  Is there a theory or good experimental evidence?
  Bj's question: Pentaquark is created by $e^+e^-$. $2q + q \to$ Baryon $; ~ ~
~ 2q + \bar q \to $ Triquark$ ; ~ ~ ~ 2q + $Triquark $ \to $Pentaquark Does it
live long onough to be observable? Basic physics of constituent quarks and
flavor antisymmetry. Report of $\Theta^+$ violating flavor antisymmetry
indicates need for two-cluster model.. Ball in Experimental Court - Some
experiments see $\Theta^+$; others don't. Possible production mechanisms
present in some experiments, absent in others; e.g. via $N^*(2.3 \rm{GeV}) \to
\Theta^+ + \bar K$?

High Energy Physics - Phenomenology