Abstract
The possibility of imposing partially twisted boundary conditions is investigated for the scalar sector of lattice QCD. According to the commonly shared belief, the presence of quark-antiquark annihilation diagrams in the intermediate state generally hinders the use of the partial twisting. Using effective field theory techniques in a finite volume, and studying the scalar sector of QCD with total isospin I = 1, we however demonstrate that partial twisting can still be performed, despite the fact that annihilation diagrams are present. The reason for this are delicate cancellations, which emerge due to the graded symmetry in partially quenched QCD with valence, sea and ghost quarks. The modified Lüscher equation in case of partial twisting is given.
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Agadjanov, D., Meißner, UG. & Rusetsky, A. Partial twisting for scalar mesons. J. High Energ. Phys. 2014, 103 (2014). https://doi.org/10.1007/JHEP01(2014)103
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DOI: https://doi.org/10.1007/JHEP01(2014)103