The unpolarized two-loop massive pure singlet Wilson coefficients for deep-inelastic scattering

Understand

We calculate the massive two--loop pure singlet Wilson coefficients for heavy quark production in the unpolarized case analytically in the whole kinematic region and derive the threshold and asymptotic expansions.

• We also recalculate the corresponding massless two--loop Wilson coefficients.
• The complete expressions contain iterated integrals with elliptic letters.
• The contributing alphabets enlarge the Kummer-Poincar\'e letters by a series of square-root valued letters.