Quarks and gluons in hadrons and nuclei Page: 27 of 31
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0 0.2 0.4
Fig. 1. Data from Ref. 49 on the ratio qFe D(x) from neutrino scattering. Here
q = (u=d=2s). The solid curve illustrates predictions of pion exchange model
(Refs. 46 and 49), the dot-dash is the pion model of Ref. 45, and the dashed curve
is the rescaling model, Ref. 44.
electromagnetic data for x < 0.1, again highlighting the need to see how shadowing
modifies the curves in Fig. 1 at small x.
4.4. Gluons in Nuclei
Insofar as inelastic yA + , + ... proceeds via photon-gluon fusion and NA +
+ ... involves gluon-gluon fusion, these processes probe gA(x). There have been
early claims that gA > gN (x ~ 0.05), this based on the EMC data50 for (yFe +
)/(yD + ' ...). Expressed as Aa this gave a = (1.10 0.03 0.04). However, it
is now less clear whether coherent i production (for which a = 4/3) has been
entirely removed from the data. Indeed E691 (Sokoloff et al.) reports1 that (at
Q = 0)
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Close, F. E. Quarks and gluons in hadrons and nuclei, article, December 1, 1989; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1058782/m1/27/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.