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We present a calculation of the strangeness and charmness contents<N|\bar{s}s|N> and <N|\bar{c}c|N> of the nucleon from dynamical lattice QCDwith 2+1 flavors. The calculation is performed with overlap valence quarks on2+1-flavor domain-wall fermion gauge configurations. The configurations aregenerated by the RBC collaboration on a 24^3*64 lattice with sea quark massam_l=0.005, am_s=0.04, and inverse lattice spacing a^{-1}=1.73GeV. Both actionshave chiral symmetry which is essential in avoiding contamination due to theoperator mixing with other flavors. Nucleon propagator and the quark loops areboth computed with stochastic grid sources, while low-mode substitution andlow-mode averaging methods are used respectively which substantially improvethe signal to noise ratio. We obtain the strangeness matrix element f_{T_{s}} =m_s <N|\bar{s}s|N> / M_N = 0.0334(62), and the charmness content f_{T_{c}} =m_c <N|\bar{c}c|N> / M_N = 0.094(31) which is resolved from zero by 3\sigmaprecision for the first time.

Strangeness and charmness content of nucleon from overlap fermions on 2+1-flavor domain-wall fermion configurations