Abstract
We study D0D‾0 pairs produced in e+e− collisions at s=3.773GeV using a data sample of 2.92fb−1 collected with the BESIII detector. Using world-average values of external parameters, we obtain cosδKπ=1.02±0.11±0.06±0.01, δKπ is the strong phase difference between the doubly Cabibbo-suppressed process D‾0→K−π+ and the Cabibbo-favored process D0→K−π+. A measurement of the parameter yCP in D0−D‾0 oscillations is performed by taking advantage of quantum coherence between pair-produced D0 and D‾0 mesons near threshold, the preliminary result is yCP=(−1.6±1.3±0.6)%. An analysis of the D+→KS0π+π0 Dalitz plot is performed, the Dalitz plot is found to be well presented by a combination of six quasi-two-body decay channels [KS0ρ+, KS0ρ(1450)+, K‾⁎0π+, K‾0(1430)0π+, K‾(1680)0π+, κ‾0π+] plus a small nonresonant component. Using the fit fractions from this analysis, partial branching ratios are updated with higher precision than previous measurements.
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