Dark decay of the top quark

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We suggest top quark decays as a venue to search for light dark force carriers. The top quark is the heaviest particle in the standard model whose decays are relatively poorly measured, allowing sufficient room for exotic decay modes from new physics. A very light (GeV scale) dark gauge boson (Z') is a recently highlighted hypothetical particle that can address some astrophysical anomalies as well as the 3.6 sigma deviation in the muon g - 2 measurement. We present and study a possible scenario that top quark decays as t -> bW + Z's. This is the same as the dominant top quark decay (t -> bW) accompanied by one or multiple dark force carriers. The Z' can be easily boosted, and it can decay into highly collimated leptons (lepton-jet) with large branching ratio. We discuss the implications for the Large Hadron Collider experiments including the analysis based on the lepton-jets.
Publisher
AMER PHYSICAL SOC
Issue Date
2014-04
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW D, v.89, no.7

ISSN
2470-0010
DOI
10.1103/PhysRevD.89.074007
URI
http://hdl.handle.net/10203/226482
Appears in Collection
PH-Journal Papers(저널논문)
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