Amplitude analyses of D0→π+π-π+π- and D0→K+K-π+π- decays
The resonant substructure of D 0 → π+π−π+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 pro...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
May 29, 2017
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| In: |
Journal of high energy physics
Year: 2017, Issue: 5 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP05(2017)143 |
| Online Access: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1007/JHEP05(2017)143 Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/JHEP05(2017)143 
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| Author Notes: | P. d’Argent, N. Skidmore, J. Benton, J. Dalseno, E. Gersabeck, S.T. Harnew, P. Naik, C. Prouve and J. Rademacker |
| Summary: | The resonant substructure of D 0 → π+π−π+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 D 0 → a 1(1260)+ π−, D 0 → σ f 0(1370) and D 0 → ρ(770)0 ρ(770)0. The broad resonances a 1(1260)+, π(1300)+ and a 1(1640)+ are studied in detail, including quasi-modelindependent parametrizations of their lineshapes. The mass and width of the a 1(1260)+ meson are determined to be m a1(1260)+ = [1225 ± 9 (stat) ± 17 (syst) ± 10 (model)] MeV/c 2 and Γa1(1260)+ = [430 ± 24 (stat) ± 25 (syst) ± 18 (model)] MeV. The amplitude model of D 0 → K + K −π+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 D 0 → ϕ(1020)ρ(770)0, D 0 → K 1(1270)+ K − and D 0 → K(1400)+ K −.The fractional CP -even content of the decay D 0 → π+π−π+π− is calculated from the amplitude model to be F + 4π = [72.9 ± 0.9(stat) ± 1.5(syst) ± 1.0(model)] %, consistent with that obtained from a previous model-independent measurement. For D 0 → K + K −π+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 D 0 and D¯¯¯¯0D¯0 {\overline{D}}^0 decays are measured to be A4πCP=[+0.54±1.04 (stat)±0.51 (syst)]%ACP4π=[+0.54±1.04 (stat)±0.51 (syst)]% {\mathcal{A}}_{CP}^{4\uppi}=\left[+0.54\pm 1.04\ \left(\mathrm{stat}\right)\pm 0.51\ \left(\mathrm{syst}\right)\right]\% and AKKππCP=[+1.84±1.74 (stat)±0.30 (syst)]%ACPKKππ=[+1.84±1.74 (stat)±0.30 (syst)]% {\mathcal{A}}_{CP}^{KK\pi \pi}=\left[+1.84\pm 1.74\ \left(\mathrm{stat}\right)\pm 0.30\ \left(\mathrm{syst}\right)\right]\% . A search for CP asymmetries in the amplitude components yields no evidence for CP violation in either decay mode. |
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| Item Description: | Im Titel wird "pi" als griechischer Buchstabe dargestellt Im Titel sind die Zeichen "+" und "-" sowie die Zahl "0" hochgestellt Gesehen am 15.08.2018 |
| Physical Description: | Online Resource |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP05(2017)143 |