  We study the momentum-integrated quasiparticle interference (QPI) in the
FeSe-based superconductors. This method was recently proposed theoretically and
has been applied to determine the pairing symmetry in these materials
experimentally. Our findings suggest that, if the incipient bands and the
superconducting (SC) pairing on them are taken into consideration, then the
experimentally measured bound states and momentum-integrated QPI can be well
fitted, even if the SC order parameter does not change sign on the Fermi
surfaces. Therefore, we offer an alternative explanation to the experimental
data, calling for more careful identification of the pairing symmetry that is
important for the pairing mechanism.
