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Measurement of y_(CP) in D⁰-overline{D}⁰ oscillation using quantum correlations in e^+e^-to D⁰overline{D}⁰ at sqrt{s} = 3.773\,GeV
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arxiv 1501.01378 v2 pith:JTDLZZLB submitted 2015-01-07 hep-ex
Measurement of y_(CP) in D⁰-overline{D}⁰ oscillation using quantum correlations in e^+e^-to D⁰overline{D}⁰ at sqrt{s} = 3.773\,GeV
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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 $y_{CP} = (-2.0\pm1.3\pm0.7)\%$, where the first uncertainty is statistical and the second is systematic. This result is compatible with the current world average.
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