Determination of the Strong Phase in D0 -> K+pi- Using Quantum-Correlated Measurements

الأصل · EN

We exploit the quantum coherence between pair-produced D0 and D0bar in psi(3770) decays to study charm mixing, which is characterized by the parameters x and y, and to make a first determination of the relative strong phase δbetween D0 -> K+pi- and D0bar -> K+pi-. Using 281 pb-1 of e+e- collision data collected with the CLEO-c detector at Ecm = 3.77 GeV, as well as branching fraction input and time-integrated measurements of Rₘ = (x²+y²)/2 and RWS = Gamma(D0 -> K+pi-)/Gamma(D0bar -> K+pi-) from other experiments, we find δ= 1.03 +0.31-0.17 +- 0.06, where the uncertainties are statistical and systematic, respectively. By further including other mixing parameter measurements, we obtain an alternate measurement of δ= 1.10 +- 0.35 +- 0.07, as well as xδ= (4.4 +2.7-1.8 +- 2.9) x 10-3 and δ= 22 +11-12 +9-11 degrees.