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Title: Monotop signature from a fermionic top partner

Abstract

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.

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Kansas, Lawrence, KS (United States); Univ. of Pittsburgh, PA (United States); Univ. of Warsaw (Poland); Univ. of Tokyo, Kashiwa (Japan)
Sponsoring Org.:
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)
OSTI Identifier:
1416060
Alternate Identifier(s):
OSTI ID: 1503838
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
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 97 Journal Issue: 1; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 43 PARTICLE ACCELERATORS; extensions of fermion sector; hierarchy problem; higher-dimensional field theories; particle interactions; particle production; weakly interacting massive particles; Hadron colliders; particle accelerators

Citation Formats

Gonçalves, Dorival, Kong, Kyoungchul, Sakurai, Kazuki, and Takeuchi, Michihisa. Monotop signature from a fermionic top partner. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.97.015002.
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Gonçalves, Dorival, Kong, Kyoungchul, Sakurai, Kazuki, & Takeuchi, Michihisa. Monotop signature from a fermionic top partner. United States. https://doi.org/10.1103/PhysRevD.97.015002
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Gonçalves, Dorival, Kong, Kyoungchul, Sakurai, Kazuki, and Takeuchi, Michihisa. Mon . "Monotop signature from a fermionic top partner". United States. https://doi.org/10.1103/PhysRevD.97.015002.
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@article{osti_1416060,
title = {Monotop signature from a fermionic top partner},
author = {Gonçalves, Dorival and Kong, Kyoungchul and Sakurai, Kazuki and Takeuchi, Michihisa},
abstractNote = {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.},
doi = {10.1103/PhysRevD.97.015002},
journal = {Physical Review D},
number = 1,
volume = 97,
place = {United States},
year = {2018},
month = {1}
}
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Journal Article:
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https://doi.org/10.1103/PhysRevD.97.015002
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Figures / Tables:

FIG. 1 FIG. 1: Representative set of Feynman diagrams resulting in the monotop signature in the third generation extradimensional model.
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