Abstract
The Heavy Diquark Symmetry (HDS) of Doubly Heavy Baryons (DHBs) provides new
insights into the spectroscopy of these hadrons. We derive the consequences of
this symmetry for the mass spectra and the decay widths of DHBs. We compare
these symmetry constraints to results from a nonrelativistic quark model for
the mass spectra and results from the \$^3P\_0\$ model for strong decays. The
quark model we implement was not constructed with these symmetries and contains
interactions which explicitly break HDS. Nevertheless, these symmetries emerge.
We argue that the \$^3P\_0\$ model and any other model for strong transitions
which employs a spectator assumption explicitly respects HDS. We also explore
the possibility of treating the strange quark as a heavy quark and apply these
ideas to \$\Xi\$, \$\Xi\_c\$, and \$\Xi\_b\$ baryons.
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