190 research outputs found
Including virtual photons in strong interactions
In the perturbative field-theoretical models we investigate the inclusion of
the electromagnetic interactions into the purely strong theory that describes
hadronic processes. In particular, we study the convention for splitting
electromagnetic and strong interactions and the ambiguity of such a splitting.
The issue of the interpretation of the parameters of the low-energy effective
field theory in the presence of electromagnetic interactions is addressed, as
well as the scale and gauge dependence of the effective theory couplings. We
hope, that the results of these studies are relevant for the electromagnetic
sector of ChPT.Comment: Talk presented at the International conference on Quarks and Nuclear
Physics, June 9-14, 2002, Juelich, German
The Spin Structure of the qq Interaction and the Mass Spectra of Bound q\bar q Systems: Different Versions of the 3-Dimensional Reductions of the Bethe-Salpeter Equation
Bound q\bar q -systems are considered in the framework of three different
versions of the 3-dimensional reduction of the Bethe-Salpeter equation, all
having the correct one-body limit when one of the constituent quark masses
tends to infinity, and in the framework of the Salpeter equation. The spin
structure of confining qq interaction potential is taken in the form
x\gamma_{1}^{0}\gamma_{2}^{0}+(1-x)I_{1}I_{2}, with 0 \leq x \leq 1. The
problem of existence (nonexistence) of stable solutions of 3-dimensional
relativistic equations for bound q\bar q systems is studied for different
values of x from this interval. Some other aspects of this problem are
discussed.Comment: 10 pages, LaTeX-file (article.sty
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