التفاصيل البيبلوغرافية
| العنوان: |
Amplitude analyses of D → π π π π and D → K K π π decays. |
| المؤلفون: |
d'Argent, P., Skidmore, N., Benton, J., Dalseno, J., Gersabeck, E., Harnew, S., Naik, P., Prouve, C., Rademacker, J. |
| المصدر: |
Journal of High Energy Physics; May2017, Vol. 2017 Issue 5, p1-57, 57p |
| مصطلحات موضوعية: |
RADIOACTIVE decay, RESONANT vibration, INTERMEDIATE state (Superconductors), ASYMMETRY (Chemistry), CHARM particles |
| مستخلص: |
The resonant substructure of D → ππππ 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 → a (1260) π, D → σ f (1370) and D → ρ(770) ρ(770). The broad resonances a (1260), π(1300) and a (1640) are studied in detail, including quasi-modelindependent parametrizations of their lineshapes. The mass and width of the a (1260) meson are determined to be m (1260) = [1225 ± 9 (stat) ± 17 (syst) ± 10 (model)] MeV /c and Γ(1260) = [430 ± 24 (stat) ± 25 (syst) ± 18 (model)] MeV. The amplitude model of D → K K ππ 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 → ϕ(1020) ρ(770), D → K (1270) K and D → K(1400) K . The fractional CP -even content of the decay D → ππππ 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 D → K K ππ decays, the CP -even fraction is measured for the first time and found to be F = [75.3 ± 1.8 (stat) ± 3.3 (syst) ± 3.5 (model)] %. The global decay rate asymmetries between D and $$ {\overline{D}}^0 $$ decays are measured to be $$ {\mathcal{A}}_{CP}^{4\uppi}=\left[+0.54\pm 1.04\ \left(\mathrm{stat}\right)\pm 0.51\ \left(\mathrm{syst}\right)\right]\% $$ and $$ {\mathcal{A}}_{CP}^{KK\pi \pi}=\left[+1.84\pm 1.74\ \left(\mathrm{stat}\right)\pm 0.30\ \left(\mathrm{syst}\right)\right]\% $$ . A search for CP asymmetries in the amplitude components yields no evidence for CP violation in either decay mode. [ABSTRACT FROM AUTHOR] |
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