what are regge trajectories???
It's a shame that it's hard to find introductions to Regge trajectories on the net. You might try a post on the subject (comparing them to Koide's mass formula) on my blog because I think there's a reasonable explanation, and some links to other sources of information on them:
In short, Regge trajectories are not "trajectories" as most know the word, but instead are relations among the masses of certain particles.
Regge "trajectories" suggest a relation between the angular momentum and
mass of meson and baryon resonances. It's indeed hard to find some decent
information on the internet but this paper has quite a few graphs.
Here's a very nice new paper:
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