RT Journal Article
T1 Basic features of the pion valence-quark distribution function
A1 Chang, L.
A1 Mezrag, Cédric
A1 Moutarde, Hervé
A1 Roberts, Craig D.
A1 Rodríguez Quintero, José
A1 Tandy, Peter
AB The impulse-approximation expression used hitherto to define the pion’s valence-quark distributionfunction 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 viathe rainbow–ladder truncation, or any practical analogue, carry all the pion’s light-front momentum ata 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 availableempirical information, we use an algebraic model to express the principal impact of both classes ofcorrections. This enables a realistic comparison with experiment that allows us to highlight the basicfeatures of the pion’s measurable valence-quark distribution, qπ (x); namely, at a characteristic hadronicscale, qπ (x) ∼ (1 − x)2 for x  0.85; and the valence-quarks carry approximately two-thirds of the pion’slight-front momentum.
PB Elsevier
SN 1873-2445
YR 2014
FD 2014-08
LK http://hdl.handle.net/10272/18417
UL http://hdl.handle.net/10272/18417
LA eng
NO Chang, L., Mezrag, C., Moutarde, H., Roberts, C. D., Rodríguez Quintero, J., & Tandy, P. C. (2014). Basic features of the pion valence-quark distribution function. Physics Letters B, 737, 23–29. DOI: https://doi.org/10.1016/j.physletb.2014.08.009
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026