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Title: Regge trajectory of the f0(500) resonance from a dispersive connection to its pole

We report here our results on how to obtain the Regge trajectory of a resonance from its pole in a scattering process by imposing analytic constraints in the complex angular momentum plane. The method, suited for resonances that dominate an elastic scattering amplitude, has been applied to the ρ (770) and the f0(500) resonances. Whereas for the former we obtain a linear Regge trajectory, characteristic of ordinary quark-antiquark states, for the latter we find a non-linear trajectory with a much smaller slope at the resonance mass. This provides a strong indication of the non-ordinary nature of the sigma meson.
 [1] ;  [2] ;  [3] ;  [2]
  1. Kyoto University, Kyoto, 606-8502, Japan
  2. Indiana University , Bloomington, IN
  3. Universidad Complutense de Madrid, 28040, Spain
Publication Date:
OSTI Identifier:
Report Number(s):
JLAB-THY-13-1796; DOE/OR/23177-3310; arXiv:1403.2790
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Seventh International Symposium of Chiral Symmetry in Hadrons and Nuclei, Beijing, China, 27 – 30 October 2013
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States