Quantum chromodynamics and phenomenology of strong interactions

2006 ◽  
Vol 176 (3) ◽  
pp. 275 ◽  
Author(s):  
Igor M. Dremin ◽  
A.B. Kaidalov
Keyword(s):  
Quantum Chromodynamics ◽  
Strong Interactions

LATTICE QCD CURRENT STATUS AND GOALS AT ONE TERAFLOPS

1994 ◽  
Vol 05 (02) ◽  
pp. 195-200
Author(s):  
CARLETON DeTAR
Keyword(s):  
Numerical Simulations ◽  
Quantum Chromodynamics ◽  
Lattice Qcd ◽  
Recent Progress ◽  
Current Status ◽  
Strong Interactions ◽  
Significant Progress ◽  
The Past

Through numerical simulations over the past decade we have made significant progress toward solving quantum chromodynamics (QCD), the widely accepted theory of the strong interactions. Quantitatively respectable results are beginning to emerge. We are also gaining new qualitative insights into the workings of the theory that will assist in the design and analysis of experiment. I give a few examples of recent progress in lattice QCD and discuss goals and prospects for computations using the coming generation of teraflops-scale supercomputers.

scholarly journals QCD beyond diagrams

2021 ◽  
Vol 36 (21) ◽  
pp. 2130012
Author(s):  
Michael Creutz
Keyword(s):  
Perturbation Theory ◽  
Symmetry Breaking ◽  
Quantum Chromodynamics ◽  
Chiral Symmetry ◽  
Chiral Symmetry Breaking ◽  
Strong Interactions ◽  
Quark Confinement ◽  
Mass Generation ◽  
Diagrammatic Perturbation Theory

Quantum chromodynamics (QCD), the theory of the strong interactions, involves quarks interacting with non-Abelian gluon fields. This theory has many features that are difficult to impossible to see in conventional diagrammatic perturbation theory. This includes quark confinement, mass generation and chiral symmetry breaking. This paper is a colloquium level overview of the framework for understanding how these effects come about.

scholarly journals Parity-odd parton distribution functions from 𝜃-vacuum

2019 ◽  
Vol 34 (26) ◽  
pp. 1950145 ◽  
Author(s):  
Weihua Yang
Keyword(s):  
Quantum Chromodynamics ◽  
Parton Distribution ◽  
Vacuum State ◽  
High Energy ◽  
Distribution Functions ◽  
Point Of View ◽  
Strong Interactions ◽  
Parton Distribution Functions ◽  
Linear Superposition ◽  
Abelian Gauge

Quantum chromodynamics is a fundamental non-Abelian gauge theory of strong interactions. The physical quantum chromodynamics vacuum state is a linear superposition of the [Formula: see text]-vacua states with different topological numbers. Because of the configuration of the gauge fields, the tunneling events can induce the local parity-odd domains. Those interactions that occur in these domains can be affected by these effects. Considering the hadron (nucleon) system, we introduce the parity-odd parton distribution functions in order to describe the parity-odd structures inside the hadron in this paper. We obtain 8 parity-odd parton distribution functions at leading twist for spin-1/2 hadrons and present their properties. By introducing the parity-odd quark–quark correlator, we find the parity-odd effects vanish from the macroscopic point of view. In this paper, we consider the high energy semi-inclusive deeply inelastic scattering process to investigate parity-odd effects by calculating the spin asymmetries.

PSEUDOSPIN SYMMETRY IN NUCLEI AS A RELATIVISTIC SYMMETRY

2006 ◽  
Vol 15 (08) ◽  
pp. 1843-1854
Author(s):  
JOSEPH N. GINOCCHIO
Keyword(s):  
Quantum Chromodynamics ◽  
Magnetic Dipole ◽  
Pseudospin Symmetry ◽  
Spin Symmetry ◽  
Strong Interactions ◽  
Relativistic Symmetry ◽  
Mean Fields ◽  
Nuclear Environment ◽  
Theoretical Evidence ◽  
Gamow Teller

We review some of the empirical and theoretical evidence supporting pseudospin symmetry in nuclei as a relativistic symmetry. We show that the eigenfunctions of realistic relativistic nuclear mean fields approximately conserve pseudospin symmetry. We discuss the implications of pseudospin symmetry for magnetic dipole transitions and Gamow-Teller transitions between states in pseudospin doublets. We explore a more fundamental rationale for pseudospin symmetry in terms of quantum chromodynamics (QCD), the basic theory of the strong interactions. We show that pseudospin symmetry in nuclei implies spin symmetry for an anti-nucleon in a nuclear environment.

