Spectrum of Yang-Mills Theory in D=3+1

Understand

We give a comparison of the spectrum of Yang-Mills theory in $D=3+1$, recently derived with a strong coupling expansion, with lattice data.

• We verify excellent agreement also for 2$^{++}$ glueball.
• A deep analogy with the $D=2+1$ case is obtained and a full quantum theory of this approach is also given.