Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2010-06-25
Physics
High Energy Physics
High Energy Physics - Lattice
13 pages
Scientific paper
The low-lying energy excitations of 2-flavour QCD in the chiral limit confined to a small spatial box ($\delta$-regime) are that of an $O(4)$ rotator. In this work, we calculate the corrections due to the presence of a nonzero quark mass up to NNL order by means of dimensional regularised chiral perturbation theory. The final result for the energy gap of the system only involves the low-energy constants $F$, $\Lambda_1$, $\Lambda_2$ and $B$.
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