Strangeness and charm content of the nucleon

Details Strangeness and charm content of the nucleon Strangeness and charm content of the nucleon

2009-11-12

arxiv.org/abs/0911.2407v1

PoS LAT2009:149,2009

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 5 figures, talk presented at The XXVI International Symposium on Lattice Field Theory (LAT2009), July 26-31 2009, Pek

Scientific paper

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/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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