Measurement of indirect CP asymmetries in D[superscript 0] → K[superscript −] K[superscript +] and D[superscript 0] → π[superscript −] π[superscript +] decays using semileptonic B decays
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Aaij-2015-Measurement of indir.pdf
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Author(s)
Counts, Ian Thomas Hunt
Williams, Michael
Ilten, Philip J
Date Issued
April 2015
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Measurement of Indirect CP Asymmetries in D[superscript 0] → K[superscript −] K[superscript +] and D[superscript 0] → π[superscript −] π[superscript +] Decays Using Semileptonic B Decays.” J. High Energ. Phys. 2015, no. 4 (April 2015). © 2015 CERN, for the benefit of the LHCb Collaboration
Version
Final published version
Abstract
Time-dependent CP asymmetries in the decay rates of the singly Cabibbo-suppressed decays D[superscript 0] → K[superscript −] K[superscript +] and D[superscript 0] → π[superscript −] π[superscript +] are measured in pp collision data corresponding to an integrated luminosity of 3.0 fb[superscript −1] collected by the LHCb experiment. The D[superscript 0] mesons are produced in semileptonic b-hadron decays, where the charge of the accompanying muon is used to determine the initial state as D[superscript 0] or [bar over D][superscript 0]. The asymmetries in effective lifetimes between D[superscript 0] and [bar over D][superscript 0] decays, which are sensitive to indirect CP violation, are determined to be
A[subscript Γ](K[superscript −]K[superscript +]) = (−0.134 ± 0.077[−0.026 over −0.034])%, A[subscript Γ](π[superscript −]π[superscript +]) = (−0.092 ± 0.145[−0.025 over −0.033])%,
where the first uncertainties are statistical and the second systematic. This result is in agreement with previous measurements and with the hypothesis of no indirect CP violation in D[superscript 0] decays.
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
https://doi.org/10.1007/jhep04(2015)043
