出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：A large number of fundamental hadron structure observables are defined in the limit of vanishing
momentum transfer, but at the same time cannot be directly extracted from forward matrix
elements. This is a challenge for current lattice QCD simulations, where volumes and lattice
spacings are such that the lowest accessible non-zero momentum transfers are ∼ 0.15 GeV2 and
larger, making in general model-dependent extrapolations to the forward limit necessary. Twisted
boundary conditions for the valence quarks provide the opportunity to study hadronic matrix elements
in dynamical lattice QCD calculations for almost arbitrary hadron momenta. We present
preliminary results for the Dirac- and Pauli form factors and the form factors of the energy momentum
tensor for the nucleon very close to the forward limit, using partially twisted boundary
conditions. The calculations are based on gauge configurations generated with two flavors of
clover-improved Wilson fermions.
