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Using femtosecond time- and angle-resolved photoemission spectroscopy weinvestigate the effect of electron doping on the electron dynamics inBa(Fe_{1-x}Co_x)_2As_2 in a range of 0 < x < 0.15 at temperatures slightlyabove the N\'eel temperature. By analyzing the time-dependent photoemissionintensity of the pump laser excited population as a function of energy, wefound that the relaxation times at 0 < E-E_F < 0.2 eV are doping dependent andabout 100 fs shorter at optimal doping than for overdoped and parent compounds.Analysis of the relaxation rates also reveals the presence of a pump fluencedependent step in the relaxation time at E-E_F = 200meV which we explain bycoupling of the excited electronic system to a boson of this energy. We compareour results with static ARPES and transport measurements and find disagreementand agreement concerning the doping-dependence, respectively. We discuss theeffect of the electron-boson coupling on the energy-dependent relaxation andassign the origin of the boson to a magnetic excitation.

Doping dependence and electron-boson coupling in the ultrafast relaxation of hot electron populations in Ba(Fe_{1-x}Co_x)_2As_2