期刊
PHYSICS LETTERS B
卷 737, 期 -, 页码 23-29出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2014.08.009
关键词
Deep inelastic scattering; Drell-Yan process; Dynamical chiral symmetry breaking; Dyson-Schwinger equations; pi-meson; Parton distribution functions
资金
- University of Adelaide and Australian Research Council [FL0992247]
- Commissariat a l'Energie Atomique
- Joint Research Activity Study of Strongly Interacting Matter under the Seventh Framework Programme of the European Community [283286]
- Chromodynamique Quantique et Physique des Hadrons [GDR 3034 PH-QCD]
- PARTONS [ANR-12-MONU-0008-01]
- Spanish ministry Research Project [FPA2011-23781]
- U.S. Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357]
- National Science Foundation [NSF-PHY1206187]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1206187] Funding Source: National Science Foundation
The impulse-approximation expression used hitherto to define the pion's valence-quark distribution function is flawed because it omits contributions from the gluons which bind quarks into the pion. A corrected leading-order expression produces the model-independent result that quarks dressed via the rainbow-ladder truncation, or any practical analogue, carry all the pion's light-front momentum at a characteristic hadronic scale. Corrections to the leading contribution may be divided into two classes, responsible for shifting dressed-quark momentum into glue and sea-quarks. Working with available empirical information, we use an algebraic model to express the principal impact of both classes of corrections. This enables a realistic comparison with experiment that allows us to highlight the basic features of the pion's measurable valence-quark distribution, q(pi) (x); namely, at a characteristic hadronic scale, q(pi) (x) similar to (1 - x)(2) for x greater than or similar to 0.85; and the valence-quarks carry approximately two-thirds of the pion's light-front momentum. (C) 2014 Argonne National Laboratory and the authors. Published by Elsevier B.V.
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