Measurement of D0-D0bar mixing in D0->Ks pi+ pi- decays

Abstract

We report a measurement of D0-D0bar mixing in D0->Ks pi+ pi- decays using a time-dependent Dalitz plot analysis. We first assume CP conservation and subsequently allow for CP violation. The results are based on 540 fb${}^{-1}$ of data accumulated with the Belle detector at the KEKB $e^{+}{e}^{-}$ collider. Assuming negligible CP violation, we measure the mixing parameters $x=(0.80\pm 0.29_{-0.07-0.14}^{+0.09+0.10})$ and $y=(0.33\pm 0.24_{-0.12-0.08}^{+0.08+0.06})$, where the errors are statistical, experimental systematic, and systematic due to the Dalitz decay model, respectively. Allowing for CP violation, we obtain the $CPV$ parameters $|q/p|=0.86_{-0.29-0.03}^{+0.30+0.06}\pm 0.08$ and $\arg (q/p)=(-14_{-18-3-4}^{+16+5+2}{)}^{\circ }$.

6 pages, 4 figures, Submitted to Physical Review Letters