• Medientyp: E-Artikel
  • Titel: Measurement of the $B\to {X}_{s}{\ell }^{+}{\ell }^{-}$ Branching Fraction and Search for Direct $CP$ Violation from a Sum of Exclusive Final States
  • Beteiligte: Lees, J. P. [Verfasser:in]; Poireau, V. [Verfasser:in]; Lee, M. J. [Verfasser:in]; Adametz, A. [Verfasser:in]; Uwer, U. [Verfasser:in]; Lacker, H. M. [Verfasser:in]; Dauncey, P. D. [Verfasser:in]; Mallik, U. [Verfasser:in]; Chen, C. [Verfasser:in]; Cochran, J. [Verfasser:in]; Meyer, W. T. [Verfasser:in]; Prell, S. [Verfasser:in]; Ahmed, H. [Verfasser:in]; Lynch, G. [Verfasser:in]; Gritsan, A. V. [Verfasser:in]; Arnaud, N. [Verfasser:in]; Davier, M. [Verfasser:in]; Derkach, D. [Verfasser:in]; Grosdidier, G. [Verfasser:in]; Le Diberder, F. [Verfasser:in]; Lutz, A. M. [Verfasser:in]; Malaescu, B. [Verfasser:in]; Roudeau, P. [Verfasser:in]; Stocchi, A. [Verfasser:in]; [...]
  • Erschienen: APS, 2014
  • Erschienen in: Physical review letters 112(21), 211802 (2014). doi:10.1103/PhysRevLett.112.211802
  • Sprache: Englisch
  • DOI: https://doi.org/10.1103/PhysRevLett.112.211802
  • ISSN: 1079-7114; 0031-9007
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  • Beschreibung: 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.
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