Quantum Field Theory Approach to the Vacuum Replica in Qcd
نویسنده
چکیده
Quantum field theory is used to describe the contribution of possible new QCD vacuum replica to hadronic processes. This sigma-like new state has been recently shown to be likely to appear for any realistic four-quark interaction kernel as a consequence of chiral symmetry. The local operator creating the replica vacuum state is constructed explicitly. Applications to physical processes are outlined.
منابع مشابه
A New Approach to Perturbative Theory in the Nonperturbative Qcd Vacuum
Using stochastic quantization method [1], we derive gauge–invariant equations, connecting multilocal vacuum correlators of nonperturbative field configurations, immersed into the quantum background. Three alternative methods of stochastic regularization of these equations are suggested, and the corresponding regularized propagators of a background field are obtained in the lowest order of pertu...
متن کاملThe Qcd Trace Anomaly as a Vacuum Effect
(The vacuum is a medium is the message!) We use arguments taken from the electrodynamics of media to deduce the QCD trace anomaly from the expression for the vacuum energy in the presence of an external color magnetic field. Intuitive discussions of phenomena in quantum field theory frequently take the form of describing them as properties of the vacuum. The vacuum, it is then argued, is just l...
متن کاملVacuum 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 کاملThe QCD vacuum and its hadronic excitations
These lectures deal with the complex structure of the ground state, or vacuum, of Quantum Chromo Dynamics (QCD) and its low-energy excitations, the hadrons. QCD, the theory of quarks, gluons and their interactions, is a self-contained part of the Standard Model of elementary particles. It is a consistent quantum field theory with a simple and elegant underlying Lagrangian, based entirely on the...
متن کاملGauge–invariant nonlocal quark condensates in QCD
The QCD sum rules approach to non– perturbative phenomena in strong interaction physics consists in evaluating the power corrections of the product of two hadronic currents via the Operator Product Expansion (OPE), putting the relevant, unknown information about the non-perturbative vacuum structure in the values of local condensates (〈q̄(0)q(0)〉, 〈G(0)G(0)〉, etc.). However, it has been recogniz...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2002