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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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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (www.oxfordscholarship.com). (c) Copyright Oxford University Press, 2019. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 17 October 2019

The Higgs boson

The Higgs boson

Chapter:
(p.333) 12 The Higgs boson
Source:
Particle Physics in the LHC Era
Author(s):

G. Barr

R. Devenish

R. Walczak

T. Weidberg

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198748557.003.0012

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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