RI/(S)MOM renormalizations of overlap quark bilinears with different levels of hypercubic smearing

Abstract

On configurations with 2+1-flavor dynamical domain-wall fermions, we calculate the RI/(S)MOM renormalization constants (RC) of overlap quark bilinears. Hypercubic (HYP) smearing is used to construct the overlap Dirac operator. We investigate the possible effects of the smearing on discretization errors in the RCs by varying the level of smearing from 0 to 1 and 2. The lattice is of size $32^3\times 64$ and with lattice spacing $1/a=2.383(9)$ GeV. The RCs in the $\overline{\mathrm{MS}}$ scheme at 2 GeV are given at the end, with the uncertainty of $Z_T$ reaching $\le 1$% for the tensor current. Results of the renormalized quark masses and hadron matrix elements show that the renormalization procedure suppresses the $\sim$ 30% difference of the bare quantities with or without HYP smearing into the 3%-5% level.

33 pages, 14 figures. Statistics increased for computing $Z_A$. Two graphs added for illustration. Main results not changed. References and acknowledgements added. Match the version published on Phys. Rev. D

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