Abstract
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.
Highlights
It is well known that oscillations between meson and antimeson, called mixing, can occur when the flavor eigenstates differ from the physical mass eigenstates
The analysis presented in this paper is based on a data sample with an integrated luminosity of 2.92 fb−1 [23] collected√with the BESIII detector [24] at the center-of-mass energy of s = 3.773 GeV
We briefly describe the components of BESIII from the interaction point (IP) outwards
Summary
It is well known that oscillations between meson and antimeson, called mixing, can occur when the flavor eigenstates differ from the physical mass eigenstates. These effects provide a mechanism whereby interference in the transition amplitudes of mesons and antimesons may occur. It is important to access the mixing parameters x and y directly to provide complementary constraints In this analysis, we use a time-integrated method to extract yCP , as proposed in the references [19,20,21,22], which uses threshold D0 D0 pair production in e+e− → γ ∗ → D0 D0. The method utilizes the semileptonic decays of D meson and avoids the complications from hadronic effects in D decays, provides a clean and unique way to probe the D0–D0 oscillation
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