Resumen

BEDIAGA, Ignacio. Scalar meson s phase motion at D⁺® p^- p⁺p⁺ decay. Braz. J. Phys. [online]. 2004, vol.34, n.4a, pp. 1398-1405. ISSN 0103-9733.  http://dx.doi.org/10.1590/S0103-97332004000700017.

We make a direct and model-independent measurement of the low p⁺ p^- mass phase motion in the D⁺ ® p^-p⁺p⁺ decay. Our preliminary results show a strong phase variation, compatible with the isoscalar s(500) meson. This result confirms our previous result [1] where we found evidence for the existence of this scalar particle using full Dalitz-plot analysis. We apply the Amplitude Difference (AD) method [2] to the same Fermilab E791 data sample used in the preceding analysis. We also give an example of how we extract the phase motion of the scalar amplitude, looking at the f₀(980) in D_s⁺ ® p^-p⁺p⁺ decay.