Structure of Vacuum Condensates
نویسنده
چکیده
It is essential to know the space-time structure of the nonlocal vacuum condensates for application to medium energy processes. Using the DysonSchwinger formalism in the rainbow approximation for the quark propagator, we study the nonlocal quark condensate and model forms for the nonperturbative gluon propagator constrained by fits to local condensates and deep inelastic scattering with nucleon targets. 12.38.Lg, 12.38.Aw, 13.60.Hb Typeset using REVTEX
منابع مشابه
Vacuum Structure in Qcd with Quark and Gluon Condensates
We consider here the vacuum structure in QCD with both quark and gluon condensates and a variational ansatz for the ground state. The method is nonperturbative using only equal time algebra for the field operators. We then find that a constrained energy minimisation of the Hamiltonian leads to a QCD vacuum with both quark and gluon condensates for αs > αc = 0.62. Pion decay constant and the cha...
متن کاملGluon condensate and the vacuum structure of QCD
Phenomenological evidence and analytic approximations to the QCD ground state suggest a complex gluon condensate structure. Exclusion of elementary fermion excitations by the generation of infinite mass corrections is a consequence. In addition the existence of vacuum condensates in unbroken non-abelian gauge theories, endows SU(3) and higher order groups with a non-trivial structure in the man...
متن کاملIp/bbsr/94-15 Vacuum Structure in Qcd with Quark and Gluon Condensates
We consider here the vacuum structure in QCD with both quark and gluon condensates and a variational ansatz for the ground state. The method is nonperturbative using only equal time algebra for the eld operators. We then nd that a constrained energy minimisation of the Hamiltonian leads to a QCD vacuum with both quark and gluon condensates for s > c = 0:62. Pion decay constant and the charge ra...
متن کاملThe Role of the Qcd Vacuum in the Heavy-quark Bound State Dynamics A
It is well known that the complex structure of the QCD vacuum can, in some regimes, be parametrized by local vacuum condensates, i.e. the expectation values of operators where all the perturbative vacuum fluctuations are taken out at the best of our ability . The first attempt to calculate the effect of non-perturbative vacuum condensates on the energy levels of heavy quarkonia was performed in...
متن کاملEstimates of higher – dimensional vacuum condensates from the instanton vacuum
We calculate the values of non-factorizable dimension{7 vacuum condensates in the instanton vacuum. We comment on a method, recently proposed by Oganesian, to estimate the dimension{7 condensates by factorization of dimension{10 condensates in various inequivalent ways. The instanton estimates could be used to analyze the stability of QCD sum rules with increasing dimensions. PACS: 12.38.Lg, 11...
متن کامل