High Energy features in the photoenission spectra of cuprates

We calculate the real part of the self-energy of fermions scattering off the quantum critical fluctuations derived for cuprates. At the upper cut-off of the quantum critical fluctuation spectra a logarithmic divergence in the real part of the self-energy occurs. The position of the peak of the one-particle spectral function is pinned near this divergence. This explains the recent high energy features observed in angle-resolved photoemission in cuprates superconductors.