Abstract
We compute the meson spectrum of an 
= 2 super
Yang-Mills theory with fundamental matter from its dual string theory
on AdS5 × S5 with a D7-brane probe [1]. For scalar
and vector mesons with arbitrary R-charge the spectrum is computed in
closed form by solving the equations for D7-brane fluctuations; for
matter with non-zero mass mq it is discrete, exhibits a mass gap of
order mq/(gsN)1/2 and furnishes representations of SO(5) even though the manifest global symmetry of the theory is only
SO(4). The spectrum of mesons with large spin J is obtained
from semiclassical, rotating open strings attached to the D7-brane. It
displays Regge-like behaviour for J << (gsN)1/2, whereas for
J >> (gsN)1/2 it corresponds to that of two non-relativistic
quarks bound by a Coulomb potential. Meson interactions, baryons and
`giant gauge bosons' are briefly discussed.
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