Quarks and gluons in hadrons and nuclei Page: 28 of 31
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= 1.40 * 0.06 0.04
-incoherent 0.94 0.02 0.03
This suggests that gluons are shadowed in nuclei.
There are also confusing signals52 coming from E537 who probe the gluon dis-
tribution with n- W/Be +* ... at 125 GeV, measuring the xF distributions and
thereby enabling gW/Be to be measured for xBj 0.2. If xF = - x2, then for J/ j
production at 125 GeV
xF - 5x - x
Thus, we can replot the
lent to gW (x)/gBe(x) orly if
data from E537 against X2 (Fig. 2). This is equiva-
g(W) * gw(Be) cancels out. However, we have no
Fig. 2. Ratio of t, production in i-W/i-Be from
of gW/gBe(x), plotted against x-Bjorken for the
E537 (Ref. 52) which is indicative
nuclear target (x2).
immediate way of knowing if this is true empirically as Q2(=m ) is fixed. Prima
facie, one may justifiably be worried. First, which is theoretical prejudice, if
Fig. (2) is interpreted as gW/Be(x), it implies that gluons are significantly
shadowed for x as large as 0.2. Our understanding of shadowing is still rather
primitive. but such behavior would be against all current models.
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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/m1/28/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.