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We performed angle resolved photoelectron spectroscopy (ARPES) studies onmechanically detwinned BaFe2As2. We observe clear band dispersions and theshapes and characters of the Fermi surfaces are identified. Shapes of the twohole pockets around the {\Gamma}-point are found to be consistent with theFermi surface topology predicted in the orbital ordered states. Dirac-cone likeband dispersions near the {\Gamma}-point are clearly identified astheoretically predicted. At the X-point, split bands remain intact in spite ofdetwinning, barring twinning origin of the bands. The observed band dispersionsare compared with calculated band structures. With a magnetic moment of 0.2 ?Bper iron atom, there is a good agreement between the calculation andexperiment.

Electronic Structure Studies of Detwinned BaFe$_2$As$_2$ by Photoemission