  We probe flavour branes in the Klebanov-Witten background in global
coordinates. We show that supersymmetric probes correspond to massless flavours
and analyse their spectrum of fluctuations. Our studies suggest that the mesons
are dissociated by the Casimir energy. The spectrum is equidistant, with a
ground state given by the conformal dimension of the operator dual to the
fluctuations. We show that the equidistant structure of the spectrum arises
from the addition of the angular momenta of the fundamental fields composing
the meson operators.
