# The 34th International Symposium on Lattice Field Theory (Lattice 2016)

24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

## Hadron Structure from the Feynman-Hellmann Theorem

25 Jul 2016, 17:05
20m
Building B2a Room 2077 (Highfield Campus, University of Southampton)

### 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)

 Slides