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Scattering Amplitudes in Quantum Field Theory

Module PH2316

This module handbook serves to describe contents, learning outcome, methods and examination type as well as linking to current dates for courses and module examination in the respective sections.

Basic Information

PH2316 is a semester module in English language at Master’s level which is offered in winter semester.

This Module is included in the following catalogues within the study programs in physics.

  • Specialization Modules in Elite-Master Program Theoretical and Mathematical Physics (TMP)

If not stated otherwise for export to a non-physics program the student workload is given in the following table.

Total workloadContact hoursCredits (ECTS)
150 h 45 h 5 CP

Responsible coordinator of the module PH2316 is Lorenzo Tancredi.

Content, Learning Outcome and Preconditions

Content

This course provides an introduction to modern methods in perturbative Quantum Field Theory, which find their primary application in high-energy physics

- Representations of the Lorentz and Poincare group, little group and spinor representations

- Spinor helicity formalism for Scattering Amplitudes

- Tree-Level amplitudes, color decomposition and primitive amplitudes, recursion techniques

- Loop amplitudes and treatment of UV and IR divergences in dimensional regularization

- Optical theorem, dispersion relations and the analytic structure of scattering amplitudes

- Generalized unitarity for one-loop scattering amplitudes

- Modern multiloop techniques (Direct Integration techniques, Integration by Parts identities, Differential Equations)

- Special Functions (classical polylogarithms, multiple polylogarithms and the symbol map, generalizations)

Learning Outcome

After successful completion of the module the students understand modern ideas and methods in the theory of Scattering Amplitudes in perturbative Quantum Field Theory. In particular, the students:

  1. Can use the spinor helicity formalism and recursive methods for tree-level amplitudes in Yang-Mills theories.
  2. Understand the origin of IR and UV divergences in scattering amplitudes
  3. Can decompose scattering amplitudes in independent master integrals and understand their analytic properties
  4. Know how to compute one-loop Feynman integrals in dimensional regularization by direct integration
  5. Can apply integration by parts identities and differential equations to Feynman integrals
  6. Have an understanding of the basic properties of iterated integrals and in particular of polylogarithms

Preconditions

Very good knowledge of Advanced Quantum Mechanics and Special Relativity are essential.

A knowledge of Quantum Field Theory as provided in PH2040 (Relativity, Particles and Fields) and PH1008 (Quantum Field Theory) would be desirable. In particular, familiarity with Scalar, QED and Yang Mills Feynman rules will be assumed for some parts of the course.

Very motivated students can profit from this class by attending it in parallel with PH1008.

Courses, Learning and Teaching Methods and Literature

Courses and Schedule

Learning and Teaching Methods

Blackboard lectures and weekly exercises

Media

Blackboard lectures, possibly (but not necessarily) accompanied by slides

Literature

- Quantum Field Theory and the Standard Model, M. Schwartz

- Scattering Amplitudes in Gauge Theory and Gravity, H. Elvang and Y.T. Huang

- Scattering Amplitudes in Gauge Theories, J. Henn and J. Plefka

- Calculating Scattering Amplitudes Efficiently, L. Dixon https://arxiv.org/abs/hep-ph/9601359

Module Exam

Description of exams and course work

no info

Exam Repetition

The exam may be repeated at the end of the semester.

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