Measurement of CP asymmetry in D[superscript 0] → K[superscript −]K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] decays
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Author(s)
Counts, Ian Thomas Hunt
Williams, Michael
Ilten, Philip J
Date Issued
July 2014
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, et al. “Measurement of CP asymmetry in D[superscript 0] → K[superscript −]K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] decays.” J. High Energ. Phys. 2014, no. 7 (July 2014). © CERN,
for the benefit of the LHCb Collaboration
Version
Final published version
Abstract
Time-integrated CP asymmetries in D [superscript 0] decays to the final states K [superscript −] K [superscript +] and π [superscript −] π [superscript +] are measured using proton-proton collisions corresponding to 3 fb[superscript −1] of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. 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 flavour of the charm meson. The difference in CP asymmetries between the two final states is measured to be ΔA[subscript CP] =A[subscript CP](K[superscript −]K[superscript +]) − A[subscript CP](π[superscript −]π[superscript +]) = (+0.14 ± 0.16 (stat) ± 0.08(syst))%. A measurement of A [subscript CP] (K [superscript −] K [superscript +]) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D decays. It is found to be A[superscript CP](K[superscript −]K[superscript +]) = (−0.06 ± 0.15(stat) ± 0.10(syst))%, where the correlation coefficient between ΔA [subscript CP] and A [subscript CP] (K [superscript −] K [superscript +]) is ρ = 0.28. By combining these results, the CP asymmetry in the D [superscript 0] → π [superscript −] π [superscript +] channel is A [subscript CP] (π [superscript −] π [superscript +]) = (−0.20 ± 0.19 (stat) ± 0.10 (syst))%.
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/JHEP07(2014)041
