398,110 research outputs found
Term and Quark Spin Content of the Nucleon
We report results of our calculation on the term and quark spin
content of the nucleon on the quenched lattice at . The disconnected insertions which involve contributions from the sea
quarks are calculated with the stochastic noise algorithm. As a physical
test of the algorithm, we show that the forward matrix elements of the vector
and pseudoscalar currents for the disconnected insertions are indeed consistent
with the known results of zero. We tried the Wuppertal smeared source and found
it to be more noisy than the point source. With unrenormalized
MeV, we find the term to be MeV. The
strange quark condensate in the nucleon is large, i.e. . For the quark spin content, we find
, , and . The flavor-singlet axial charge .Comment: contribution to Lattice '94; 3 page uuencoded ps fil
On intertwining operators and finite automorphism groups of vertex operator algebras
Let V be a simple vertex operator algebra and G a finite automorphism group.
We give a construction of intertwining operators for irreducible V^G-modules
which occur as submodules of irreducible V-modules by using intertwining
operators for V. We also determine some fusion rules for a vertex operator
algebra as an application.Comment: 26 page
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