Accurate measurement of the D0-D0bar mixing parameters

TL;DR

This paper introduces a new method to accurately measure D meson mixing parameters, including mass, width differences, and CP violation, by combining time-dependent decay analyses of various D meson decay modes.

Contribution

The paper presents a novel approach to determine all D meson mixing and CP violation parameters using combined decay mode analyses, applicable for arbitrary CP violating phases.

Findings

Method allows precise measurement of mixing parameters.

Combining decay modes reduces parameter ambiguity.

Applicable to various D decay channels.

Abstract

We propose a new method to determine the mass and width differences of the two D meson mass-eigenstates as well as the CP violating parameters associated with D^0-\bar{D}^0 mixing. We show that an accurate measurement of all the mixing parameters is possible for an arbitrary CP violating phase, by combining observables from a time dependent study of D decays to a doubly Cabibbo suppressed mode with information from a CP eigenstate. As an example we consider D^0-> K^{*0} \pi^0 decays where the K^{*0} is reconstructed in both K^+\pi^- and K_S\pi^0. We also show that decays to the CP eigenstate D-> K^+K^- together with D-> K^+\pi^- can be used to extract all the mixing parameters. A combined analysis using D^0-> K^{*0} \pi^0 and D-> K^+K^- can also be used to reduce the ambiguity in the determination of parameters.