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Measurement of the B→Xsℓ+ℓ− branching fraction and search for direct CP violation from a sum of exclusive final states
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BaBar Collaboration (Including: Gershon, T. J., Harrison, P. F. and Latham, Thomas). (2014) Measurement of the B→Xsℓ+ℓ− branching fraction and search for direct CP violation from a sum of exclusive final states. Physical Review Letters, Volume 112 . Article number 211802. doi:doi: 10.5606/tgkdc.dergisi.2013.6683 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.112.211802
Abstract
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.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | Physical Review Letters | ||||||
Publisher: | American Physical Society | ||||||
ISSN: | 0031-9007 | ||||||
Official Date: | 30 May 2014 | ||||||
Dates: |
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Volume: | Volume 112 | ||||||
Article Number: | Article number 211802 | ||||||
DOI: | doi: 10.5606/tgkdc.dergisi.2013.6683 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access |
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