Corrigendum to “Threshold expansion of the gg(qq¯)→QQ‾+X cross section at O(α_s ⁴)” [Phys. Lett. B 690 (2010) 483–490] (S0370269310006301) (10.1016/j.physletb.2010.05.038))

Ref. [1] noted that there is an additional contribution to the singular terms in the threshold expansion of the heavy-quark pair production cross section at [Formula presented] from the one-particle reducible vacuum polarization contribution [Figure presented] to the 2-loop virtual correction, which was omitted in our calculation. This affects only the quark–antiquark production channel [Formula presented]. In consequence the expression [Formula presented] must be added to Eq. (5), which changes the coefficient of the [Formula presented] term in Eq. (8) from 528.557 to 515.397. Eq. (8) should read correctly [Formula presented] The new term amounts to a reduction of the coefficient of [Formula presented] by 2.5%. The numerical effect on the total cross section is negligible. As discussed in Ref. [2] in the more general context of pair production of squarks and gluinos, the above additional term should be interpreted as a correction to the “Coulomb function” [Formula presented] in Eq. (1) from an annihilation contribution, here from [Formula presented], to the NRQCD Lagrangian. Accordingly, the term [Formula presented] should be added to the general result for [Formula presented] in Eq. (A.1). For a given heavy-particle state, [Formula presented] depends on the colour representation [Formula presented] and total spin S of the pair. For [Formula presented], only [Formula presented] is different from zero. Results for [Formula presented] as well as the quantity [Formula presented], which appears in Eq. (A.1), can be found in Ref. [2] for the case of pair production of squarks and gluinos.