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We revisit the issue of the gap symmetry in KFe2As2, which is an Fe-pnictidesuperconductor with only hole pockets. Previous theoretical studies mostlyargued for a d-wave gap in KFe2As2 since transport and thermodynamicmeasurements point to the presence of the gap nodes. However, a d-wave gap isinconsistent with recent laser-based angle-resolved photoemission measurements.We propose the scenario for a nodal s-wave superconductivity induced by anon-magnetic intra-band and inter-band interactions between fermions near holepockets. The superconducting gap changes sign between the hole pockets and hascos 4\theta angular dependence and accidental nodes on one or several holepockets. We argue that strong angle dependence is the consequence ofnear-degeneracy between inter-pocket and intra-pocket interaction on the holepockets. We also analyze cos 4\theta angular dependence of the gap in otherFe-pnictides and compare theoretical results with the photoemission experimentsof LiFeAs.

Gap Symmetry in KFe_2As_2 and cos 4\theta gap component in LiFeAs