Amplitude analyses of D 0 → π + π − π + π − and D 0 → K + K − π + π − decays
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Abstract
The resonant substructure of D 0 + - + -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) + -, D 0 f 0 (1370) and D 0 (770) 0 (770) 0 . The broad resonances a 1 (1260) + , (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 a 1 (1260) + = [1225 9 (stat) 17 (syst) 10 (model)] MeV/c 2 and a 1 (1260) + = [430 24 (stat) 25 (syst) 18 (model)] MeV. The amplitude model of D 0 K + K - + -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 (1020)(770) 0 , D 0 K 1 (1270) + K -and D 0 K(1400) + K -.
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