Speaker
Description
An improvement to the widely used distillation technique is presented in the context of meson spectroscopy. Introducing meson profiles in distillation space and optimizing them for the different operators of interest significantly increases the overlap between the created states and the energy eigenstates at no considerable extra cost. These profiles give more versatility to the smearing technique, allowing to adapt it to the different operators and use it to reveal relevant spatial information. This improved version of distillation can also be extended to meson-glueball mixing calculations as well as to studies involving other hadronic operators where distillation is applicable. The proposed improvement is tested in two ensembles with N_f = 2 clover-improved Wilson quarks at half of the physical charm quark mass but different lattice volume and lattice spacing for the study of different quantum numbers. The resulting effective masses, together with the meson-glueball mixing, display the advantages of the improvement compared to standard distillation. Additionally, possible directions for further improvements to distillation related to the linear solver are briefly presented.