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Title: Nonminimal dark sectors: Mediator-induced decay chains and multijet collider signatures

Journal Article · · Physical Review. D.

A preponderance of astrophysical and cosmological evidence indicates that the universe contains not only visible matter but also dark matter. In order to suppress the couplings between the dark and visible sectors, a standard assumption is that these two sectors communicate only through a mediator. In this paper we make a simple but important observation: if the dark sector contains multiple components with similar quantum numbers, then this mediator also generically gives rise to dark-sector decays, with heavier dark components decaying to lighter components. This in turn can even give rise to relatively long dark decay chains, with each step of the decay chain also producing visible matter. The visible byproducts of such mediator-induced decay chains can therefore serve as a unique signature of such scenarios. In order to investigate this possibility more concretely, we examine a scenario in which a multicomponent dark sector is connected through a mediator to Standard-Model quarks. We then demonstrate that such a scenario gives rise to multijet collider signatures, and we examine the properties of such jets at both the parton and detector levels. Within relatively large regions of parameter space, we find that such multijet signatures are not excluded by existing monojet and multijet searches. Such decay cascades therefore represent a potential discovery route for multicomponent dark sectors at current and future colliders.

Research Organization:
Univ. of Arizona, Tucson, AZ (United States); Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
FG02-13ER41976; SC0009913; SC0010813; PHY-1720430; PHY-1607611
OSTI ID:
1615067
Alternate ID(s):
OSTI ID: 1801916
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Vol. 101 Journal Issue: 7; ISSN 2470-0010
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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