Experimental evidence for a light and broad scalar resonance in $D^+\to π^-π^+π^+$ decay

Details Experimental evidence for a light and broad scalar resonance in $D^+\to π^-π^+π^+$ decay Experimental evidence for a light and broad scalar resonance in $D^+\to π^-π^+π^+$ decay

2000-07-14

arxiv.org/abs/hep-ex/0007028v2

Phys.Rev.Lett.86:770-774,2001

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 3 eps figures

Scientific paper

10.1103/PhysRevLett.86.770

From a sample of $1172 \pm 61$ $D^+ \to \pi^- \pi^+ \pi^+$ decay, we find $\Gamma (D^+ \to \pi^- \pi^+ \pi^+) / \Gamma (D^+ \to K^- \pi^+ \pi^+) = 0.0311 \pm 0.0018 ^{+0.0016}_{-0.0026}$. Using a coherent amplitude analysis to fit the Dalitz plot of this decays, we find strong evidence that a scalar resonance of mass $478^{+24}_{-23} \pm 17$ MeV/$c^2$ and width $324^{+42}_{-40} \pm 21$ MeV/$c^2$ accounts for approximately half of all decays.

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