Phase Motion in the Scalar Low-Mass $π^-π^+$ Amplitude in $D^+ \to π^-π^+π^+$

Details Phase Motion in the Scalar Low-Mass $π^-π^+$ Amplitude in $D^+ \to π^-π^+π^+$ Phase Motion in the Scalar Low-Mass $π^-π^+$ Amplitude in $D^+ \to π^-π^+π^+$

2003-09-25

arxiv.org/abs/hep-ex/0309071v1

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 2 figures, talk given at X International Conference on Hadron Spectroscopy (HADRON '03), Aschaffenburg, Germany

Scientific paper

10.1063/1.1799723

This work is a direct and model-independent measurement of the low mass $\pi^+\pi^-$ phase motion in the $D^+ \to \pi^-\pi^+\pi^+$ decay. The results show a strong phase variation, compatible with an isoscalar $\sigma(500)$ meson. This result confirms the previous Fermilab E791 result which found evidence for the existence of this scalar particle using a full Dalitz-plot analysis.

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