nLab
QCD

Contents

under construction

Context

Physics

physics, mathematical physics, philosophy of physics

Surveys, textbooks and lecture notes


theory (physics), model (physics)

experiment, measurement, computable physics

Algebraic Qunantum Field Theory

algebraic quantum field theory (perturbative, on curved spacetimes, homotopical)

Introduction

Concepts

field theory:

Lagrangian field theory

quantization

quantum mechanical system, quantum probability

free field quantization

gauge theories

interacting field quantization

renormalization

Theorems

States and observables

Operator algebra

Local QFT

Perturbative QFT

Contents

Idea

Quantum chromodynamics (“QCD”) is the quantum field theory of Yang-Mills theory: it describes the quantum theory of gluons and quarks.

The corresponding effective field theory that describes bound states such as protons is quantum hadrodynamics.

Properties

Confinements

See at confinement.

Asymptotic freedom

See at asymptotic freedom.

Phase diagram

QCD has an intricate phase diagram (e.g. Hands 01, Schaefer 05) including

References

General

Introductions include

  • Peter Skands, Introduction to QCD (arXiv:1207.2389)

  • Y. Kurihara, QCD at LHC for beginners Lesson 1 (pdf), Lesson 2 (pdf) Lesson 3 (pdf)

  • Particle Data Group, Quantum Chromodynamics (pdf)

Textbook account with phenomenological emphasis:

Rigorous construction as a perturbative quantum field theory via causal perturbation theory is discussed in

Discussion of on-shell methods in QCD perturbation theory includes

See also

  • Bo-Lun Du, Xing-Gang Wu, Jian-Ming Shen, Stanley J. Brodsky, Extending the Predictive Power of Perturbative QCD (arXiv:1807.11144)

Phase diagram

On the phase diagram of QCD

History

Lattice QCD checks

Due to confinement, the fundamental degrees of freedom in terms of which QCD is formulated, namely the quarks, are actually not the low-energy bound states of the theory, which instead are the hadrons. This leaves room to speculate that QCD is not really the fundamental theory of the strong nuclear force.

However, brute-force computation in lattice QCD shows that the quark-model does reproduce these hadron bound states somehow (even if the real understanding of how it does so remains open, this is the mass gap problem):

  • S. Durr, Z. Fodor, J. Frison, C. Hoelbling, R. Hoffmann, S.D. Katz, S. Krieg, T. Kurth, L. Lellouch, T. Lippert, K.K. Szabo, G. Vulvert,

    Ab-initio Determination of Light Hadron Masses,

    Science 322:1224-1227,2008 (arXiv:0906.3599)

    conclusion on p. 4:

our study strongly suggests that QCD is the theory of the strong interaction, at low energies as well

  • Zoltan Fodor, Christian Hoelbling, Light Hadron Masses from Lattice QCD, Rev. Mod. Phys. 84, 449, (arXiv:1203.4789)

  • S. Aoki et. al. Review of lattice results concerning low-energy particle physics (arXiv:1607.00299)

Last revised on July 9, 2019 at 09:07:41. See the history of this page for a list of all contributions to it.