Tensor Charge of the Nucleon in Lattice QCD

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First results of lattice QCD simulation on the nucleon tensor-charge δq are presented. From the quenched QCD simulations with the Wilson quark action at β= 5.7 on a 16³× 20 lattice and on a 12³× 20 lattice, we find (i) the connected part δqcon. is determined with small statistical error, (ii) the disconnected part δqdis., which violates the OZI rule, is consistent with zero, and (iii) the flavor-singlet tensor charge δΣ(μ² = 2 GeV²) = δu + δd + δs takes 0.562(88) at β=5.7, which is in contrast with the flavor-singlet axial charge ΔΣ= 0.1-0.3.