Model-independent measurement of $D^0$-$\overline{D}{}^0$ mixing parameters in $D^0\to K_S^0{\pi }^{+}{\pi }^{-}$ decays at Belle and Belle II

Abstract

We perform a model-independent measurement of the $D^0$-$\overline{D}{}^0$ mixing parameters using samples of $e^{+}{e}^{-}$-collision data collected by the Belle and Belle II experiments that have integrated luminosities of $951{\text{fb}}^{-1}$ and $408{\text{fb}}^{-1}$, respectively. Approximately $2.05\times 10^6$ neutral $D$ mesons are reconstructed in the $D^0\to K_S^0{\pi }^{+}{\pi }^{-}$ channel, with the neutral $D$ flavor tagged by the charge of the pion in the $D^{\ast +}\to D^0{\pi }^{+}$ decay. Assuming charge-parity symmetry, the mixing parameters are measured to be $x=(4.0\pm 1.7\pm 0.4)\times 10^{-3}$ and $y=(2.9\pm 1.4\pm 0.3)\times 10^{-3}$, where the first uncertainties are statistical and the second systematic. The results are consistent with previous determinations.

References in corpus (35)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• An Introduction to PYTHIA 8.2
• Determining $\gamma$ using $B^{\pm }\to D{K}^{\pm }$ with multibody D decays
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Flavor Physics Constraints for Physics Beyond the Standard Model
• SuperKEKB Collider
• Evidence for D0-anti-D0 Mixing
• The Belle II Core Software
• Model-independent determination of the strong-phase difference between D^0 and D^0-bar-> K^0_S,L h^+ h^- (h=pi,K) and its impact on the measurement of the CKM angle gamma/phi_3
• Measurement of D0-D0bar mixing in D0->Ks pi+ pi- decays
• Measurement of D0-antiD0 mixing parameters using D0 -> K0S pi+ pi- and D0 -> KS0 K+ K- decays
• Improved measurement of the CKM angle gamma in B^-+ -> D^(*) K^(*)-+ decays with a Dalitz plot analysis of D decays to K_S^0 pi^+ pi^- and K_S^0 K^+ K^-
• Dalitz Analysis of D^0 --> K_S^0 pi+ pi-
• Feasibility study of model-independent approach to phi_3 measurement using Dalitz plot analysis
• Observation of D0-D0bar oscillations
• The use of quantum-correlated D^0 decays for phi3 measurement
• Search for D^0 - barD^0 Mixing in the Dalitz Plot Analysis of D^0 --> K_S^0 pi^+ pi^-
• First Measurements of Beam Backgrounds at SuperKEKB
• Model-independent determination of the relative strong-phase difference between $D^0$ and ${\bar{D}}^0\to K_{S,L}^0{\pi }^{+}{\pi }^{-}$ and its impact on the measurement of the CKM angle $\gamma /{\varphi }_3$
• Charm mixing in the model-independent analysis of correlated D0-D0bar decays
• Observation of the mass difference between neutral charm-meson eigenstates
• B2BII - Data conversion from Belle to Belle II
• Measurement of $D^0$-$\overline{D}{}^0$ Mixing and Search for Indirect $CP$ Violation Using $D^0\to K_S^0{\pi }^{+}{\pi }^{-}$ Decays
• Global Decay Chain Vertex Fitting at B-Factories
• Mixing and $CP$ violation in the charm system
• Observation of D0-D0bar Mixing using the CDF II Detector
• Determination of strong-phase parameters in $D\to K_{S,L}^0{\pi }^{+}{\pi }^{-}$
• Updated determination of $D^0$-$\overline{D}{}^0$ mixing and CP violation parameters with $D^0\to K^{+}{\pi }^{-}$ decays
• Observation of $D^0-{\bar{D}}^0$ Mixing in $e^{+}{e}^{-}$ Collisions
• Search for time-dependent $CP$ violation in $D^0\to K^{+}{K}^{-}$ and $D^0\to {\pi }^{+}{\pi }^{-}$ decays
• Measured and projected beam backgrounds in the Belle II experiment at the SuperKEKB collider
• Measurement of the integrated luminosity of data samples collected during 2019-2022 by the Belle II experiment
• Model-independent $D^0-\overline{D^0}$ mixing and CP violation studies with $D^0\to K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$ and $D^0\to K_{\mathrm{S}}^0{K}^{+}{K}^{-}$
• Measurement of the charm mixing parameter $y_{CP}-y_{CP}^{K\pi }$ using two-body $D^0$ meson decays