$\alpha_s$: The strength of the interaction between quarks and gluons (4/4)

by Prof. Rainer Sommer (DESY / Humboldt University)

Monday 14 Jul 2025, 13:15 → 14:15 Europe/Berlin

We present a determination of the strong coupling based on a community estimate of the scale $t_0$, combined with two strategies to extract the three-flavour Lambda parameter and the perturbative relation to the four- and five-flavour  theory. The uncertainty is significantly better than the previous world average of $\alpha_s$ and it is dominated by statistical errors. We will emphasise the error budget as well as implications of the result.

alpha_s_2025.pdf