Abstract
The relativistic model describing orbital excitations of hadrons composed of light quarks is considered. All the hadrons are treated in a uniform way as the states of a straight-line string with spinors at its ends. There are a quark and antiquark at the ends in the case of mesons, and a quark and diquark for baryons. The model has an additional symmetry, which allows one to describe the exact LS degeneracy. Although the model proposed is essentially relativistic, the states of its spectrum are classified as in nonrelativistic potential models. The spectrum consists of the family of trajectories arising from splitting the leading Regge trajectory due to the spin of quarks.
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