  We analyze evolution of the single particle excitation spectrum of the
underdoped cuprate superconductors near the anti-nodal region, considering
temperatures below and and above the phase transition. We inspect the
phenomenological self-energy that reproduces the
angle-resolved-photoemission-spectroscopy (ARPES) data and we show that above
the critical temperature, such procedure implies a transfer of the spectral
weight from the Bogoliubov-type quasiparticles towards the in-gap damped
states. We also discuss some possible microscopic arguments explaining this
process.
