Hyperfine Splitting and the Zeeman Effect in Holographic Heavy-Light Mesons

Understand

We inspect the mass spectrum of heavy-light mesons in deformed N=2 super Yang-Mills theory using the AdS/CFT correspondence.

• We demonstrate how some of the degeneracies of the supersymmetric meson spectrum can be removed upon breaking the supersymmetry, thus leading to the emergence of hyperfine structure.
• The explicit SUSY breaking scenarios we consider involve on one hand tilting one of the two fundamental D7 branes inside the internal R^6 space, and on the other hand applying an external magnetic field on the (untilted) branes.
• The latter scenario leads to the well-known Zeeman effect, which we inspect for both weak and strong magnetic fields.