Monotop signature from a fermionic top partner

Journal Article · 08 January 2018 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.97.015002 · OSTI ID:1416060

Gonçalves, Dorival ^[1]; Kong, Kyoungchul ^[2]; Sakurai, Kazuki ^[3]; Takeuchi, Michihisa ^[4]

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1. Univ. of Pittsburgh, PA (United States). PITT PACC. Dept. of Physics and Astronomy
2. Univ. of Kansas, Lawrence, KS (United States). Dept. of Physics and Astronomy
3. Univ. of Warsaw (Poland). Inst. of Theoretical Physics. Faculty of Physics
4. Univ. of Tokyo, Kashiwa (Japan). Kavli IPMU (WPI). UTIAS

We investigate monotop signatures arising from phenomenological models of fermionic top partners, which are degenerate in mass and decay into a bosonic dark matter candidate, either spin 0 or spin 1. Such a model provides a monotop signature as a smoking gun, while conventional searches with $$t\overline{t}+$$ missing transverse momentum are limited. Two such scenarios, (i) a phenomenological third generation extradimensional model with excited top and electroweak sectors, and (ii) a model where only a top partner and a dark matter particle are added to the standard model, are studied in the degenerate mass regime. We find that in the case of extra dimension a number of different processes give rise to effectively the same monotop final state, and a great gain can be obtained in the sensitivity for this channel. We show that the monotop search can explore top-partner masses up to 630 and 300 GeV for the third generation extradimensional model and the minimal fermionic top-partner model, respectively, at the high luminosity LHC.

• Research Organization: Univ. of Kansas, Lawrence, KS (United States); Univ. of Pittsburgh, PA (United States); Univ. of Warsaw (Poland); Univ. of Tokyo, Kashiwa (Japan)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); Univ. of Kansas (United States); National Science Foundation (NSF); German Research Foundation (DFG); National Science Centre (Poland); Japan Society for the Promotion of Science (JSPS)
• Grant/Contract Number: SC0017965; 2151081; PHY-1519175; SFB1258; DEC-2014/15/B/ST2/02157; DEC-2015/18/M/ST2/00054; 2015/19/D/ST2/03136; JP16H03991; JP16H02176; 17H05399
• OSTI ID: 1416060
• Alternate ID(s): OSTI ID: 1503838
• Journal Information: Physical Review. D., Vol. 97, Issue 1; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English