%0 Journal Article
%T Concerning pion parton distributions
%A Cui, Z. F.
%A Ding, M.
%A Morgado, J. M.
%A Raya, K.
%A Binosi, D.
%A Chang, L.
%A Papavassiliou, J.
%A Roberts, C. D.
%A Rodriguez-Quintero, J.
%A Schmidt, S. M.
%J European Physical Journal A
%D 2022
%V 58
%N 1
%I Springer
%@ 1434-6001
%G English
%F Cui_etal2022
%O WOS:000746605900001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5083), last updated on Mon, 31 Jan 2022 08:16:21 +0000
%X Analyses of the pion valence-quark distribution function (DF), u(pi) (x; sigma), which explicitly incorporate the behaviour of the pion wave function prescribed by quantum chromodynamics (QCD), predict u(pi) (x similar or equal to 1; sigma) similar to (1 – x)(beta(sigma)), beta(sigma greater than or similar to m(p)) > 2, where mp is the proton mass. Nevertheless, more than forty years after the first experiment to collect data suitable for extracting the x similar or equal to 1 behaviour of up, the empirical status remains uncertain because some methods used to fit existing data return a result for up that violates this constraint. Such disagreement entails one of the following conclusions: the analysis concerned is incomplete; not all data being considered are a true expression of qualities intrinsic to the pion; or QCD, as it is currently understood, is not the theory of strong interactions. New, precise data are necessary before a final conclusion is possible. In developing these positions, we exploit a single proposition, viz. there is an effective charge which defines an evolution scheme for parton DFs that is all-orders exact. This proposition has numerous corollaries, which can be used to test the character of any DF, whether fitted or calculated.
%R 10.1140/epja/s10050-021-00658-7
%U https://arxiv.org/abs/2112.09210
%U https://doi.org/10.1140/epja/s10050-021-00658-7
%P 10-14pp