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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

Author(s)
Counts, Ian Thomas Hunt; Williams, Michael; Ilten, Philip J
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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.
Date issued
2015-04
URI
http://hdl.handle.net/1721.1/97161
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
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
ISSN
1029-8479
1126-6708

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