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arXiv · 1404.6058

The non-ordinary Regge behavior of the $f_0(500)$ meson

J. R. Peláez·J. T. Londergan·J. Nebreda·A. P. Szczepaniak
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Abstract

We review how the Regge trajectory of an elastic resonance can be obtained just from its pole position and coupling, by means of a dispersive formalism. This allows to deal correctly with the finite widths of resonances in Regge trajectories. For the $ρ(770)$ meson this method leads to the ordinary linear Regge trajectory with a universal slope. In contrast, for the $f_0(500)$ meson, the resulting Regge trajectory is non-linear and with much smaller slope. This is another strong indication of the non-ordinary nature of the lightest scalar meson.

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J. R. Peláez, J. T. Londergan, J. Nebreda, A. P. Szczepaniak. 2014-04-24. The non-ordinary Regge behavior of the $f_0(500)$ meson. https://arxiv.org/abs/1404.6058

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