Determination of theD0→K−π+π0andD0→K−π+π+π−coherence factors and average strong-phase differences using quantum-correlated measurements

2009/03/31 by CLEO Collaboration, N. Lowrey, S. Mehrabyan +98
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1103/physrevd.80.031105

published as Phys.Rev.D80:031105,2009 · 14 pages, available through http://www.lns.cornell.edu/public/CLNS/, submitted to PRD-RC

arxiv created 2009/08/07 · openalex publication_date 2009/08/26 · arxiv updated 2010/04/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The first measurements of the coherence factors (R_K\ensuremathπ\ensuremathπ⁰ and R_K3\ensuremathπ) and the average strong-phase differences (\ensuremathδ_D^K\ensuremathπ\ensuremathπ⁰ and \ensuremathδ_D^K3\ensuremathπ) for D⁰\ensuremath→K^\ensuremath-\ensuremathπ⁺\ensuremathπ⁰ and D⁰\ensuremath→K^\ensuremath-\ensuremathπ⁺\ensuremathπ⁺\ensuremathπ^\ensuremath- are presented. These parameters can be used to improve the determination of the unitarity triangle angle \ensuremathγ in B^\ensuremath-\ensuremath→DK^\ensuremath- decays, where D is a D⁰ or D⁰ meson decaying to the same final state. The measurements are made using quantum-correlated, fully reconstructed D⁰D⁰ pairs produced in e⁺e^\ensuremath- collisions at the \ensuremathψ(3770) resonance. The measured values are: R_K\ensuremathπ\ensuremathπ⁰=0.84\ifmmode±\else\textpm\fi0.07, \ensuremathδ_D^K\ensuremathπ\ensuremathπ⁰=(227_\ensuremath-17⁺¹⁴)\ifmmode^∘\else\textdegree\fi, R_K3\ensuremathπ=0.33_\ensuremath-0.23^+0.20, and \ensuremathδ_D^K3\ensuremathπ=(114_\ensuremath-23⁺²⁶)\ifmmode^∘\else\textdegree\fi. These results indicate significant coherence in the decay D⁰\ensuremath→K^\ensuremath-\ensuremathπ⁺\ensuremathπ⁰, whereas lower coherence is observed in the decay D⁰\ensuremath→K^\ensuremath-\ensuremathπ⁺\ensuremathπ⁺\ensuremathπ^\ensuremath-. The analysis also results in a small improvement in the knowledge of other D-meson parameters, in particular, the strong-phase difference for D⁰\ensuremath→K^\ensuremath-\ensuremathπ⁺, \ensuremathδ_D^K\ensuremathπ, and the mixing parameter y.

Citations

• Review of Particle Physics
• Measurement of time-dependent CP asymmetry in B0→cc K(*)0 decays
• Observation of Time-DependentCPViolation inB0→η′K0Decays and Improved Measurements ofCPAsymmetries inB0→φK0,KS0KS0KS0andB0→J/ψK0Decays
• CP-Violation in the Renormalizable Theory of Weak Interaction