The use of quantum-correlated D^0 decays for phi3 measurement

TL;DR

This study explores a Monte Carlo-based method for measuring the CKM angle phi3 using Dalitz plot analysis of D0 decays, aiming for a model-independent approach with optimal data utilization.

Contribution

It proposes a binned analysis strategy for B->DK and psi(3770) decays that achieves precision comparable to traditional unbinned methods, enhancing model independence.

Findings

CP-tagged D meson decays alone are insufficient for model-independent phi3 measurement with limited data.

Binned analysis of B->DK and psi(3770) decays can reach similar precision as unbinned fits.

The proposed method improves the robustness of phi3 extraction in experimental scenarios.

Abstract

We report the results of the Monte-Carlo study of the method to determine the CKM angle phi3 using Dalitz plot analysis of D0 decay from B->DK process. Our main goal is to find the optimal strategy for a model-independent phi3 extraction. We find that the analysis using decays of CP-tagged D mesons only cannot provide a completely model-independent measurement in the case of limited data sample. The procedure involving binned analysis of B->DK and psi(3770)->(K0 pi+ pi-)_D (K0 pi+ pi-)_D decays is proposed, that allows to reach the phi3 precision comparable to unbinned model-dependent fit.