On the pinch technique beyond one loop
نویسندگان
چکیده
منابع مشابه
The Pinch Technique Beyond One Loop: The Gauge-Independent Two-Loop Quark Self-Energy
It is shown how the pinch technique algorithm may be consistently extended beyond the one-loop level to obtain the gauge-independent two-loop fermion self-energy −iΣ̂(p) in QCD in the pinch technique approach. The starting point for the construction is the general diagrammatic representation of the two-loop quark self-energy in terms of renormalized one-loop twoand three-point function and tree ...
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 کاملThe Two - Loop Pinch Technique in the Electroweak Sector Daniele
Abstract The generalization of the two-loop Pinch Technique to the Electroweak Sector of the Standard Model is presented. We restrict ourselves to the case of conserved external currents, and provide a detailed analysis of both the charged and neutral sectors. The crucial ingredient for this construction is the identification of the parts discarded during the pinching procedure with well-define...
متن کاملOn Resumming Inflationary Perturbations beyond One-loop
It is well known that the correlation functions of a scalar field in a quasi-de Sitter space exhibit at the loop level cumulative infra-red effects proportional to the total number of e-foldings of inflation. Using the in-in formalism, we explore the behavior of these infrared effects in the large N limit of an O(N) invariant scalar field theory with quartic selfinteractions. By resumming all h...
متن کاملar X iv : h ep - p h / 98 12 20 3 v 1 1 D ec 1 99 8 1 On the pinch technique beyond one loop
A brief account is given of the problems involved in extended the pinch technique beyond the one-loop level, and of investigations into one possible approach to solving them.
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 - Proceedings Supplements
سال: 1999
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(99)00191-7