The Strong Interaction: Quantum Chromodynamics and Gluons

1996 ◽  
pp. 77-77
Author(s):  
Byron P. Roe
Keyword(s):  
Quantum Chromodynamics ◽  
Strong Interaction

scholarly journals PERSISTENT CHALLENGES OF QUANTUM CHROMODYNAMICS

2006 ◽  
Vol 21 (28n29) ◽  
pp. 5695-5719 ◽  
Author(s):  
M. SHIFMAN
Keyword(s):  
Quantum Chromodynamics ◽  
Strong Interaction ◽  
Nuclear Physics ◽  
Weak Coupling ◽  
Weak Interactions ◽  
Question Mark ◽  
Color Confinement ◽  
Regge Behavior ◽  
Holographic Description ◽  
Interaction Phenomena

Unlike some models whose relevance to Nature is still a big question mark, Quantum Chromodynamics (QCD) will stay with us forever. QCD, born in 1973, is a very rich theory supposed to describe the widest range of strong interaction phenomena: from nuclear physics to Regge behavior at large E, from color confinement to quark–gluon matter at high densities/temperatures (neutron stars); the vast horizons of the hadronic world: chiral dynamics, glueballs, exotics, light and heavy quarkonia and mixtures thereof, exclusive and inclusive phenomena, interplay between strong forces and weak interactions, etc. Efforts aimed at solving the underlying theory, QCD, continue. In a remarkable entanglement, theoretical constructions of the 1970's and 1990's combine with today's ideas based on holographic description and strong–weak coupling duality, to provide new insights and a deeper understanding.

scholarly journals QCD on the Lattice

2020 ◽  
pp. 137-262
Author(s):  
Hartmut Wittig
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Ab Initio ◽  
Quantum Chromodynamics ◽  
Lattice Qcd ◽  
Strong Interaction ◽  
Quantum Field ◽  
Low Energies ◽  
Lattice Approach ◽  
Established Technique

AbstractSince Wilson’s seminal papers of the mid-1970s, the lattice approach to Quantum Chromodynamics has become increasingly important for the study of the strong interaction at low energies, and has now turned into a mature and established technique. In spite of the fact that the lattice formulation of Quantum Field Theory has been applied to virtually all fundamental interactions, it is appropriate to discuss this topic in a chapter devoted to QCD, since by far the largest part of activity is focused on the strong interaction. Lattice QCD is, in fact, the only known method which allows ab initio investigations of hadronic properties, starting from the QCD Lagrangian formulated in terms of quarks and gluons.

Quantum Chromodynamics

2019 ◽  
pp. 169-186
Author(s):  
Michael E. Peskin
Keyword(s):  
Gauge Theory ◽  
Gauge Symmetry ◽  
Quantum Chromodynamics ◽  
Strong Interaction ◽  
Experimental Results ◽  
Asymptotic Freedom ◽  
Field Equations ◽  
Abelian Gauge

This chapter introduces non-Abelian gauge symmetry and the associated field equations for spin-1 particles. It proposes the gauge theory Quantum Chromodynamics as the theory of the strong interaction. It describes the property of asymptotic freedom, which explains a number of mysteries in the experimental results shown in the previous three chapters.

The eightfold way model, the SU(3)-flavor model and the medium–strong interaction

2015 ◽  
Vol 30 (12) ◽  
pp. 1550050
Author(s):  
Syed Afsar Abbas
Keyword(s):  
Quantum Chromodynamics ◽  
Lie Algebra ◽  
Strong Interaction ◽  
Baryon Number ◽  
Adjoint Representation ◽  
Macroscopic Models ◽  
Physical Representation ◽  
New Perspective ◽  
The Way

Lack of any baryon number in the eightfold way model, and its intrinsic presence in the SU(3)-flavor model, has been a puzzle since the genesis of these models in 1961–1964. First we show that the conventional popular understanding of this puzzle is actually fundamentally wrong, and hence the problem being so old, begs urgently for resolution. In this paper we show that the issue is linked to the way that the adjoint representation is defined mathematically for a Lie algebra, and how it manifests itself as a physical representation. This forces us to distinguish between the global and the local charges and between the microscopic and the macroscopic models. As a bonus, a consistent understanding of the hitherto mysterious medium–strong interaction is achieved. We also gain a new perspective on how confinement arises in quantum chromodynamics.

scholarly journals Empirical Consequences of Emergent Mass

Symmetry ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1468 ◽  
Author(s):  
Craig D. Roberts
Keyword(s):  
Standard Model ◽  
Quantum Chromodynamics ◽  
Strong Interaction ◽  
Effective Charge ◽  
Form Factors ◽  
Electromagnetic Form Factors ◽  
Parton Distributions ◽  
Atomic Nuclei ◽  
The Standard Model ◽  
High Level

The Lagrangian that defines quantum chromodynamics (QCD), the strong interaction piece of the Standard Model, appears very simple. Nevertheless, it is responsible for an astonishing array of high-level phenomena with enormous apparent complexity, e.g., the existence, number and structure of atomic nuclei. The source of all these things can be traced to emergent mass, which might itself be QCD’s self-stabilising mechanism. A background to this perspective is provided, presenting, inter alia, a discussion of the gluon mass and QCD’s process-independent effective charge and highlighting an array of observable expressions of emergent mass, ranging from its manifestations in pion parton distributions to those in nucleon electromagnetic form factors.

scholarly journals QUANTUM CHROMODYNAMICS AT COLLIDERS

2006 ◽  
Vol 21 (08n09) ◽  
pp. 1792-1804
Author(s):  
JON M. BUTTERWORTH
Keyword(s):  
Quantum Chromodynamics ◽  
Strong Interaction ◽  
Recent Progress ◽  
New Physics ◽  
Effective Theory ◽  
The Past ◽  
Interaction Studies ◽  
Electroweak Sector ◽  
Second Category

QCD is the accepted (that is, the effective) theory of the strong interaction; studies at colliders are no longer designed to establish this. Such studies can now be divided into two categories. The first involves the identification of observables which can be both measured and predicted at the level of a few percent. Such studies parallel those of the electroweak sector over the past fifteen years, and deviations from expectations would be a sign of new physics. These observables provide a firm "place to stand" from which to extend our understanding. This links to the second category of study, where one deliberately moves to regions in which the usual theoretical tools fail; here new approximations in QCD are developed to increase our portfolio of understood processes, and hence our sensitivity to new physics. Recent progress in both these aspects of QCD at colliders is discussed.

QCD AT COLLIDERS

2004 ◽  
Vol 19 (06) ◽  
pp. 864-876
Author(s):  
R. HIROSKY
Keyword(s):  
Quantum Chromodynamics ◽  
Cross Sections ◽  
Strong Interaction ◽  
Energy Flow ◽  
Particle Physics ◽  
Theoretical Calculations ◽  
Production Cross ◽  
Strong Interactions ◽  
Final States ◽  
Jet Production

The success of the theory of Quantum Chromodynamics (QCD) in describing processes controlled by the strong interaction is generally seen as a triumph of modern particle physics. This paper reviews recent QCD measurements using hadronic jet final states from the Fermilab Tevatron, DESY's HERA, and CERN's LEP colliders. Recent advancements in the measurements of jet production cross sections, events shapes, and energy flow, along with improved theoretical calculations, allow for new levels of precision in the study of the physics of strong interactions and point to areas in need of further refinement.

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