Non-perturbative renormalization of quark bilinear operators with $N_f$ = 2 (tmQCD) Wilson fermions and the tree-level improved gauge action - INSPIRE

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Non-perturbative renormalization of quark bilinear operators with $N_f$ = 2 (tmQCD) Wilson fermions and the tree-level improved gauge action

ETM

Collaboration

•

M. Constantinou
(
- Cyprus U.
)

Apr, 2010

32 pages

Published in:

JHEP 08 (2010) 068

e-Print:

1004.1115 [hep-lat]

DOI:

10.1007/JHEP08(2010)068

Report number:

DESY-10-037,
RM3-TH-10-6,
ROME1-1468,
ROM2F-2010-06

Experiments:

LATTICE-ETM

View in:

ADS Abstract Service

reference search134 citations

Citations per year

Abstract: (arXiv)

We present results for the renormalization constants of bilinear quark operators obtained by using the tree-level Symanzik improved gauge action and the Nf=2 twisted mass fermion action at maximal twist, which guarantees automatic O(a)-improvement. Our results are also relevant for the corresponding standard (un-twisted) Wilson fermionic action since the two actions only differ, in the massless limit, by a chiral rotation of the quark fields. The scale-independent renormalization constants ZV, ZA and the ratio ZP/ZS have been computed using the RI-MOM approach, as well as other alternative methods. For ZA and ZP/ZS, the latter are based on both standard twisted mass and Osterwalder-Seiler fermions, while for ZV a Ward Identity has been used. The quark field renormalization constant Zq and the scale dependent renormalization constants ZS, ZP and ZT are determined in the RI-MOM scheme. Leading discretization effects of O(g^2 a^2), evaluated in one-loop perturbation theory, are explicitly subtracted from the RI-MOM estimates.

Note:

31 pages, 11 figures

Lattice QCD
Renormalization Regularization and Renormalons
quantum chromodynamics
fermion: Wilson
mass: twist
flavor: 2
renormalization: nonperturbative
quark: operator
fermion: mass
effect: discrete

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