Quantum-correlated D decays at CLEO-c

TL;DR

This paper reports measurements of strong-phase differences in neutral D meson decays using the CLEO-c dataset, providing essential inputs for precise determination of the CKM angle gamma in B meson decays.

Contribution

The study presents new measurements of strong-phase differences in D decays to K_S pi+ pi- and K_S K+ K- using quantum-correlated data, aiding CKM angle gamma determination.

Findings

Measured strong-phase differences in D decays to K_S pi+ pi- and K_S K+ K-

Provided inputs for CKM angle gamma extraction in B decays

Enhanced understanding of D meson decay dynamics

Abstract

The 818 fb^-1 dataset collected at the \psi(3770) resonance in the CLEO-c detector offers unique possibilities for measuring strong-phase differences in neutral D decays. We report results for D decays to K_S pi+ pi- and K_S K+ K-. The measurements require that both D mesons in the event are fully reconstructed, with one decaying to the signal mode of interest, and the other to a CP-eigenstate, or a flavour-specific state, or K_{S,L} h+ h- (h = pi or K). The strong-phase differences extracted from these decays are important inputs to the determination of the CKM angle gamma with B->D(K_S h+ h-)K decays.