Alfonso Albero, AlejandroGarcia Moreno, PaulaGarrido Beltrán, LluísGironella Gironell, PereGomez Fernandez, S.Graugés Pous, EugeniLobo Salvia, AniolLópez Huertas, AlbertMarin Benito, CarlaMauricio, J.Vazquez Gomez, RicardoLHCb collaboration2025-04-252025-04-2520231126-6708https://hdl.handle.net/2445/220628A Dalitz plot analysis of the D+ s → π −π +π + decay is presented. The analysis is based on proton-proton collision data recorded by the LHCb experiment at a centreof-mass energy of 8 TeV and corresponding to an integrated luminosity of 1.5 fb−1 . The resonant structure of the decay is obtained using a quasi-model-independent partial-wave analysis, in which the π +π − S-wave amplitude is parameterised as a generic complex function determined by a fit to the data. The S-wave component is found to be dominant, followed by the contribution from spin-2 resonances and a small contribution from spin-1 resonances. The latter includes the first observation of the D+ s → ω(782)π + channel in the D+ s → π −π +π + decay. The resonant structures of the D+ s → π −π +π + and D+ → π −π +π + decays are compared, providing information about the mechanisms for the hadron formation in these decays.35 p.application/pdfengcc-by (c) LHCb collaboration, 2023http://creativecommons.org/licenses/by/4.0/Física de partículesHadronsParticle physicsHadronsinfo:eu-repo/semantics/article7577192025-04-25info:eu-repo/semantics/openAccess