Three-loop matching of heavy flavor-changing (axial-)tensor currents

Abstract

We present the three-loop calculations of the nonrelativistic QCD (NRQCD) current renormalization constants and corresponding anomalous dimensions, and the matching coefficients for the spatial-temporal tensor and spatial-spatial axial-tensor currents with two different heavy quark masses. We obtain the convergent decay constant ratio up to the next-to-next-to-next-to-leading order (N${}^3$LO) for the $S$-wave vector meson $B_c^{\ast }$ involving the tensor and axial-tensor currents. We obtain the three-loop finite (${ϵ}^0$) term in the ratio of the QCD heavy flavor-changing tensor current renormalization constant in the on-shell ($\mathrm{OS}$) scheme to that in the modified-minimal-subtraction ($\overline{\mathrm{MS}}$) scheme, which is helpful to obtain the three-loop matching coefficients for all heavy flavor-changing (axial-)tensor currents.