Yitzhak Frishman
Professor Emeritus
Department of Particle Physics
Weizmann Institute
76100 Rehovot
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Current Research Interests
The main line of research is in the area of non-abelian gauge theories, which within the standard model
describe strong, electromagnetic and weak interactions
as observed in Nature.
A particular aspect is that of deep-inelastic scattering of electrons, muons and neutrinos off hadrons.
In that connection, we developed the structure of operator products, in particular currents,
at almost light-like distances (see 1).
This expansion is a standard tool in investigating scattering experiments as above.
The leading experimentalists in those experiments, Friedman and Kendall and Taylor,
received a Nobel prize in 1990.
Another aspect is that of describing energy and momentum
in terms of products of currents.
We generalized the Sugawara construction to the non-abelian case, where the normal ordering effects
had to be taken into account, obtaining the second Casimir dependence in the coefficients.
These expressions are now being used in Conformal Field Theory as well as in String Theory (see 2).
To obtain the spectrum and various other properties of
states, strong coupling methods had to be developed.
These we did in two dimensional models (see 3 for review).
Recently, issues of confinement and screening in non-abelian gauge theories have been addressed.
In particular, the string tension was computed in various cases in model theories in two dimenstions.
More recently, we have computed the effective potential for meson-baryon scattering,
and then the transmission and reflection amplitudes (see papers in 4).
1. Y. Frishman
"Scale invariance and current commutators near the light
cone'',
Phys. Rev. Lett. vol 25, page 966 (1970).
2. R. Dashen and Y. Frishman
"Four-fermion interactions and scale invariance'',
Phys. Rev. vol D11, page 2781 (1975).
3. Y. Frishman and J. Sonnenschein
"Bosonization and QCD in Two Dimensions'',
Physics Reports, vol 223, No 6 (1993).
4. See papers in hep-th and hep-ph of http://xxx.tau.ac.il/
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