Measurement of $y_{CP}$ in $D^0-{\overline{D}}^0$ oscillation using quantum correlations in $e^{+}{e}^{-}\to D^0{\overline{D}}^0$ at $\sqrt{s}$ = 3.773\,GeV

Abstract

We report a measurement of the parameter $y_{CP}$ in $\ensuremath{D^0}\xspace-\ensuremath{\overline{D}^{0}}\xspace$ oscillations performed by taking advantage of quantum coherence between pairs of $\ensuremath{D^0}\xspace \ensuremath{\overline{D}^{0}}\xspace$ mesons produced in $e^{+}{e}^{-}$ annihilations near threshold. In this work, doubly-tagged $\ensuremath{D^0}\xspace \ensuremath{\overline{D}^{0}}\xspace$ events, where one $D$ decays to a $CP$ eigenstate and the other $D$ decays in a semileptonic mode, are reconstructed using a data sample of 2.92\,fb${}^{-1}$ collected with the BESIII detector at the center-of-mass energy of $\sqrt{s}$ = 3.773\,GeV. We obtain $y_{CP}=(-2.0\pm 1.3\pm 0.7)\%$, where the first uncertainty is statistical and the second is systematic. This result is compatible with the current world average.

arXiv comment13 pages, 3 figures

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• Dispersive and Absorptive CP Violation in $D^0-\overline{D^0}$ Mixing
• Measurement of e+e- --> D Dbar Cross Sections at the psi(3770) Resonance
• Measurement of D0-D0bar mixing and search for CP violation in D0 -> K+K-, pi+pi- decays with the full Belle data set
• Renormalisation scale setting for D-mixing
• Measurement of the absolute branching fractions for purely leptonic $D_s^{+}$ decays
• Observation of the Singly Cabibbo-Suppressed Decay $D^{+}\to \omega {\pi }^{+}$ and Evidence for $D^0\to \omega {\pi }^0$
• Search for $D^0\to \gamma \gamma$ and improved measurement of the branching fraction for $D^0\to {\pi }^0{\pi }^0$
• Time reversal symmetry violation in entangled pseudoscalar neutral charmed mesons
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