Quantum Chromodynamics (QCD) is the theory of strong interactions. It is formulated in terms of elementary fields (quarks and gluons), whose interactions obey the principles of a relativistic QFT, with a non-abelian gauge invariance SU(3).

QCD does not distinguish between quark flavours, onlycolourcharge of quarks matters. At high energy (E ≫binding energy of quarks within hadrons), ratio of σ(pp) total and σ(π+p) total depends on number of possible quark-quark combinations. Predict: Experiment: σ(πp) σ(pp) = 2 ×3 3 ×3 = 2 3 σ(πp) σ(pp) = 24 mb 38 mb ∼ 2 3 Prof ...

Abstract After describing the quark and parton models, we introduce QCD, explain factorization in perturbative QCD, and show how to derive evolution equations. We discuss violations of …

QCD --- Quantum Chromodynamics QCD Principles Quantum field theory, analogy with QED Vertex, coupling constant Colour “red”, “green” or “blue” Gluons Quark and Gluon Interactions Confinement Asymptotic Freedom QCD potential QCD Experiments Experimental evidence for quarks, colour and gluons e+e- annihilations Charmonium Scattering ...

• QCD confinement at low energy, hadronic bound states: pion, proton,… • Manifested by infrared divergences in perturbative calculation of bound-state properties • Asymptotic freedom at high energy leads to small coupling constant • Perturbative QCD for high-energy processes

the theory and phenomenology of quantum chromodynamics (QCD), focusing on collider physics applications. The aim is to bring the reader to a level where informed decisions can be made concerning different approaches and their uncertainties. The material is divided into five main areas: 1) fundamentals, 2) fixed-order perturbative QCD, 3 ...

These lectures present a heuristic introduction to gauge theories of electromagnetic and strong interactions, focusing on perturbative applications of the S matrix and the use of Feynman graphs in QED and QCD. They are complementary to the presentations of field theory in the Standard Model and Quantum Field Theory courses at this School.

• 格点qcd是与高能物理实验和理论 研究并列的第三分支。 • 格点qcd对强相互作用研究、标准 模型精确检验和新物理寻找等有十分 重要的理论意义。 • 中国的大科学装置bepcii/besiii的高能物理实验研究也急需格点qcd进 行理论配合研究。 夸克禁闭 渐进自由 9

QCD is a theory of the strong interactions, a fundamental force describing interactions of the color carrying quarks and gluons. ....................................................................................... The gluons are massless vector bosons; like the photon, they have spin of 1.

2012年7月10日 · The material is divided into five main areas: 1) fundamentals, 2) fixed-order perturbative QCD, 3) Monte Carlo event generators and parton showers, 4) Matching at Leading and Next-to-Leading Order, and 5) Soft QCD physics. Lecture notes …