Searches for CP Violation and ππS-Wave in the Dalitz-Plot Analysis of D0 --> π+π-\pi0

Details Searches for CP Violation and ππS-Wave in the Dalitz-Plot Analysis of D0 --> π+π-\pi0 Searches for CP Violation and ππS-Wave in the Dalitz-Plot Analysis of D0 --> π+π-\pi0

2005-03-30

arxiv.org/abs/hep-ex/0503052v2

Phys.Rev.D72:031102,2005; Erratum-ibid.D75:119904,2007

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2005/, submitted to PRL

Scientific paper

10.1103/PhysRevD.72.031102

In e+e- collisions recorded using the CLEO II.V detector we have studied the Cabibbo suppressed decay of D0 -> pi+pi-pi0 with the initial flavor of the D0 tagged by the decay D*+ -> D0pi+. We use the Dalitz-plot analysis technique to measure the resonant substructure in this final state and observe \rho\pi and non-resonant contributions by fitting for their amplitudes and relative phases. We describe the pipi S-wave with a K-matrix formalism and limit this contribution to the rate to be < 2.5% @95% confidence level, in contrast to the large rate observed in D+ -> pi+pi-pi+ decay. Using the amplitudes and phases from this analysis, we calculate an integrated CP asymmetry of 0.01^{+0.09}_{-0.07} +/- 0.05.

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