QUANTUM CHROMODYNAMICS AT HIGH ENERGIES AT HERA

2005 ◽  
Vol 20 (22) ◽  
pp. 5202-5213
Author(s):  
MAX KLEIN
Keyword(s):  
Quantum Chromodynamics ◽  
Strong Interactions ◽  
Inelastic Electron ◽  
Proton Scattering ◽  
Coupling Constant ◽  
Fixed Target ◽  
High Energies ◽  
Diffractive Scattering ◽  
New Ideas ◽  
Energy Frontier

HERA is the world's only accelerator to study inelastic electron-proton scattering at the energy frontier which uniquely allows the partonic structure of the proton and the theory of strong interactions, QCD, to be deeply explored. A review is given here of recent results from the HERA ep collider experiments H1 and ZEUS and the fixed target eN spin experiment HERMES as was presented to the 32nd Rochester conference at Beijing in summer 2004. The summary comprises new results on the quark and gluon structure of the proton, on the strong coupling constant αs, on the production of charm and beauty particles and on hard diffractive scattering. New ideas and developments in HERA physics are presented as are the first measurements with the upgraded polarised ep collider.

The Strong Interactions

2021 ◽  
pp. 422-441
Author(s):  
J. Iliopoulos ◽  
T.N. Tomaras
Keyword(s):  
Perturbation Theory ◽  
Gauge Theory ◽  
Numerical Simulations ◽  
Quantum Chromodynamics ◽  
Strong Interactions ◽  
Strong Coupling Regime ◽  
Inelastic Electron ◽  
Nucleon Scattering ◽  
Fundamental Level ◽  
Series Of Experiments

For many years strong interactions had a well-deserved reputation for complexity. Their apparent strength rendered perturbation theory inapplicable. However, in the late 1960s a series of experiments studying the deep inelastic electron–nucleon scattering showed that at a more fundamental level, the strong interactions among the constituent quarks can be described perturbatively by an asymptotically free gauge theory. We present the theory of quantum chromodynamics, the unbroken gauge theory of the colour SU(3) group. We show how we can compute its predictions in the kinematic regions in which perturbation theory is applicable, but also in the strong coupling regime through numerical simulations on a space-time lattice.

Quantum chromodynamics: A non-Abelian gauge theory

2019 ◽  
pp. 209-236
Author(s):  
Jean Zinn-Justin
Keyword(s):  
Quantum Chromodynamics ◽  
Particle Physics ◽  
Gauge Theories ◽  
Brst Symmetry ◽  
Parallel Transport ◽  
Strong Interactions ◽  
Asymptotic Freedom ◽  
Abelian Gauge ◽  
Lattice Gauge ◽  
Colour Group

Chapter 13 is devoted to some aspects of quantum chromodynamics (QCD), the part of the Standard Model of particle physics responsible for strong interactions and based on an SU(3) gauge symmetry (the colour group) and gluon gauge fields. First, the geometry of non–Abelian gauge theories, based on parallel transport, is recalled. This leads naturally to the construction of lattice gauge theories with link variables and a plaquette action. The lattice model gives a hint of confinement. QCD is quantized in the temporal of Weyl gauge. Its renormalization involves the BRST symmetry. Its renormalization group properties with asymptotic freedom are emphasized. The infinite degeneracy of the semi–classical ground state can be associated to a winding number. Barrier penetration effects, related to the existence of instantons, lead to the existence of theta vacua and the problem of strong CP violation. Other issues considered are chiral symmetry and axial anomaly.

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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