Quarks and gluons in hadrons and nuclei Page: 2 of 31
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Quarks and Gluons in Hadrons and Nuclei
F. E. Close
Oak Ridge National Laboratory*, Oak Ridge, TN 37831-6373
University of Tennessee, Knoxville, TN 37996-1200
These lectures discuss (1) the particle-nuclear interface - a general intro-
duction to the ideas and application of colored quarks in nuclear physics, (2)
color, the Pauli principle, and spin flavor correlations - this lecture shows how
the magnetic moments of hadrons relate to the underlying color degree of freedom,
and (3) the proton's spin - a quark model perspective. This lecture reviews
recent excitement which has led some to claim that in deep inelastic polarized
lepton scattering very little of the spin of a polarized proton is due to its
quarks. Lecture (4) discusses the distribution functions of quarks and gluons in
nucleons and nuclei, and how knowledge of these is necessary before some quark-
gluon plasma searches can be analyzed.
1. THE PARTICLE-NUCLEAR INTERFACE
Once upon a time nuclear physics was the study of nucleons and pions vibra-
ting and oscillating at the center of the atom; particle physics was the study of
nucleons and pions interacting and producing resonances. From the latter, people
gradually realized that hadrons are built from quarks; the fundamental rules
governing their interactions were deduced ("QCD" - quantum chromodynamics) and the
similarities with QED suggested the possibility that all of the natural forces can
be described in a grand unified theory. Today, particle physics deals with ques-
tions ranging from .he origins of matter in the first microseconds of the uni-
verse, whose experimental investigation requires the energies of the SSC, down to
the quark structure of protons and nuclei that can be studied at relatively low
Nuclear physics theory has taken QCD on board. There are still detailed
studies going on in nuclear excitations and there are important overlaps with
nuclear astrophysics. The field is very rich. The attempt to understand nuclear
phenomena at the quark level causes many nuclear physicists to be concerned with
the same sort of problems as their colleagues in particle physics.
During the last three years, there has been a blossoming in this overlap area
which I would like to call "hadron physics". I would like to make the following
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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/m1/2/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.