Speaker
Description
We compute Mellin moments of the heavy-quark structure functions in deep inelastic
scattering at next-to-leading order in quantum chromodynamics, retaining their full
dependence on the heavy-quark mass. Using the optical theorem and the operator
product expansion, we derive analytic results for fixed Mellin moments N = 2 to 22
of the structure functions F2 and FL. Our results reproduce the known expressions in
the relevant asymptotic limits, in particular for virtualities of the exchanged photon
Q much larger than the heavy-quark mass m, and are in agreement with existing
parametrizations of the next-to-leading-order coefficient functions. The computational
set-up developed in this work also provides a direct pathway toward extending these
calculations to next-to-next-to-leading order.
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