Scalar mesons from Unitarized Chiral Perturbation Theory: N_c and quark mass dependences

Details Scalar mesons from Unitarized Chiral Perturbation Theory: N_c and quark mass dependences Scalar mesons from Unitarized Chiral Perturbation Theory: N_c and quark mass dependences

2007-11-27

arxiv.org/abs/0711.4223v1

ECONFC070910:157,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Invited talk to the 11th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, Sept. 10th-14th 2

Scientific paper

We review recent studies of light scalar meson properties by means of unitarization techniques, obtained from dispersion theory, and applied to the Chiral Perturbation Theory expansion. In particular, light scalars do not follow the N_c dependence of $\bar q q$ states although a subdominant quark-antiquark component may be observed to arise for the f_0(600) around 1 GeV, where another quark-antiquark multiplet is believed to exist. Finally, we present our preliminary results on the quark mass dependence of the f_0(600) and rho(770) resonances.

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