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Move to UCLA and continuing concerns

JAGDISH MEHRA and KIMBALL A. MILTON

in Climbing the Mountain: The Scientific Biography of Julian Schwinger

Julian Schwinger left Harvard University in 1971 to move to the University of California at Los Angeles (UCLA), perhaps because he perceived that his source theory had received a chilly reception at ... More

Julian Schwinger left Harvard University in 1971 to move to the University of California at Los Angeles (UCLA), perhaps because he perceived that his source theory had received a chilly reception at Harvard, and thought (rather erroneously as it turned out) that UCLA, where he intended to go, would be more hospitable. Schwinger wished his audiences to rid themselves of all the machinery of operator quantum field theory that they had so laboriously acquired. Less comprehensible was the outright hostility expressed in many quarters. But probably at least as important for his relocation was the fact he had been at Harvard for 25 years, and felt the need for a change. This chapter looks at Schwinger's renewed interest in strong-field electrodynamics while at UCLA, the discovery of an extremely narrow spin-1 resonance coupling to the photon by researchers at the Stanford Linear Accelerator Center and at Brookhaven National Laboratory, Schwinger's two papers on renormalisation group without renormalisation group, deep inelastic scattering and Schwinger's reaction to partons and quarks, source theory and general relativity, magnetic charge and dyons, and supersymmetry.Less

The Development Of QCD

GÜNTHER DISSERTORI, IAN G. KNOWLES, and MICHAEL SCHMELLING

in Quantum Chromodynamics: High Energy Experiments and Theory

This chapter reviews and puts into context the experiments which lead to the formulation of QCD. Starting from the static quark model, the phenomenology of deep inelastic scattering processes is ... More

This chapter reviews and puts into context the experiments which lead to the formulation of QCD. Starting from the static quark model, the phenomenology of deep inelastic scattering processes is introduced and used to derive and explain the quark parton model (QPM). Discussing in detail the conceptual problems of the QPM, the arguments that lead to the theory of strong interactions based on an SU(3) gauge symmetry are explained. The chapter concludes with the lagrangian of QCD.Less

Deep Inelastic Electron Scattering

Michael E. Peskin

in Concepts of Elementary Particle Physics

This chapter describes the parton model of the inelastic scattering of electrons from protons, tests of this model, and the use of this model to understand the internal structure of the proton.

The Strong Interactions

J. Iliopoulos and T.N. Tomaras

in Elementary Particle Physics: The Standard Theory

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 ... More

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.Less