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21.03.2023 / 15:00 - 16:00 / Hamburg, SR2, building 2a
Theory SeminarFour-loop at large-nf: non-singlet structure functions in DIS
Andrea Pelloni (NIKHEF)
We have calculated the n_f^2 and n_f^3 contributions to the flavour non-singlet structure functions F_2 and F_L and most recently F_3 in inclusive deep-inelastic scattering at the fourth order in the strong coupling \alpha_s. The coefficient functions have been obtained by computing a very large number of Mellin-N moments using the method of differential equations and then determining the analytic forms in N and Bjorken-x from these. Our new n_f^2 terms are numerically much larger than the n3f leading large-nf parts which were already known; they agree with predictions of the threshold and high-energy resummations. I will present the methodology that was developed and used for obtaining these results together with prospects for further developments of this method in the exploration of nf contributions.
More Information: https://indico.desy.de/event/38077/
