Luescher-Weisz algorithm for excited states of the QCD flux-tube

Understand

We present a version of the Luescher-Weisz multilevel algorithm ideally suited for studying excited states of the QCD flux tube.

• While the original version achieved error reduction only in the temporal direction, the new algorithm reduces fluctuations in the sources as well.
• We report on the implementation of this algorithm as well as improvement over the older method.
• We also present first results, where we see a good agreement with theoretical predictions from bosonic string models.