Multiquark evolution in QCD [electronic resource].

Published:: Menlo Park, Calif. : Stanford Linear Accelerator Center, 1985.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: Pages: 8 : digital, PDF file
Additional Creators:: Stanford Linear Accelerator Center and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

We present a formalism for the evolution in Q/sub 2/ of multiquark systems as an application of perturbative quantum chromodynamics (QCD) to asymptotic, exclusive nuclear amplitudes. To leading terms in log Q/sup 2/ our formalism is equivalent to solving the renormalization group equations for these amplitudes. Completely antisymmetric multiquark color-singlet represntations are constructed and their evolution is investigated from the one-gluon exchange kernel. We argue that the evolution equation, together with a cluster decomposition, demonstrates a transition from the traditional meson and nucleon degrees of freedom of nuclear physics to quark and gluon degrees of freedom with increasing Q/sup 2/, or at small internucleon separation. As an example, we derive an evolution equation for a completely antisymmetric six-quark distribution amplitude and solve the evolution equation for a deuteron S-wave amplitude. The leading anomalous dimension and the corresponding eigensolution are found for the deuteron in order to predict the asymptotic form of the deuteron distribution amplitude (i.e., light-cone wave function at short distances). The fact that the six-quark state is 80 percent hidden color at small transverse separation implies that the deuteron form factor cannot be described at large Q/sup 2/ by meson-nucleon degrees of freedom alone. Furthermore, since the N-N channel is very suppressed under these conditions, the effective nucleon-nucleon potential is naturally repulsive at short distances. 20 refs.

Report Numbers:

E 1.99:slac-pub-3787
E 1.99: conf-8508127-6
conf-8508127-6
slac-pub-3787

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Note:

Published through SciTech Connect.
09/01/1985.
"slac-pub-3787"
" conf-8508127-6"
"DE86002941"
Nuclear chromodynamics conference, Santa Barbara, CA, USA, 12 Aug 1985.
Ji, C.R.

Funding Information:

AC03-76SF00515

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