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)0 π+ and f 2(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.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Amplitude analysis of the D + → π − π + π + decay and measurement of the π − π + S-wave amplitude. JOURNAL OF HIGH ENERGY PHYSICS, 2023(6) [10.1007/JHEP06(2023)044].

Amplitude analysis of the D + → π − π + π + decay and measurement of the π − π + S-wave amplitude

Borsato M.;Calvi M.;Capelli S.;Carniti P.;Fazzini D.;Garcia Pardinas J.;Gotti C.;Kirsebom V. S.;Martinazzoli L.;Martinelli M.;Meloni S.;Minotti A.;Petruzzo M.;Pizzichemi M.;Salomoni M.;Shields E. B.;
2023

Abstract

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)0 π+ and f 2(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.
Articolo in rivista - Articolo scientifico
Charm Physics; Hadron-Hadron Scattering; Particle and Resonance Production;
English
9-giu-2023
2023
2023
6
44
open
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Amplitude analysis of the D + → π − π + π + decay and measurement of the π − π + S-wave amplitude. JOURNAL OF HIGH ENERGY PHYSICS, 2023(6) [10.1007/JHEP06(2023)044].
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