English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A local and gauge invariant alternative version of QCD for massive fermionsintroduced in previous works, is considered here to just propose a theory whichincludes Nambu-Jona-Lasinio (NJL) terms in its defining action in arenormalizable form. The Lagrangian includes a special kind of new verticeswhich at first sight, look as breaking power counting renormalizability.However, these terms also modify the quark propagators, to become moredecreasing that the Dirac propagator at large momenta, indicating that thetheory is renormalizable. Therefore, it follows the surprising conclusion thatthe added NJL four fermions terms does not break renormalizability. Theapproach, can also be interpreted as a slightly generalized renormalizationprocedure for massless QCD, which seems able to incorporate the mass generatingproperties for the quarks of the NJL model, in a renormalizable way. Thestructure of the free propagator, given by the substraction between a massiveand a massless Dirac one in the Lee-Wick form, also suggests that the theoryretains unitarity, if the radiative corrections make the massless quarks becomenon propagating. The appearance of finite masses in the theory is justified bythe fact that the new action terms break chiral invariance. The scheme looks asbeing able to implement the Fritzsch Democratic Symmetry breaking approach toquark mass hierarchy. It seems also possible to further link the theory withthe SM after employing the Zimmermann's coupling constant reduction scheme in asimilar way as the Top quark condensation model had been approximatelyreformulated as a Higgs field one.

Is a generalized NJL model the effective action of massless QCD?