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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
Department of Physics, University of Cyprus.
Dipartimento di Fisica, Sapienza, Università di Roma.
Dipartimento di Fisica, Università di Roma.
NIC, DESY.
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2010 (Engelska)Ingår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 8, artikel-id 068Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We present results for the renormalization constants of bilinear quark operators obtained by using the tree-level Symanzik improved gauge action and the N f = 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 Z V, Z A and the ratio Z P /Z S have been computed using the RI-MOMapproach, as well as other alternative methods. For Z A and Z P /Z S, the latter are based on both standard twisted mass and Osterwalder-Seiler fermions, while for Z V a Ward Identity has been used. The quark field renormalization constant Z q and the scale dependent renormalization constants Z S, Z P and Z T are determined in the RI-MOM scheme. Leading discretization effects of O(g 2a 2), evaluated in one-loop perturbation theory, are explicitly subtracted from the RI-MOM estimates

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2010. Vol. 8, artikel-id 068
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URN: urn:nbn:se:ltu:diva-65426DOI: 10.1007/JHEP08(2010)068Scopus ID: 2-s2.0-84856381757OAI: oai:DiVA.org:ltu-65426DiVA, id: diva2:1137208
Tillgänglig från: 2017-08-30 Skapad: 2017-08-30 Senast uppdaterad: 2017-11-24Bibliografiskt granskad

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