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

Journal article

We reexamine the Randall-Sundrum (RS) model with enlarged gauge symmetry SU(2) 1 × 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. © SISSA 2010.

Authors: Casagrande, S; Goertz, F; Haisch, U; Neubert, M; Pfoh, T

• Publication status: Published
• Journal: JOURNAL OF HIGH ENERGY PHYSICS
• Volume: 2010
• Issue: 9
• Publication date: 2010-09-01
• DOI: 10.1007/JHEP09(2010)014
• EISSN: 1029-8479
• ISSN: 1126-6708
• Language: English
• Keywords: Higgs Physics; Field Theories in Higher Dimensions