Dark matter and collider signals in an MSSM extension with vector-like multiplets

Araz, Jack Y.; Banerjee, Shankha; Frank, Mariana; Fuks, Benjamin; Goudelis, Andreas

Abstract

Motivated by grand unification considerations, we analyse a simple extension of the minimal supersymmetric standard model with additional pairs of vector-like chiral supermultiplets. We focus on the so-called LND setup, which enlarges the particle content of the minimal model by two vector-like pairs of weak doublets (one pair of leptons and one pair of down-type quarks) and one vector-like pair of neutrino singlets. Imposing collider and low-energy constraints, sneutrinos and neutralinos both emerge as possible lightest supersymmetric particles and thus dark matter candidates. We perform a complete analysis of the dark sector and study the viability of these neutralino and sneutrino dark matter options. We show that cosmological considerations (the dark matter relic abundance and its direct and indirect detection signals) restrict neutralino dark matter to exhibit similar properties as in the minimal supersymmetric standard model, and impose the sneutrino dark matter candidate to be singlet-like, rather than doublet-like. Allowing the mixing of the fermionic component of the new supermultiplets with the Standard Model third generation fermions, we moreover demonstrate the existence of collider signals that are distinguishable from other, more minimal, supersymmetric scenarios by virtue of an enhanced production of events enriched in tau leptons. We furthermore show that this signature yields robust LHC signals, that could potentially be differentiated from the background in future data.

Citation

Araz, J. Y., Banerjee, S., Frank, M., Fuks, B., & Goudelis, A. (2018). Dark matter and collider signals in an MSSM extension with vector-like multiplets. Physical Review D, 98(11), Article 115009. https://doi.org/10.1103/physrevd.98.115009

• Journal Article Type: Article
• Online Publication Date: Dec 5, 2018
• Publication Date: Dec 5, 2018
• Deposit Date: Jan 4, 2019
• Publicly Available Date: Jan 4, 2019
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 98
• Issue: 11
• Article Number: 115009
• DOI: https://doi.org/10.1103/physrevd.98.115009
• Public URL: https://durham-repository.worktribe.com/output/1306135