Erratum: Energetic γ-rays from TeV scale dark matter annihilation resummed (Physics Letters B (2018) 786 (347–354), (S0370269318307652), (10.1016/j.physletb.2018.10.008))

In the course of working on the extension [1] of Refs. [2,3] to Higgsino dark matter annihilation, we became aware of a missing factor of two in Eq. (5) of Ref. [2]. The correct equation reads [Formula presented] The factor of 2 is necessary in the method-2 computation of the Sommerfeld effect [4] for the annihilation of two identical particles to compensate for the method-2 factor [Formula presented], which appears in [Formula presented] defined in Eq. (6) of Ref. [2]. In consequence the absolute cross section shown in the upper panel of Fig. 4 should also be multiplied by two. The correct Figure is shown below. We also correct a few misprints: • In Eq. (27) and the three lines below, the subscript [Formula presented] (denoting the anti-collinear direction) was missed on the gauge field [Formula presented] and covariant derivative. Similarly, in Eq. (30) and the line below, the subscript c (denoting the collinear direction) was missed on the gauge field.• In Eq. (32), in the first factor after the equality sign [Formula presented] should be replaced by [Formula presented].