Ablikim, M.Achasov, M. N.Adlarson, P.Albrecht, M.Aliberti, R.Amoroso, A.Çetin, Serkant Ali2024-05-192024-05-1920232470-00102470-0029https://doi.org10.1103/PhysRevD.107.032009https://hdl.handle.net/20.500.12713/5797A determination of the CP-even fraction F thorn in the decay D-0 -> K+K- pi(+) pi- is presented. Using 2.93 fb(-1) of e(+) e(-) -> psi(3770) -> D (D) over bar data collected by the BESIII detector, one charm meson is reconstructed in the signal mode and the other in a CP eigenstate or the decay D -> K-S,L(0) pi(+) pi(-). Analysis of the relative rates of these double-tagged events yields the result F+= 0.730 +/- 0.037 +/- 0.021, where the first uncertainty is statistical and the second is systematic. This is the first model-independent measurement of F thorn in D-0 -> K+ K-pi(+) pi(-) decays.eninfo:eu-repo/semantics/openAccess[No Keywords]Article1073WOS:0009893276000012-s2.0-85149972946N/A10.1103/PhysRevD.107.032009Q1