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Particle Physics in the LHC Era$
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Giles Barr, Robin Devenish, Roman Walczak, and Tony Weidberg

Print publication date: 2016

Print ISBN-13: 9780198748557

Published to Oxford Scholarship Online: March 2016

DOI: 10.1093/acprof:oso/9780198748557.001.0001

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The Higgs boson

The Higgs boson

(p.333) 12 The Higgs boson
Particle Physics in the LHC Era

G. Barr

R. Devenish

R. Walczak

T. Weidberg

Oxford University Press

This chapter starts with a simple introduction to gauge invariance and spontaneous symmetry breaking. An elementary introduction to Lagrangians in classical and quantum mechanics is given. A simplified description of the Higgs mechanism for electroweak symmetry breaking is presented in terms of Lagrangians. The experimental evidence for the observation of the Higgs boson is described in the two-photon, ZZ*, and WW* channels. There is an emphasis on understanding the Standard Model backgrounds and the required detector performance. The statistical techniques used to assess the significance of the results are described. The measurements used to determine the spin–parity of the Higgs boson are reviewed. The evidence for the Higgs boson decay to fermions is described using the two-tau decay mode. The outlook for future studies to determine if this Higgs boson is compatible with the Standard Model Higgs boson is discussed.

Keywords:   electroweak symmetry breaking, Higgs mechanism, spontaneous symmetry breaking, observation of Higgs boson, spin–parity of Higgs boson, Higgs boson decay to fermions

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