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

We report a measurement of the parameter yCP in D0–D¯0 oscillations performed by taking advantage of quantum coherence between pairs of D0D¯0 mesons produced in e+e− annihilations near threshold. In this work, doubly-tagged D0D¯0 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 s=3.773 GeV . We obtain yCP=(−2.0±1.3±0.7)% , where the first uncertainty is statistical and the second is systematic. This result is compatible with the current world average.

Note:

13 pages, 3 figures

BESIII
D0–D¯0 oscillation
yCP
Quantum correlation
[formula omitted] oscillation
[formula omitted]
experimental results
D0 anti-D0: oscillation
CP: violation
pi+ pi-

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