Updated measurement of decay-time-dependent CP asymmetries in D^{0}→K^{+}K^{-} and D^{0}→π^{+}π^{-} decays
Name
PhysRevD.101.012005.pdf
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383.54 KB
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Author(s)
Craik, Daniel C
Weisser, Constantin
Date Issued
January 2020
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aaij, R. et al. "Updated measurement of decay-time-dependent CP asymmetries in D^{0}→K+K− and D^{0}→π^{+}π^{−} decays." Physical Review D, 101, 1 (January 2020): 012005. © 2020 CERN, for the LHCb Collaboration
Version
Final published version
Abstract
A search for decay-time-dependent charge-parity (CP) asymmetry in D^{0}→K^{+}K^{-} and D^{0}→π^{+}π^{-} decays is performed at the LHCb experiment using proton-proton collision data recorded at a center-of-mass energy of 13 TeV, and corresponding to an integrated luminosity of 5.4 fb^{-1}. The D^{0} mesons are required to originate from semileptonic decays of b hadrons, such that the charge of the muon identifies the flavor of the neutral D meson at production. The asymmetries in the effective decay widths of D^{0} and D[over ¯]^{0} mesons are determined to be A_{Γ}(K^{+}K^{-})=(-4.3±3.6±0.5)×10^{-4} and A_{Γ}(π^{+}π^{-})=(2.2±7.0±0.8)×10^{-4}, where the uncertainties are statistical and systematic, respectively. The results are consistent with CP symmetry and, when combined with previous LHCb results, yield A_{Γ}(K^{+}K^{-})=(-4.4±2.3±0.6)×10^{-4} and A_{Γ}(π^{+}π^{-})=(2.5±4.3±0.7)×10^{-4}.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.101.012005
