Renormalization of quark bilinear operators in a momentum-subtraction scheme with a nonexceptional subtraction point
Christian Sturm,Yasumichi Aoki,N. H. Christ,N. H. Christ,Taku Izubuchi,Taku Izubuchi,Christopher T. Sachrajda,A. Soni,A. Soni +8 more
TLDR
In this paper, the authors extended the RI/SMOM scheme for bilinear operators to one with a nonexceptional, symmetric subtraction point and derived conversion factors to convert results obtained in lattice calculations into the MS? scheme.Abstract:
We extend the Rome-Southampton regularization independent momentum-subtraction renormalization scheme (RI/MOM) for bilinear operators to one with a nonexceptional, symmetric subtraction point. Two-point Green’s functions with the insertion of quark bilinear operators are computed with scalar, pseudoscalar, vector, axial-vector and tensor operators at one-loop order in perturbative QCD. We call this new scheme RI/SMOM, where the S stands for “symmetric.” Conversion factors are derived, which connect the RI/SMOM scheme and the MS? scheme and can be used to convert results obtained in lattice calculations into the MS? scheme. Such a symmetric subtraction point involves nonexceptional momenta implying a lattice calculation with substantially suppressed contamination from infrared effects. Further, we find that the size of the one-loop corrections for these infrared improved kinematics is substantially decreased in the case of the pseudoscalar and scalar operator, suggesting a much better behaved perturbative series. Therefore it should allow us to reduce the error in the determination of the quark mass appreciably.read more
Citations
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FLAG Review 2019
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References
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Journal ArticleDOI
Strong-coupling constant at three loops in momentum subtraction scheme
TL;DR: In this article, the three-loop corrections to the β function in a momentum subtraction (MOM) scheme with a massive quark were performed in the background field formalism applying asymptotic expansions for small and large momenta.
Posted Content
Quark mass renormalization with non-exceptional momenta
TL;DR: In this article, the authors discuss the quark mass renormalization with non-exceptional momenta using 2+1 flavor domain wall fermions based on a recently proposed RI/SMOM scheme.
Proceedings ArticleDOI
Quark mass renormalization with non-exceptional momenta
TL;DR: In this paper, the authors discuss the quark mass renormalization with non-exceptional momenta using 2+1 flavor domain wall fermions based on a recen tly proposed RI/SMOM scheme.
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