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.

13 pages, 3 figures

References in corpus (2)

• Big-Bang Nucleosynthesis
• Strong Phase and $D^0-D^{0}bar$ mixing at BES-III

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