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[en] By introducing an additional operator into the action and using the Feynman-Hellmann theorem we describe a method to determine both the quark line connected and disconnected terms of matrix elements. As an illustration of the method we calculate the gluon contribution (chromoelectric and chromo-magnetic components) to the nucleon mass.
Source
May 2012; 11 p; AD--12-24/T791; EDINBURGH--2012-06; LIVERPOOL-LTH--945; ISSN 0418-9833; 