  Lattice techniques are the most reliable ones to investigate non-perturbative
aspects of quantum chromodynamics (QCD) such as its phase diagram in the
temperature-baryon density plane. They are, however, well-known to be beset
with a variety of problems as one increases the density. We address here the
old question of placing the baryonic (quark) chemical potential on the lattice.
We point out that it may have important consequences for the current and future
experimental searches of QCD critical point.
