Handling Excited States on the Lattice: The GEVP Method

preprint2011arXivOpen access

Abstract

High-precision calculations of hadron spectroscopy are a crucial task for Lattice QCD. State-of-the-art techniques are needed to disentangle the contributions from different energy states, such as solving the generalized eigenvalue problem (GEVP) for zero-momentum hadron correlators in an efficient way. We review the method and discuss its application in the determination of the BsB_s-meson spectrum using (quenched) nonperturbative HQET at order 1/mb1/m_b.

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