Measurement of $D^{0} - {\bar{D}}^{0}$ Mixing Parameters in $D^{0} \to K_{s} π^{+} π^{-}$ Decays

We report a measurement of

D^{0} - {\bar{D}}^{0}

mixing parameters in

D^{0} \to K_{S}^{0} π^{+} π^{-}

decays using a time-dependent Dalitz-plot analysis. We first assume

C P

conservation and subsequently allow for

C P

violation. The results are based on

540 {fb}^{- 1}

of data accumulated with the Belle detector at the KEKB

e^{+} e^{-}

collider. Assuming negligible

C P

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

C P

violation, we obtain the

C P

-violating 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}) °

This publication has 14 references indexed in Scilit:

Measurement ofD0−D¯0Mixing Parameters inD0→Ksπ+π−Decays