Lu, YaXu, YinzhenRaya, KhépaniRoberts, Craig D.Rodríguez Quintero, José2024-05-082024-05-082024-02Lu, Y., Xu, Y.-Z., Raya, K., Roberts, C. D., & Rodríguez-Quintero, J. (2024). Pion distribution functions from low-order Mellin moments. In Physics Letters B (Vol. 850, p. 138534). Elsevier BV. https://doi.org/10.1016/j.physletb.2024.1385340370-26931873-2445 (electrónico)https://hdl.handle.net/10272/23641Exploiting an evolution scheme for parton distribution functions (DFs) that is all-orders exact, contemporary lattice-QCD (lQCD) results for low-order Mellin moments of the pion valence quark DF are shown to be mutually consistent. The analysis introduces a means by which key odd moments can be obtained from the even moments in circumstances where only the latter are available. Combining these elements, one arrives at parameter-free lQCD-based predictions for the pointwise behaviour of pion valence, glue, and sea DFs, with sound uncertainty estimates. The behaviour of the pion DFs at large light-front momentum fraction, x>0.85, is found to be consistent with QCD expectations and continuum analyses of pion structure functions, i.e., damping like (1−x)βparton, with βvalence≈2.4, βglue≈3.6, βsea≈4.6. It may be possible to test these predictions using data from forthcoming experiments.engAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/Continuum and lattice Schwinger function methodsEmergence of massEvolution equationsParton distribution functionsPion structureQuantum chromodynamicsjournal article10.1016/j.physletb.2024.138534open access22 Física