Measurement of y(cp) in d-0-(d)over-bar(0) oscillation using quantum correlations in e(+)e(-) -> d-0(d)over-bar(0) at root s=3.773 Gev
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KünyeAblikim, M., Achasov, M. N., Ai, X. C., Albayrak, O., Albrecht, M., Ambrose, D. J. ... BESIII Collaboration. (2015). Measurement of y(cp) in d-0-(d)over-bar(0) oscillation using quantum correlations in e(+)e(-) -> d-0(d)over-bar(0) at root s=3.773 Gev. Physics Letters B. Volume 744, 339-346. http://dx.doi.org/10.1016/j.physletb.2015.04.008
We report a measurement of the parameter y(CP) in D-0-(D) over bar (0) oscillations performed by taking advantage of quantum coherence between pairs of D-0(D) over bar (0) mesons produced in e(+)e(-) annihilations near threshold. In this work, doubly-tagged D-0(D) over bar (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 root s = 3.773 GeV. We obtain y(CP) = (-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. (C) 2015 The Authors.