The custodial Randall-Sundrum model: from precision tests to Higgs physics

We reexamine the Randall-Sundrum (RS) model with enlarged gauge symmetry SU (2) L × SU (2) R × U (1) X × P LR in the presence of a brane-localized Higgs sector. In contrast to the existing literature, we perform the Kaluza-Klein (KK) decomposition within the mass basis, which avoids the truncation o...

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Bibliographic Details
Published inThe journal of high energy physics Vol. 2010; no. 9
Main Authors Casagrande, S., Goertz, F., Haisch, U., Neubert, M., Pfoh, T.
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer-Verlag 01.09.2010
Springer Nature B.V
Subjects
Broken symmetry
Classical and Quantum Gravitation
Couplings
Elementary Particles
Energy spectra
Fermions
Higgs bosons
High energy physics
Large Hadron Collider
Model testing
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Relativity Theory
String Theory
Higgs Physics
Field Theories in Higher Dimensions
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Summary:We reexamine the Randall-Sundrum (RS) model with enlarged gauge symmetry SU (2) L × SU (2) R × U (1) X × P LR in the presence of a brane-localized Higgs sector. In contrast to the existing literature, we perform the Kaluza-Klein (KK) decomposition within the mass basis, which avoids the truncation of the KK towers. Expanding the low-energy spectrum as well as the gauge couplings in powers of the Higgs vacuum expectation value, we obtain analytic formulas which allow for a deep understanding of the model-specific protection mechanisms of the T parameter and the left-handed Z -boson couplings. In particular, in the latter case we explain which contributions escape protection and identify them with the irreducible sources of P LR symmetry breaking. We furthermore show explicitly that no protection mechanism is present in the charged-current sector confirming existing model-independent findings. The main focus of the phenomenological part of our work is a detailed discussion of Higgs-boson couplings and their impact on physics at the CERN Large Hadron Collider. For the first time, a complete one-loop calculation of all relevant Higgs-boson production and decay channels is presented, incorporating the effects stemming from the extended electroweak gauge-boson and fermion sectors.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP09(2010)014