TY  - JOUR
AU  - Cui, Z. F.
AU  - Ding, M.
AU  - Morgado, J. M.
AU  - Raya, K.
AU  - Binosi, D.
AU  - Chang, L.
AU  - Papavassiliou, J.
AU  - Roberts, C. D.
AU  - Rodriguez-Quintero, J.
AU  - Schmidt, S. M.
PY  - 2022
DA  - 2022//
TI  - Concerning pion parton distributions
T2  - Eur. Phys. J. A
JO  - European Physical Journal A
SP  - 10
EP  - 14pp
VL  - 58
IS  - 1
PB  - Springer
AB  - 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.
SN  - 1434-6001
UR  - https://arxiv.org/abs/2112.09210
UR  - https://doi.org/10.1140/epja/s10050-021-00658-7
DO  - 10.1140/epja/s10050-021-00658-7
LA  - English
N1  - WOS:000746605900001
ID  - Cui_etal2022
ER  -