The background field method beyond one loop
نویسندگان
چکیده
منابع مشابه
The Background Field Method beyond One Loop
The background field approach to multi-loop calculations in gauge field theories is presented. A relation between the gauge-invariant effective action computed using this method and the effective action of the conventional functional approach is derived. Feynman rules are given and renormalization is discussed. It is shown that the renormalization programme can be carried out without any refere...
متن کاملRenormalons Beyond One-Loop
Higher order renormalons beyond the chain of one-loop bubbles are discussed. A perturbation method for the infrared renormalon residue is found. The large order behavior of the current-current correlation function due to the first infrared renormalon is determined in both QED and QCD to the first three orders.
متن کاملKl4 - DECAYS BEYOND ONE LOOP
The matrix elements for K → ππlν decays are described by four form factors F,G,H and R. We complete previous calculations by evaluating R at next-to-leading order in the low-energy expansion. We then estimate higher order contributions using dispersion relations and determine the low-energy constants L1, L2 and L3 from data on Ke4 decays and on elastic pion scattering. Finally, we present predi...
متن کاملTwo Loop Finiteness of Chern-Simons Field Theory in Background Field Method
Two-loop calculation of Chern-Simons field theory in background field method is performed. It is explictly shown that the pole terms cancel exactly and hence two-loop finiteness of Chern-Simons field theory is verified.
متن کاملChiral Perturbation Theory Beyond One Loop
The existing Chiral Perturbation Theory (ChPT) calculations at order p6 are reviewed. The principles of ChPT and how they are used are introduced. The main part is a review of the twoand three-flavour full two-loop calculations and their comparison with experiment. We restrict the discussion to the mesonic purely strong and semileptonic sector. The review concludes by mentioning the existing re...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1981
ISSN: 0550-3213
DOI: 10.1016/0550-3213(81)90371-0