ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2015, vol. 744, p. 339-346
Measurement of y<inf>CP</inf> in D<sup>0</sup>-D<sup>0</sup> oscillation using quantum correlations in e<sup>+</sup>e<sup>-</sup> → D<sup>0</sup>D<sup>0</sup> at √s = 3.773 GeV
© 2015 The Authors. We report a measurement of the parameter y<inf>CP</inf> in D0-D-0 oscillations performed by taking advantage of quantum coherence between pairs of D0D-0 mesons produced in e<sup>+</sup>e<sup>-</sup> 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<sup>-1</sup> collected with the BESIII detector at the center-of-mass energy of s=3.773 GeV. We obtain y<inf>CP</inf>=(-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.