Speaker
Description
In this talk, we study prospects for measuring the strong coupling $\alpha_s$ using the soft-drop jet-mass cross section in hadronic collisions. We compute the normalized cross section for quark and gluon jets to NNLL accuracy, and estimate the nonperturbative hadronization corrections using a model-independent field-theory based formalism involving $\mathcal{O}(\Lambda_{\rm QCD})$ constants for quark and gluon jets and perturbative Wilson coefficients computed to NLL’ accuracy. We clarify the impact of higher logarithmic resummation, that significantly modifies the leading logarithmic shape. Using these calculations, we assess the theoretical uncertainties on an $\alpha_s$-precision measurement due to scale variations, nonperturbative corrections, and quark/gluon fractions. We identify which soft-drop parameters are well-suited for measuring $\alpha_s$, and highlight differences in the $\alpha_s$ sensitivity between quark and gluon jets. This analysis thus paves the way for using soft-drop jet-mass cross section for a measurement of $\alpha_s$ at hadron colliders.
