โ Scribed by A.A Migdal
No coin nor oath required. For personal study only.
A systematic procedure for the calculation of mesonic masses in QCD with large number of colors is proposed. The masses are expanded in terms of an auxiliary parameter OL, which is set to 1 at the end of the calculation. The expansion coefficients are expressed in general in terms of the Feynman integrals of QCD.
The terms of order an involve diagrams with n loops. Explicit expressions are found up to cya. These terms appear to be rather small, so that one may try to extrapolate to OL = 1. The qualitative properties of the spectrum are plausible, but for quantitative predictions further calculations are required.
๐ SIMILAR VOLUMES
We analyze subtracted dispersion relations for meson correlators at finite baryon density and temperature. Such relations are needed for QCD sum rules. We point out the importance of scattering terms, as well as finite, well-defined subtraction constants. Both are necessary for consistency, in parti