Measurement of the Semileptonic CP Asymmetry in B[superscript 0] - [bar over B][superscript 0] Mixing
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PhysRevLett.114.041601.pdf
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Affolder, A.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Ali, S.
Date Issued
January 2015
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R. et al. “Measurement of the Semileptonic CP Asymmetry in B[superscript 0] - [bar over B][superscript 0] Mixing.” Physical Review Letters 114.4 (2015): 041601-1-041601-9
Version
Final published version
Abstract
The semileptonic CP asymmetry in B [superscript 0] - [bar over B][superscript 0] mixing, a[d over sl], is measured in proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb[superscript -1], recorded by the LHCb experiment. Semileptonic B[superscript 0] decays are reconstructed in the inclusive final states D[superscript -] μ[superscript +] and D*[superscript -] μ[superscript +], where the D[superscript -] meson decays into the K[superscript +]π[superscript -]π[superscript -] final state and the D*[superscript -] meson into the [bar over D][superscript 0](→K[superscript +]π[superscript -])π[superscript -] final state. The asymmetry between the numbers of D[superscript (*) -] μ[superscript +] and D[superscript (*)+] μ[superscript -] decays is measured as a function of the decay time of the B[superscript 0] mesons. The CP asymmetry is measured to be a[d over sl] = (-0.02±0.19±0.30)%, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of a[d over sl] to date and is consistent with the prediction from the standard model.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.114.041601
