title: Higgs decay into two photons in a warped extra dimension.
abstract: A detailed five-dimensional calculation of the Higgs-boson decay into two photons is performed in both the minimal and the custodially protected Randall-Sundrum (RS) model, where the Standard Model (SM) fields propagate in the bulk and the scalar sector lives on or near the IR brane. It is explicitly shown that the [Formula: see text] gauge invariance of the sum of diagrams involving bosonic fields in the SM also applies to the case of these RS scenarios. An exact expression for the [Formula: see text] amplitude in terms of the five-dimensional (5D) gauge-boson and fermion propagators is presented, which includes the full dependence on the Higgs-boson mass. Closed expressions for the 5D [Formula: see text]-boson propagators in the minimal and the custodial RS model are derived, which are valid to all orders in [Formula: see text]. In contrast to the fermion case, the result for the bosonic contributions to the [Formula: see text] amplitude is insensitive to the details of the localization of the Higgs profile on or near the IR brane. The various RS predictions for the rate of the [Formula: see text] process are compared with the latest LHC data, and exclusion regions for the RS model parameters are derived.
authors.affiliation: PRISMA Cluster of Excellence and Mainz Institute for Theoretical Physics, Johannes Gutenberg University, 55099  Mainz, Germany.
authors.forename: Juliane
authors.initials: J
authors.lastname: Hahn
authors.affiliation: PRISMA Cluster of Excellence and Mainz Institute for Theoretical Physics, Johannes Gutenberg University, 55099  Mainz, Germany.
authors.forename: Clara
authors.initials: C
authors.lastname: Hörner
authors.affiliation: PRISMA Cluster of Excellence and Mainz Institute for Theoretical Physics, Johannes Gutenberg University, 55099  Mainz, Germany.
authors.forename: Raoul
authors.initials: R
authors.lastname: Malm
authors.affiliation: PRISMA Cluster of Excellence and Mainz Institute for Theoretical Physics, Johannes Gutenberg University, 55099  Mainz, Germany ; Department of Physics, LEPP, Cornell University, Ithaca, NY 14853 USA.
authors.forename: Matthias
authors.initials: M
authors.lastname: Neubert
authors.affiliation: PRISMA Cluster of Excellence and Mainz Institute for Theoretical Physics, Johannes Gutenberg University, 55099  Mainz, Germany.
authors.forename: Kristiane
authors.initials: K
authors.lastname: Novotny
authors.affiliation: PRISMA Cluster of Excellence and Mainz Institute for Theoretical Physics, Johannes Gutenberg University, 55099  Mainz, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Schmell
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