2017/05/31 by Hua-Yu Jiang, Fu-Sheng Yu, Qin Qin +2 · 40 citations
Physics and Astronomy · #Amplitude #Bar (unit) #Meson #Mixing (physics) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Polarization (electrochemistry) #Pseudoscalar #Pseudoscalar meson #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1088/1674-1137/42/6/063101
published in Chinese Physics C 42(6), 063101 (IOP Publishing) · 13 pages
openalex created_date 2017/06/05 · openalex publication_date 2018/05/01 · arxiv created 2018/05/09 · arxiv updated 2018/05/10 · openalex updated_date 2026/08/06
We calculate the D 0 − D ― 0 mixing parameter y in the factorization-assisted topological-amplitude (FAT) approach, considering contributions from D 0 → PP , PV, and VV modes, where P (V) stands for a pseudoscalar (vector) meson. The D 0 → PP and PV decay amplitudes are extracted in the FAT approach, and the D 0 → VV decay amplitudes with final states in the longitudinal polarization are estimated via the parameter set for D 0 → PV . It is found that the VV contribution to y , being of order of 10 −4 , is negligible, and that the PP and PV contributions amount only up to y P P + P V = ( 0.21 ± 0.07 ) % , a prediction more precise than those previously obtained in the literature, and much lower than the experimental data y exp = ( 0.61 ± 0.08 ) % . We conclude that D 0 meson decays into other two-body and multi-particle final states are relevant to the evaluation of y , so it is difficult to understand it fully in an exclusive approach.