Strangeness and charm content of the nucleon

Andreas Schaefer (QCDSF Collaboration); Gunnar Bali; Sara Collins

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arxiv 0911.2407 v1 pith:4PGUVV64 submitted 2009-11-12 hep-lat hep-ph

Strangeness and charm content of the nucleon

Gunnar Bali , Sara Collins , Andreas Schaefer (QCDSF Collaboration) This is my paper

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keywords nucleonstrangenesscharmmassspinvalueconfigurationscontent

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We present results on the scalar strangeness and charm contents of the nucleon and of the disconnected contributions to the nucleon spin. These are obtained on two flavour non-perturbatively improved Sheikholeslami-Wilson configurations at a pseudoscalar mass of 290 MeV. We quote f_{T_s} = m_s<N|ss|N>/m_N< = 0.070(22) as our preliminary value for the strange quark fraction of the nucleon mass and a modified minimal subtraction scheme value Delta s = -0.015(10), with as yet unknown systematics, for the strangeness contribution to the spin.

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