The non-ordinary Regge behavior of the $f_0(500)$ meson
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 $\rho(770)$ 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.
- Publication:
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arXiv e-prints
- Pub Date:
- April 2014
- DOI:
- 10.48550/arXiv.1404.6058
- arXiv:
- arXiv:1404.6058
- Bibcode:
- 2014arXiv1404.6058P
- Keywords:
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- High Energy Physics - Phenomenology;
- Nuclear Theory
- E-Print:
- 6 pages. To appear in the proceedings of the "Excited QCD 2014", Bjelasnica Mountain, Sarajevo, Bosnia-Herzegovina, 2-8 February,2014