Experimental Evidence for a Light and Broad Scalar Resonance in $D^{+} \to π^{-} π^{+} π^{+}$ Decay

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29 January 2001

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 86 (5) , 770-774
https://doi.org/10.1103/physrevlett.86.770

Abstract

From a sample of

1172 \pm 61

D^{+} \to π^{-} π^{+} π^{+}

decays, we find

Γ (D^{+} \to π^{-} π^{+} π^{+}) / Γ (D^{+} \to K^{-} π^{+} π^{+}) = 0.0311 \pm {0.0018}_{- 0.0026}^{+ 0.0016}

. Using a coherent amplitude analysis to fit the Dalitz plot of these decays, we find strong evidence that a scalar resonance of mass

478_{- 23}^{+ 24} \pm 17 MeV / c^{2}

and width

324_{- 40}^{+ 42} \pm 21 MeV / c^{2}

accounts for approximately half of all decays.

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