Speaker
Dr
James Zanotti
(University of Adelaide)
Description
By introducing an external spin operator to the fermion action, the
quark-line connected matrix elements relevant for quark spin fractions
of hadrons are extracted from the linear response of the hadron
energies using the Feynman-Hellmann (FH) theorem. At the SU(3)-flavour
symmetry point, we find that the connected quark spin fractions are
universally in the range 55-70% for vector mesons and octet and
decuplet baryons. There is an indication that the amount of spin
suppression is quite sensitive to the strength of SU(3) breaking.
Finally, I also hope to present preliminary results applying the FH
technique to calculations of quark line disconnected contributions to
hadronic matrix elements.
Primary author
Dr
James Zanotti
(University of Adelaide)
Co-authors
Mr
Alexander Chambers
(University of Adelaide)
Dr
Arwed Schiller
(Leipzig University)
Dr
Dirk Pleiter
(JSC, Juelich Research Centre)
Prof.
Gerrit Schierholz
(DESY)
Dr
Hinnerk Stueben
(Hamburg University)
Dr
Holger Perlt
(Leipzig university)
Dr
Paul Rakow
(University of Liverpool)
Dr
Roger Horsley
(University of Edinburgh)
Dr
Ross Young
(University of Adelaide)
Dr
Yoshifumi Nakamura
(RIKEN Advanced Institute for Computational Science)
