2014•arXiv (Cornell University)Open access

Charm CP violation and mixing at Belle

B. R. Ko

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Abstract

We present charm CP violation and mixing measurements at Belle. They are the first observation of $D^0-\bar{D}^0$ mixing in $e^+e^-$ collisions from $D^0\rightarrow K^+π^-$ decays, the most precise mixing and indirect CP violation parameters from $D^0\rightarrow K^0_Sπ^+π^-$ decays, and the time-integrated CP asymmetries in $D^0\rightarrowπ^0π^0$ and $D^0\rightarrow K^0_Sπ^0$ decays. Our mixing measurement in $D^0\rightarrow K^+π^-$ decays excludes the no-mixing hypothesis at the 5.1 standard deviation level. The mixing parameters $x=(0.56\pm0.19^{+0.03+0.06}_{-0.09-0.09})%$, $y=(0.30\pm0.15^{+0.04+0.03}_{-0.05-0.06})%$ and indirect CP violation parameters $|q/p|=(0.90^{+0.16+0.05+0.06}_{-0.15-0.04-0.05})$, arg$(q/p)=(-6\pm11\pm3^{+3}_{-4})^{\circ}$ measured from $D^0\rightarrow K^0_Sπ^+π^-$ decays, and the time-integrated CP asymmetries $A^{D^0\rightarrowπ^0π^0}_{CP}=(-0.03\pm0.64\pm0.10)%$ and $A^{D^0\rightarrow K^0_Sπ^0}_{CP}=(-0.21\pm0.16\pm0.07)%$ are the most precise measurements to date. Our measurements here are consistent with predictions of the standard model.

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We present charm CP violation and mixing measurements at Belle. They are the first observation of $D^0-\bar{D}^0$ mixing in $e^+e^-$ collisions from $D^0\rightarrow K^+π^-$ decays, the most precise mixing and indirect CP violation parameters from $D^0\rightarrow K^0_Sπ^+π^-$ decays, and the time-integrated CP asymmetries in $D^0\rightarrowπ^0π^0$ and $D^0\rightarrow K^0_Sπ^0$ decays. Our mixing measurement in $D^0\rightarrow K^+π^-$ decays excludes the no-mixing hypothesis at the 5.1 standard deviation level. The mixing parameters $x=(0.56\pm0.19^{+0.03+0.06}_{-0.09-0.09})%$, $y=(0.30\pm0.15^{+0.04+0.03}_{-0.05-0.06})%$ and indirect CP violation parameters $|q/p|=(0.90^{+0.16+0.05+0.06}_{-0.15-0.04-0.05})$, arg$(q/p)=(-6\pm11\pm3^{+3}_{-4})^{\circ}$ measured from $D^0\rightarrow K^0_Sπ^+π^-$ decays, and the time-integrated CP asymmetries $A^{D^0\rightarrowπ^0π^0}_{CP}=(-0.03\pm0.64\pm0.10)%$ and $A^{D^0\rightarrow K^0_Sπ^0}_{CP}=(-0.21\pm0.16\pm0.07)%$ are the most precise measurements to date. Our measurements here are consistent with predictions of the standard model.

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Available abstract

We present charm CP violation and mixing measurements at Belle. They are the first observation of $D^0-\bar{D}^0$ mixing in $e^+e^-$ collisions from $D^0\rightarrow K^+π^-$ decays, the most precise mixing and indirect CP violation parameters from $D^0\rightarrow K^0_Sπ^+π^-$ decays, and the time-integrated CP asymmetries in $D^0\rightarrowπ^0π^0$ and $D^0\rightarrow K^0_Sπ^0$ decays. Our mixing measurement in $D^0\rightarrow K^+π^-$ decays excludes the no-mixing hypothesis at the 5.1 standard deviation level. The mixing parameters $x=(0.56\pm0.19^{+0.03+0.06}_{-0.09-0.09})%$, $y=(0.30\pm0.15^{+0.04+0.03}_{-0.05-0.06})%$ and indirect CP violation parameters $|q/p|=(0.90^{+0.16+0.05+0.06}_{-0.15-0.04-0.05})$, arg$(q/p)=(-6\pm11\pm3^{+3}_{-4})^{\circ}$ measured from $D^0\rightarrow K^0_Sπ^+π^-$ decays, and the time-integrated CP asymmetries $A^{D^0\rightarrowπ^0π^0}_{CP}=(-0.03\pm0.64\pm0.10)%$ and $A^{D^0\rightarrow K^0_Sπ^0}_{CP}=(-0.21\pm0.16\pm0.07)%$ are the most precise measurements to date. Our measurements here are consistent with predictions of the standard model.

Key concepts: Physics, Particle physics, CP violation, Mixing (physics), Charm (quantum number), Bar (unit), Pi, Standard Model (mathematical formulation)

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