Speaker
Description
The formalism of short-distance factorization, conveyed through the pseudo-distribution approach, allows for the extraction of lightcone correlators from field theories formulated on Euclidean geometries. Thus, within this formalism, the extraction of parton distributions from Lattice-QCD becomes feasible. In this work we take advantage of the pseudo-distribution idea to compute, for the first time, the $t$-dependent parton distribution function of the $\eta_{c}$-meson. To this end we take advantage of the $N_{f}=2$ ensembles of gauge configurations generated by the CLS effort to compute the $\eta_{c}$-meson's pseudo-parton distribution function. Using twisted-boundary conditions we achieve its calculation on a wide Ioffe-time range, and a number of $t$-values. Finally, exploiting next-to-leading order matching relations for pseudo-distributions allows for the extraction of the looked forward $t$-dependent parton distribution functions. The $\eta_{c}$ being a heavy pseudoscalar meson, direct comparison with the corresponding results available for lighter ones -- say, pions -- allows for a pioneering unbiased estimate of the effect induced by the Higgs-mechanism on the structure of hadrons and the origin of hadron masses.
