A first extraction of gluon TMDs from Higgs data at the LHC

We present the first extraction of the unpolarised gluon transverse-momentum-dependent (TMD) parton distribution from Higgs-boson production data at the LHC within the framework of TMD factorisation. The analysis is based on the currently available set of ATLAS and CMS measurements of the Higgs qT distribution at √s = 8 and 13 TeV in the diphoton and four-lepton decay channels, restricted to the small-qT region where TMD factorisation is applicable. Theoretical predictions are computed up to N3LL accuracy, with the contribution of the linearly polarised gluon TMD h⊥g 1 accounted for. Fiducial selections are consistently incorporated for both two- (diphoton) and four-body (four-lepton) final states. The fit reproduces both the shape and the normalisation of the experimental data, and yields a moderate sensitivity to the nonperturbative content of gluon TMDs. We further assess the convergence of the perturbative expansion and the stability of the extracted distribution under variations of the qT cut. This analysis provides a baseline for future extractions combining LHC Higgs measurements with other gluon-sensitive processes spanning a broader range of hard scales.