  The correlations between a $B$ meson and a pion produced nearby in phase
space should respect isospin reflection symmetry $I_3 \to -I_3$. Thus, one
generally expects similar $\pi^+ B^0$ and $\pi^- B^+$ correlations (non-exotic
channels), and similar $\pi^- B^0$ and $\pi^+ B^+$ correlations (exotic
channels). Exceptions include (a) fragmentation processes involving exchange of
quarks with the producing system, (b) misidentification of charged kaons as
charged pions, and (c) effects of decay products of the associated
$\overline{B}$. All of these can affect the apparent signal for correlations of
charged $B$ mesons with charged hadrons. The identification of the flavor of
neutral $B$ mesons through the decay $B^0 \to K^{*0} J/\psi$ requires good
particle identification in order that the decay $K^{*0} \to K^+ \pi^-$ not be
mistaken for $\overline{K}^{*0} \to K^- \pi^+$, in which case the correlations
of neutral $B$ mesons with hadrons can be underestimated.
