Results 81 to 90 of about 4,122 (216)
Perturbative and non-perturbative QCD
, 2006 In these lectures we give a concise introduction to the ideas of renormalon calculus in QED and QCD. We focus in particular on the example of the Adler D function of vacuum polarization, and on relations between perturbative renormalon ambiguities and corresponding non-perturbative Operator Product Expansion (OPE) ambiguities.
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Annalen der Physik, Volume 536, Issue 1, January 2024.A primer on axion physics, emphasizing an intuitive understanding of why the axion solves the strong CP problem. Abstract The canonical axion potential is reviewed, with an emphasis on the field theory underlying radial and angular modes of complex scalar fields.
Felix Yu
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Generic Axion Maxwell Equations: Path Integral Approach
Annalen der Physik, Volume 536, Issue 1, January 2024.It is possible that the interactions between axions and electromagnetic field are mediated by heavy dyons. In this article, the corresponding axion Maxwell equations are derived using the path integral approach. These equations feature novel axion‐dependent terms which can lead to unique signatures in light‐shining‐through‐wall and haloscope ...
Anton V. Sokolov, Andreas Ringwald
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From microscopic interactions to the dynamics of the fireball
EPJ Web of Conferences, 2014 .We discuss recent applications of the partonic perturbative QCD based cascade model BAMPS with focus on heavy-ion phenomenology in the hard and soft momentum range.
Bouras I. +8 more
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, 1999 This series of lectures consists of two parts. In the first part the foundations of perturbative and non perturbative formulation are discussed. The ambiguity in the definition of vacuum condensates is then analyzed. In the second part the symmetry patterns of the deconfining phase transition are discussed.
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On the description of exotic hadron states within QCD sum rules
EPJ Web of Conferences, 2017 Revisiting the QCD sum-rule description of exotic hadron states, we argue that, in order to arrive at trustable analyses of, for instance, strong decay widths of multiquarks, it is inevitable to adopt the QCD sum-rule approach beyond the leading ...
Lucha Wolfgang, Melikhov Dmitri
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, 1999 There are indications of a faith transition in QCD: The strong coupling may freeze at a sufficiently low value to make PQCD relevant even in the confining regime. The properties of PQCD at low Q^2 depend on the asymptotic field configuration assumed at t=\pm\infty.
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Controlling quark mass determinations non-perturbatively in three-flavour QCD
EPJ Web of Conferences, 2017 The determination of quark masses from lattice QCD simulations requires a non-perturbative renormalization procedure and subsequent scale evolution to high energies, where a conversion to the commonly used MS¯$\overline {{\rm{MS}}} $ scheme can be safely
Campos Isabel +5 more
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Transition to Perturbative QCD
Journal of Physics: Conference Series, 2011 We review the Jefferson Lab program concerning the interplay between hadronic and underlying quark degrees of freedom in exclusive reactions. Much of the program was initially based on predictions from perturbative QCD (pQCD) concerning scaling of reaction cross sections, helicity conservation, and asymptotic behavior of form factors.
R Gilman, R J Holt, P Stoler
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