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순수물리이론 연구단
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Novel collider and dark matter phenomenology of a top-philic Z'

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Title
Novel collider and dark matter phenomenology of a top-philic Z'
Author(s)
Pter Cox; Anibal D. Medina; Tirtha Sankar Ray; Andrew Spray
Publication Date
2016-06
Journal
JOURNAL OF HIGH ENERGY PHYSICS, v.2016, no.6, pp.110 -
Publisher
SPRINGER
Abstract
We consider extending the Standard Model by including an additional Abelian gauge group broken at low energies under which the right-handed top quark is the only effectively charged Standard Model fermion. The associated gauge boson (Z) is then naturally top-philic and couples only to the rest of the SM particle content at loop-level or via kinetic mixing with the hypercharge gauge boson which is assumed to be small. Working at the effective theory level, we demonstrate that such a minimal extension allows for an improved fitting of the∼2σexcess observed intt¯hsearches at the LHC in a region of parameter space that satisfies existing collider constraints. We also present the reach of the LHC at 13 TeV in constraining the relevant region of parameter space. Additionally we show that within the same framework a suitably chosen fermion charged only under the exotic Abelian group can, in the region of parameter space preferred by thet¯thmeasurements, simultaneously explain the dark matter relic density and theγ-ray excess at the galactic center observed by the Fermi-LAT experiment. (c) The Authors.
URI
http://pr.ibs.re.kr/handle/8788114/3164
ISSN
1029-8479
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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