Concerning pion parton distributions

Autor: Z.-F. Cui, M. Ding, J. M. Morgado, K. Raya, D. Binosi, L. Chang, J. Papavassiliou, C. D. Roberts, J. Rodríguez-Quintero, S. M. Schmidt
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Digibug. Repositorio Institucional de la Universidad de Granada
instname
European Physical Journal A 58(2022), 10
Arias Montano. Repositorio Institucional de la Universidad de Huelva
The European physical journal / A 58(1), 10 (2022). doi:10.1140/epja/s10050-021-00658-7
ISSN: 2020-1133
Popis: We are grateful for constructive comments from K.-L. Cai, O. Denisov, F. de Soto, T. Frederico, J. Friedrich, C. Mezrag, V. Mokeev, W.-D. Nowak, C. Quintans, G. Salme and J. Segovia. Work supported by: National Natural Science Foundation of China (Grant nos. 12135007, 11805097); Helmholtz-Zentrum Dresden-Rossendorf High Potential Programme; Spanish Ministry of Science and Innovation (MICINN) (Grant nos. PID2020-113334GB, PID2019-107844GBC22); Generalitat Valenciana (Grant no. Prometeo/2019/087); Junta de Andalucia (Grant nos. P18-FR-5057, UHU-1264517, UHU EPIT2021); and STRONG-2020 "The strong interaction at the frontier of knowledge: fundamental research and applications" which received funding from the European Union's Horizon 2020 research and innovation programme (grant no. 824093).
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.
National Natural Science Foundation of China (NSFC) 12135007 11805097
Spanish Government European Commission PID2020-113334GB PID2019-107844GBC22
Generalitat Valenciana European Commission
General Electric Prometeo/2019/087
Junta de Andalucia P18-FR-5057 UHU-1264517 UHU EPIT2021
STRONG-2020 "The strong interaction at the frontier of knowledge: fundamental research and applications" - European Union's Horizon 2020 research and innovation programme 824093
Helmholtz-Zentrum Dresden-Rossendorf High Potential Programme
Databáze: OpenAIRE
Externí odkaz: