2021/03/31 by BESIII Collaboration, M. Ablikim, M. N. Achasov +505
Physics and Astronomy · #Charm (quantum number) #Coherence (philosophical gambling strategy) #Luminosity #Meson #Observable #Particle physics theoretical and experimental studies #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions #Superposition principle #Unitarity #hep-ex
paper · pdf · doi:10.1007/jhep05(2021)164
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openalex created_date 2021/03/15 · openalex publication_date 2021/05/01 · arxiv created 2022/02/27 · arxiv updated 2022/03/01 · openalex updated_date 2026/08/06
The decays D→ K-π+π+π- and D → K-π+π0 are studied in a sample of quantum-correlated DD pairs produced through the process e+e- → ψ(3770) → DD, exploiting a data set collected by the BESIII experiment that corresponds to an integrated luminosity of 2.93 fb-1. Here D indicates a quantum superposition of a D0 and a D0 meson. By reconstructing one neutral charm meson in a signal decay, and the other in the same or a different final state, observables are measured that contain information on the coherence factors and average strong-phase differences of each of the signal modes. These parameters are critical inputs in the measurement of the angle γ of the Unitarity Triangle in B- → DK- decays at the LHCb and Belle II experiments. The coherence factors are determined to be RK3π=0.52+0.12-0.10 and RKππ0=0.78 ± 0.04, with values for the average strong-phase differences that are δDK3π=(167+31-19)^∘ and δDKππ0=(196+14-15)^∘, where the uncertainties include both statistical and systematic contributions. The analysis is re-performed in four bins of the phase-space of the D → K-π+π+π- to yield results that will allow for a more sensitive measurement of γ with this mode, to which the BESIII inputs will contribute an uncertainty of around 6^∘.