from 28 June 2015 to 3 July 2015 (Africa/Johannesburg)
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SAIP2015 Proceeding published on 17 July 2016
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Exploring the Dark Sector extension to the Standard Model via the Higgs Portal

Presented by Prof. Simon CONNELL on 2 Jul 2015 from 11:10 to 11:30
Type: Oral Presentation
Session: NPRP
Track: Track B - Nuclear, Particle and Radiation Physics


The Standard Model (SM) is known to be incomplete. The introduction of a Dark Sector via an additional U(1)<sub>d</sub> gauge symmetry added to the SM Lagrangian provides a mechanism to introduce much needed new physics without perturbing the already excellent agreement between the SM theoretical description and the Electroweak Precision Observables (EWPO) experimental constraints. The model has a dark vector boson Z<sub>d</sub> which can mix with the hypercharge gauge boson with the coupling &epsilon;. This opens the Hypercharge Portal which can mediate the fluctuation of a Z to a Z<sub>d</sub>, or the decay of the Z<sub>d</sub> to SM leptons. If a dark Higgs singlet s also exists, this then breaks the U(1)<sub>d</sub>, opening the Higgs portal and also allowing for Higgs mass mixing between the SM and dark sectors, described by the Higgs mass mixing parameter, &kappa;. Including dark fermionic fields in the Lagrangian allows for long-lived cold Dark Matter candidates. The various connections between the Dark and SM sectors allow descriptions of many key astro-physical phenomena. The Model is therefore a fascinating candidate for new physics beyond the SM. It becomes crucial to search for experimental signatures of this model. A promising avenue is to exploit the production of the dark force boson Z<sub>d</sub> via the Higgs Portal and the search for its decay back to SM leptons: H → h<sub>d</sub>→ Z<sub>d</sub>Z<sub>d</sub> → 4l. The detailed design and results of this search are presented.









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