Amplitude analyses of D 0 → π + π π + π and D 0 → K + K π + π decays

P. d’Argent*, N. Skidmore, J. Benton, J. Dalseno, E. Gersabeck, S. T. Harnew, P. Naik, C. Prouve, J. Rademacker

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

The resonant substructure of D0 → π+ππ+π decays is studied using data collected by the CLEO-c detector. An amplitude analysis is performed in order to disentangle the various intermediate state contributions. To limit the model complexity a data driven regularization procedure is applied. The prominent contributions are the decay modes D0 → a1(1260)+ π, D0 → σ f0(1370) and D0 → ρ(770)0ρ(770)0. The broad resonances a1(1260)+, π(1300)+ and a1(1640)+ are studied in detail, including quasi-modelindependent parametrizations of their lineshapes. The mass and width of the a1(1260)+ meson are determined to be ma1(1260)+ = [1225 ± 9 (stat) ± 17 (syst) ± 10 (model)] MeV/c2 and Γa1(1260)+ = [430 ± 24 (stat) ± 25 (syst) ± 18 (model)] MeV. The amplitude model of D0 → K+Kπ+π decays obtained from CLEO II.V, CLEO III, and CLEO-c data is revisited with improved lineshape parametrizations. The largest components are the decay modes D0 → ϕ(1020)ρ(770)0, D0 → K1(1270)+K and D0 → K(1400)+K. The fractional CP -even content of the decay D0 → π+ππ+π is calculated from the amplitude model to be F+ = [72.9 ± 0.9(stat) ± 1.5(syst) ± 1.0(model)] %, consistent with that obtained from a previous model-independent measurement. For D0 → K+Kπ+π decays, the CP -even fraction is measured for the first time and found to be F+ KKππ = [75.3 ± 1.8 (stat) ± 3.3 (syst) ± 3.5 (model)] %. The global decay rate asymmetries between D0 and D¯ 0 decays are measured to be ACP4π=[+0.54±1.04(stat)±0.51(syst)]% and ACPKKππ=[+1.84±1.74(stat)±0.30(syst)]%. A search for CP asymmetries in the amplitude components yields no evidence for CP violation in either decay mode.

Original languageEnglish
Pages (from-to)1-57
JournalJournal of High Energy Physics
Volume2017
Issue number5
DOIs
Publication statusPublished - 29 May 2017

Keywords

  • Charm physics
  • CP violation
  • e+-e- Experiments
  • Flavor physics
  • Spectroscopy

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