20,156 research outputs found
Anomalously light states in super-Yang-Mills Chern-Simons theory
Inspired by our previous finding that supersymmetric Yang-Mills-Chern-Simons
(SYM-CS) theory dimensionally reduced to 1+1 dimensions possesses approximate
Bogomol'nyi-Prasad-Sommerfield (BPS) states, we study the analogous phenomenon
in the three-dimensional theory. Approximate BPS states in two dimensions have
masses which are nearly independent of the Yang-Mills coupling and proportional
to their average number of partons. These states are a reflection of the
exactly massless BPS states of the underlying pure SYM theory. In three
dimensions we find that this mechanism leads to anomalously light bound states.
While the mass scale is still proportional to the average number of partons
times the square of the CS coupling, the average number of partons in these
bound states changes with the Yang-Mills coupling. Therefore, the masses of
these states are not independent of the coupling. Our numerical calculations
are done using supersymmetric discrete light-cone quantization (SDLCQ).Comment: 14 pages, 3 figures, LaTe
Testing factorization
We briefly review the status of factorization in -decays. We discuss
several experimental tests of its nature and stress their importance. We show
that decays into mesons which have small decay constants or spin greater than
one (`designer mesons') offer a variety of new opportunities.Comment: Invited talk at the 9th International Symposium on Heavy Flavor
Physics (HF9), 10-13 September 2001, Caltech, Pasadena. To be published in
the proceedings; 8 pages, 1 figure, uses aippro
Numerical evidence for the Maldacena conjecture in two-dimensional N=(8,8) super Yang-Mills theory
The N=(8,8) super Yang-Mills theory in 1+1 dimensions is solved at strong
coupling to directly confirm the predictions of supergravity at weak coupling.
The calculations are done in the large-N_c approximation using Supersymmetric
Discrete Light-Cone Quantization. The stress-energy correlator is obtained as a
function of the separation r; for intermediate values of r, the correlator
behaves in a manner consistent with the 1/r^5 behavior predicted by
weak-coupling supergravity.Comment: 6 pages, 3 figures; requires espcrc2.sty; to appear in the
proceedings of the Workshop on Light-Cone QCD and Nonperturbative Hadron
Physics, Cairns, Australia, July 7-15, 200
Language, Law, Sports, and Culture: The Transferability or Non-Transferability of Words, Lifestyles, and Attitudes Through Law
Nonperturbative solution of supersymmetric gauge theories
Recent work on the numerical solution of supersymmetric gauge theories is
described. The method used is SDLCQ (supersymmetric discrete light-cone
quantization). An application to N=1 supersymmetric Yang-Mills theory in 2+1
dimensions at large N_c is summarized. The addition of a Chern-Simons term is
also discussed.Comment: 9 pages, LaTeX2e, ws-procs9x6; to appear in the proceedings of the
fifth workshop on Continuous Advances in QCD (Arkadyfest), Minneapolis,
Minnesota, May 17-23, 200
- …