Speaker
Mr
Alexander Chambers
(University of Adelaide)
Description
Although hadron structure calculations in lattice QCD
have improved greatly in recent years,
many problems still remain.
Various techniques for determining fermion line disconnected contributions to
matrix elements have produced exciting and promising results, but
rely on complicated analyses.
Additionally, calculations of electromagnetic form factors at high
momentum transfers remain limited by low signal-to-noise ratios.
In this talk we present results from Feynman-Hellmann motivated approaches
to determinations of these quantities.
We find disconnected contributions to $\Delta \Sigma$ consistent with
stochastic calculations, and are able to access
significantly higher momentum transfers for electromagnetic form
factors than have previously been feasible.
In conjunction with experimental data, these results may reveal interesting information
regarding the possibility of a zero crossing in the ratio of electric
and magnetic form factors in the nucleon.
Primary author
Mr
Alexander Chambers
(University of Adelaide)
Co-authors
Dr
Arwed Schiller
(University of Leipzig)
Prof.
Dirk Pleiter
(University of Regensburg)
Prof.
Gerrit Schierholz
(DESY)
Dr
Hinnerk Stüben
(University of Hamburg)
Dr
Holger Perlt
(Institute for Theoretical Physics, University of Leipzig)
Dr
James Zanotti
(University of Adelaide)
Dr
Paul Rakow
(University of Liverpool)
Dr
Roger Horsley
(University of Edinburgh)
Dr
Ross Young
(University of Adelaide)
Dr
Yoshifumi Nakamura
(RIKEN)
