Ablikim, M.Achasov, M. N.Adlarson, P.Albrecht, M.Aliberti, R.Amoroso, A.Çetin, Serkant Ali2024-05-192024-05-1920222470-00102470-0029https://doi.org10.1103/PhysRevD.106.092004https://hdl.handle.net/20.500.12713/5786A measurement of the CP-even fraction of the decay D-0 -> pi(+) pi(-) pi(+) pi(-) is performed with a quantum-correlated psi(3770) -> D (D) over bar data sample collected by the BESIII experiment, corresponding to an integrated luminosity of 2.93 fb(-1). Using a combination of CP eigenstates, D-0 -> pi(+) pi(-) pi(+) pi(-) and D -> K-S,L(0) pi(+) pi(-) as tagging modes, the CP-even fraction is measured to be F-+(4 pi) = 0.735 +/- 0.015 +/- 0.005, where the first uncertainty is statistical and the second is systematic. This is the most precise determination of this quantity to date. It provides valuable model-independent input for the measurement of the angle gamma of the Cabibbo-Kobayashi-Maskawa matrix with B +/- -> DK +/- decays, and for time-dependent studies of CP violation and mixing in the D-0-(D) over bar (0) system.eninfo:eu-repo/semantics/openAccessDifferencePhaseArticle1069WOS:0009854275000012-s2.0-85143214106Q110.1103/PhysRevD.106.092004Q1