  Near the antiferromagnetic quantum critical point (QCP) of electron-doped
cuprate superconductors, angle-resolved photoemission experiments detect hot
spots where the Fermi surface disappears. Here we demonstrate, using the
two-particle self-consistent theory, that in the antinodal region the Fermi
liquid remains stable for a broad range of angles on the Fermi surface and for
all dopings near the QCP. We show how the quasiparticle weight Z and effective
mass m* change and then abruptly become meaningless as the hot spots are
approached. We propose a dimensionless number, easily accessible in ARPES
experiments, that can be used to gauge the strength of correlations.
