3 research outputs found
EMC and Polarized EMC Effects in Nuclei
We determine nuclear structure functions and quark distributions for Li,
B, N and Al. For the nucleon bound state we solve the
covariant quark-diquark equations in a confining Nambu--Jona-Lasinio model,
which yields excellent results for the free nucleon structure functions. The
nucleus is described using a relativistic shell model, including mean scalar
and vector fields that couple to the quarks in the nucleon. The nuclear
structure functions are then obtained as a convolution of the structure
function of the bound nucleon with the light-cone nucleon distributions. We
find that we are readily able to reproduce the EMC effect in finite nuclei and
confirm earlier nuclear matter studies that found a large polarized EMC effect.Comment: 8 pages, 9 figure
Symmetries of topological field theories in the BV-framework
Topological field theories of Schwarz-type generally admit symmetries whose
algebra does not close off-shell, e.g. the basic symmetries of BF models or
vector supersymmetry of the gauge-fixed action for Chern-Simons theory (this
symmetry being at the origin of the perturbative finiteness of the theory). We
present a detailed discussion of all these symmetries within the algebraic
approach to the Batalin-Vilkovisky formalism. Moreover, we discuss the general
algebraic construction of topological models of both Schwarz- and Witten-type.Comment: 30 page