Proton and pion distribution functions in counterpoint
MetadataShow full item record
Continuum Schwinger function methodsEmergence of massPion structureProton structureParton distributionsStrong interactions in the standard model of particle physics
Y. Lu, L. Chang, K. Raya et al. Proton and pion distribution functions in counterpoint. Physics Letters B 830 (2022) 137130 [https://doi.org/10.1016/j.physletb.2022.137130]
SponsorshipNational Natural Science Foundation of China 12135007; Ministerio de Ciencia e Innovación PID2019-107844GB-C22; Junta de Andalucía P18-FR-5057, UHU-1264517
Working with proton and pion valence distribution functions (DFs) determined consistently at the same, unique hadron scale and exploiting the possibility that there is an effective charge which defines an evolution scheme for DFs that is all-orders exact, we obtain a unified body of predictions for all proton and pion DFs – valence, glue, and four-flavour-separated sea. Whilst the hadron light-front momentum fractions carried by identifiable parton classes are the same for the proton and pion at any scale, the pointwise behaviour of the DFs is strongly hadron-dependent. All calculated distributions comply with quantum chromodynamics constraints on low-and high-xscaling behaviour and, owing to emergent hadron mass, pion DFs are the most dilated. These results aid in elucidating the sources of similarities and differences between proton and pion structure.