of dilepton mass; over the full dilepton mass range, we find A[subscript CP] = 0.04 ± 0.11 ± 0.01 for a lepton-flavor-averaged sample.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.112.211802
