An intrinsic peak-dip-hump and strong coupling effects in   $Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}$ ARPES data near $(\pi,0)$
  A well-known peak-dip-hump structure exists near $(\pi, 0)$ in superconducting state ARPES spectra of $Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}$ (Bi2212). Here we report results on optimal and overdoped Bi2212 samples indicating the traditional peak-dip-hump structure observed near $(\pi,0)$ is largely due to bilayer splitting. However a separate, much weaker peak-dip hump (PDH) structure distinct from bilayer splitting can be detected near $(\pi, 0)$. This new PDH structure is consistent with electronic coupling to the magnetic resonance mode in Bi2212. Both the dispersion and line shape signatures indicate strong coupling to this mode. 
A. D. Gromko, Y.-D. Chuang, A. V. Fedorov, Y. Aiura, Y. Yamaguchi, K.   Oka, Yoichi Ando, D. S. Dessau