Speaker
Roger Horsley
(University of Edinburgh)
Description
Computing the gluon component of momentum in the nucleon is a difficult and computationally expensive problem, as the matrix element involves a quark-line-disconnected gluon operator which suffers from ultra-violet fluctuations. But also necessary for a successful determination is the non-perturbative renormalisation of this operator. We investigate this renormalisation here by using two methods: enforcing the energy-momentum sum rule and also by direct computation in the RI mom scheme. A clear statistical signal is obtained in the direct calculation by an adaption of the Feynman-Hellmann technique. In the case of quenched fermions good agreement is found between both approaches.
Authors
Roger Horsley
(University of Edinburgh)
Tomas Howson
Waseem Kamleh
(University of Adelaide)
Yoshifumi Nakamura
Holger Perlt
(University of Leipzig)
Paul Rakow
(University of Liverpool)
Gerrit Schierholz
(DESY)
Hinnerk Stuben
Ross Young
(University of Adelaide)
James Zanotti
(University of Adelaide)
