Speaker
Yan Li
(University of cyprus)
Description
We investigate contributions of excited states to nucleon matrix elements by studying the two- and three-point functions using nucleon and pion-nucleon interpolating fields. This study is made using twisted mass fermion ensembles with pion masses 346 MeV and 131 MeV. We construct an improved nucleon interpolating field with the generalized eigenvalue problem of two-point functions, and use it to study three-point functions. This method itself is also discussed in more details. We compare results obtained using these two ensembles and show preliminary results for nucleon charges.
Primary authors
Constantia Alexandrou
Giannis Koutsou
(The Cyprus Institute)
Yan Li
(University of cyprus)
Marcus Petschlies
(Helmholtz-Institut für Strahlen- und Kernphysik)
Ferenc Pittler
(Helmholtz-Institut für Strahlen- und Kernphysik)
