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Durham University

Centre for Particle Theory

Higgs Phenomenology

8 Lectures Prof. K. Ellis

The aim of the course is to introduce the ideas and concepts associated with the phenomenology of the electroweak symmetry breaking post Higgs discovery, building on the foundations given in the Standard Model course. The course starts with a detailed pedagogical introduction to electroweak symmetry breaking in the Standard Model, including gauge boson and fermion mass generation and the resulting predictions for Higgs boson interactions. The theoretical constraints on the Higgs sector coming from unitarity, and ideas of triviality, vacuum stability and fine tuning will be reviewed.
We then survey Higgs boson decays and production mechanisms at hadron colliders. The dominant production mechanism is gluon fusion and we will study this in depth, building on the foundations of the QCD course.
We finish with a discussion of Naturalness to motivate Higgs physics beyond the Standard Model. We will study two different types of extension - an effective theory that introduces the effects of new physics at high scales through higher dimensional operators, and a model with an additional Higgs-doublet (which is the foundation of the Minimal Supersymmetric Standard Model).

Outline of the course

Higgs Sector of the Standard Model
Theoretical Constraints on the Higgs Sector: Equivalence Theorem, Unitarity, Triviality, Vacuum Stability, Electroweak Precision Observables, Fine Tuning
Higgs Decays
Higgs Production: Gluon Fusion (Gluon Fusion at LO, Low Energy Effective Theorem, Gluon Fusion at NLO), Vector Boson Fusion
Beyond the Standard Model Higgs: Naturalness, Higgs Boson Effective Theory, Two Higgs Doublet Model

Books and articles for the course

H. E. Logan, TASI 2013: lectures on Higgs physics within and beyond the Standard Model, arXiv:1406.1786 [hep-ph]
L. Reina,TASI 2011: lectures on Higgs-Boson Physics, arXiv:1208.5504 [hep-ph].
S. Dittmaier et al.[LHCHXSWG], Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables, arXiv:1101.0593 [hep-ph].
S. Dittmaier,et al.[LHCHXSWG], Handbook of LHC Higgs Cross Sections: 2. Differential Distributions, arXiv:1201.3084 [hep-ph].
S. Heinemeyer et al.[LHCHXSWG], Handbook of LHC Higgs Cross Sections: 3. Higgs Properties, arXiv:1307.1347 [hep-ph].