Dispersive calculation of complex Regge trajectories for the lightest f2 resonances and the K⁎(892)
- Carrasco, J.A.
- Nebreda, J.
- Pelaez, J.R.
- Szczepaniak, A.P.
Publication date
October 2015
DOI Publisher
The Authors. Published by Elsevier B.V.Abstract
AbstractWe apply a recently developed dispersive formalism to calculate the Regge trajectories of the f2(1270), f2′(1525) and K⁎(892) mesons. Trajectories are calculated, not fitted to a family of resonances. Assuming that these resonances can be treated in the elastic approximation, the only input are the pole position and residue of a resonance. In all three cases, the predicted Regge trajectories are almost real and linear, with slopes in agreement with the universal value of order 1 GeV−2. We also show how these results barely change when considering more than two subtractions in the dispersive formalism
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