Measurements of D0-D0bar Mixing and Searches for CP Violation: HFAG Combination of all Data

TL;DR

This paper provides a comprehensive global analysis of D0-D0bar mixing and CP violation parameters, confirming significant mixing but no evidence of CP violation, based on combined experimental data.

Contribution

It presents the first world average values for mixing and CP violation parameters by performing a global fit to all relevant experimental measurements.

Findings

D0-D0bar mixing parameters x and y are significantly different from zero.

No evidence of CP violation was found in the parameters |q/p| and Arg(q/p).

Strong phase difference  is constrained to less than 45 degrees at 95% confidence level.

Abstract

We present world average values for D0-D0bar mixing parameters x and y, CP violation parameters |q/p| and Arg(q/p), and strong phase differences \delta and \delta_{K\pi\pi}. These values are calculated by the Heavy Flavor Averaging Group (HFAG) by performing a global fit to relevant experimental measurements. The results for x and y differ significantly from zero and are inconsistent with no mixing at the level of 6.7 sigma. The results for |q/p| and Arg(q/p) are consistent with no CP violation. The strong phase difference \delta is less than 45 degrees at 95% C.L.