Dispersive calculation of complex Regge trajectories for the lightest f(2) resonances and the K*(892)

作者：Carrasco J A^*; Nebreda J; Pelaez J R; Szczepaniak A P

来源：Physics Letters B, 2015, 749: 399-406.

DOI：10.1016/j.physletb.2015.08.019

We apply a recently developed dispersive formalism to calculate the Regge trajectories of the f(2)(1270), f(2)'(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.

• 出版日期2015-10-7