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Higgs production and decay in models of a warped extra dimension with a bulk Higgs

By Germany Mainz 55099 Johannes Gutenberg University PaulPRISMA Cluster of Excellence & Mainz Institute for Theoretical Physics Archer, U.S.A.) 60510 IL Batavia Fermilab Marcela(Theoretical Physics Department Carena, Switzerland) Zürich 8093 ETH Zürich Adrian(Institut für Theoretische Physik Carmona and Germany) Mainz 55099 Johannes Gutenberg University Matthias(PRISMA Cluster of Excellence & Mainz Institute for Theoretical Physics Neubert

Abstract

Warped extra-dimension models in which the Higgs boson is allowed to propagate in the bulk of a compact AdS 5 space are conjectured to be dual to models featuring a partially composite Higgs boson. They offer a framework with which to investigate the implications of changing the scaling dimension of the Higgs operator, which can be used to reduce the constraints from electroweak precision data. In the context of such models, we calculate the cross section for Higgs production in gluon fusion and the H → γγ decay rate and show that they are finite (at one-loop order) as a consequence of gauge invariance. The extended scalar sector comprising the Kaluza-Klein excitations of the Standard Model scalars is constructed in detail. The largest effects are due to virtual KK fermions, whose contributions to the cross section and decay rate introduce a quadratic sensitivity to the maximum allowed value y ∗ of the random complex entries of the 5D anarchic Yukawa matrices. We find an enhancement of the gluon-fusion cross section and a reduction of the H →γγ rate as well as of the tree-level Higgs couplings to fermions and electroweak gauge bosons. We perform a detailed study of the correlated signal strengths for different production mechanisms and decay channels as functions of y ∗ , the mass scale of Kaluza-Klein resonances and the scaling dimension of the composite Higgs operator

Year: 2015
DOI identifier: 10.1007/JHEP01(2015)060
OAI identifier: oai:www.openaccessrepository.it:10667

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