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Despite many ARPES investigations of iron pnictides, the structure of theelectron pockets is still poorly understood. By combining ARPES measurements indifferent experimental configurations, we clearly resolve their elliptic shape.Comparison with band calculation identify a deep electron band with the dxyorbital and a shallow electron band along the perpendicular ellipse axis withthe dxz/dyz orbitals. We find that, for both electron and hole bands, thelifetimes associated with dxy are longer than for dxz/dyz. This suggests thatthe two types of orbitals play different roles in the electronic properties andthat their relative weight is a key parameter to determine the ground state.

Orbitally resolved lifetimes in Ba(Fe0.92Co0.08)2As2 measured by ARPES