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

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Abstract

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.

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Authors and Affiliations

  1. Excellence Cluster Universe, Technische Universität München, D-85748, Garching, Germany

    S. Casagrande

  2. Institut für Physik (THEP), Johannes Gutenberg-Universität, D-55099, Mainz, Germany

    F. Goertz, U. Haisch, M. Neubert & T. Pfoh

  3. Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, D-69120, Heidelberg, Germany

    M. Neubert

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  1. S. Casagrande
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ArXiv ePrint: 1005.4315

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Casagrande, S., Goertz, F., Haisch, U. et al. The custodial Randall-Sundrum model: from precision tests to Higgs physics. J. High Energ. Phys. 2010, 14 (2010). https://doi.org/10.1007/JHEP09(2010)014

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