2026-04-17T10:16:07Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2206182025-11-21T05:25:48Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

Amplitude analysis of the D + → π − π + π + decay and measurement of the π − π + S-wave amplitude Aaij, R. Alfonso Albero, Alejandro Garcia Moreno, Paula Garrido Beltrán, Lluís Gironella Gironell, Pere Gomez Fernandez, S. Graugés Pous, Eugeni Lobo Salvia, Aniol Marin Benito, Carla Mauricio, J. Vazquez Gomez, R. LHCb Collaboration Física de partícules Hadrons Particle physics Hadrons An amplitude analysis of the D+ → π −π +π + decay is performed with a sample corresponding to 1.5 fb−1 of integrated luminosity of pp collisions at a centre-of-mass energy √ s = 8 TeV collected by the LHCb detector in 2012. The sample contains approximately six hundred thousand candidates with a signal purity of 95%. The resonant structure is studied through a fit to the Dalitz plot where the π −π + S-wave amplitude is extracted as a function of π −π + mass, and spin-1 and spin-2 resonances are included coherently through an isobar model. The S-wave component is found to be dominant, followed by the ρ(770)0π + and f2(1270)π + components. A small contribution from the ω(782) → π −π + decay is seen for the first time in the D+ → π −π +π + decay. 2025-04-25T12:11:01Z 2025-04-25T12:11:01Z 2023 2025-04-25T12:11:01Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1126-6708 https://hdl.handle.net/2445/220618 757732 eng Reproducció del document publicat a: https://doi.org/10.1007/JHEP06(2023)044 Journal of High Energy Physics, 2023, vol. 2023, num.44, p. 1-28 https://doi.org/10.1007/JHEP06(2023)044 cc-by (c) Aaij, R. et al., 2023 http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess 28 p. application/pdf application/pdf Springer Verlag Articles publicats en revistes (Física Quàntica i Astrofísica)