Pseudoscalar portal dark matter and new signatures of vector-like fermions

Journal Article · Tue Jan 19 00:00:00 EST 2016 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP01(2016)111· OSTI ID:1327313

Fan, JiJi ^[1]; Koushiappas, Savvas M. ^[1]; Landsberg, Greg ^[1]

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1. Brown Univ., Providence, RI (United States)

Fermionic dark matter interacting with the Standard Model sector through a pseudoscalar portal could evade the direct detection constraints while preserving a WIMP miracle. Here, we study the LHC constraints on the pseudoscalar production in simplified models with the pseudoscalar either dominantly coupled to b quarks or $${{\tau}}$$ leptons and explore their implications for the GeV excesses in gamma ray observations. We also investigate models with new vector-like fermions that could realize the simplfied models of pseudoscalar portal dark matter. Furthermore, these models yield new decay channels and signatures of vector-like fermions, for instance, bbb; b$${{\tau}}$$ $${{\tau}}$$, and $${{\tau}}$$ $${{\tau}}$$ $${{\tau}}$$ resonances. Some of the signatures have already been strongly constrained by the existing LHC searches and the parameter space fitting the gamma ray excess is further restricted. Conversely, the pure $${{\tau}}$$-rich final state is only weakly constrained so far due to the small electroweak production rate.

• Research Organization: Brown Univ., Providence, RI (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: SC0010010
• OSTI ID: 1327313
• Journal Information: Journal of High Energy Physics (Online), Vol. 2016, Issue 1; ISSN 1029-8479
• Publisher: Springer Berlin
• Country of Publication: United States
• Language: English

Related Subjects

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