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Title: Loop induced single top partner production and decay at the LHC

Abstract

Most searches for top partners, T , are concerned with top partner pair production. However, as these bounds become increasingly stringent, the LHC energy will saturate and single top partner production will become more important. In this paper we study the novel signature of the top partner produced in association with the SM top, p p → T t ¯ + t T ¯ , in a model where the Standard Model (SM) is extended by a vector-like SU(2)L singlet fermion top partner and a real, SM gauge singlet scalar, S. In this model, p p → T t ¯ + t T ¯ production is possible through loops mediated by the scalar singlet. We find that, with reasonable coupling strengths, the production rate of this channel can dominate top partner pair production at top partner masses of mT ≳ 1.5 TeV. In addition, this model allows for the exotic decay modes T → tg, T → tγ, and T → tS. In much of the parameter space the loop induced decay T → tg dominates and the top partner is quite long lived. New search strategies are necessary to cover these decay modes. We project the the sensitivity of the high luminosity LHC to p p → T t ¯ + t T ¯ via a realistic collider study. We find with 3 ab-1, the LHC is sensitive to this process for masses mT ≲ 2 TeV. In addition, we provide appendices detailing the renormalization of this model.

Authors:
 [1];  [1]
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  1. Univ. of Kansas, Lawrence, KS (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Univ. of Kansas, Lawrence, KS (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1512400
Grant/Contract Number:  
SC0017988
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 5; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Higgs physics

Citation Formats

Kim, Jeong Han, and Lewis, Ian M. Loop induced single top partner production and decay at the LHC. United States: N. p., 2018. Web. doi:10.1007/jhep05(2018)095.
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Kim, Jeong Han, & Lewis, Ian M. Loop induced single top partner production and decay at the LHC. United States. doi:10.1007/jhep05(2018)095.
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Kim, Jeong Han, and Lewis, Ian M. Tue . "Loop induced single top partner production and decay at the LHC". United States. doi:10.1007/jhep05(2018)095. https://www.osti.gov/servlets/purl/1512400.
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@article{osti_1512400,
title = {Loop induced single top partner production and decay at the LHC},
author = {Kim, Jeong Han and Lewis, Ian M.},
abstractNote = {Most searches for top partners, T , are concerned with top partner pair production. However, as these bounds become increasingly stringent, the LHC energy will saturate and single top partner production will become more important. In this paper we study the novel signature of the top partner produced in association with the SM top, p p → T t ¯ + t T ¯ , in a model where the Standard Model (SM) is extended by a vector-like SU(2)L singlet fermion top partner and a real, SM gauge singlet scalar, S. In this model, p p → T t ¯ + t T ¯ production is possible through loops mediated by the scalar singlet. We find that, with reasonable coupling strengths, the production rate of this channel can dominate top partner pair production at top partner masses of mT ≳ 1.5 TeV. In addition, this model allows for the exotic decay modes T → tg, T → tγ, and T → tS. In much of the parameter space the loop induced decay T → tg dominates and the top partner is quite long lived. New search strategies are necessary to cover these decay modes. We project the the sensitivity of the high luminosity LHC to p p → T t ¯ + t T ¯ via a realistic collider study. We find with 3 ab-1, the LHC is sensitive to this process for masses mT ≲ 2 TeV. In addition, we provide appendices detailing the renormalization of this model.},
doi = {10.1007/jhep05(2018)095},
journal = {Journal of High Energy Physics (Online)},
number = 5,
volume = 2018,
place = {United States},
year = {2018},
month = {5}
}
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DOI:  10.1007/jhep05(2018)095
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Figures / Tables:

Figure 1 Figure 1: Top partner decay diagrams in the limit that $v$ → 0 and EW symmetry is restored. Counterterms and external flavor changing self-energies are not shown.
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    Works referencing / citing this record:

    Shedding light on top partner at the LHC
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      Figures / Tables found in this record:

      Figure 1 (p. 7)figure
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      Figure 7 (p. 13)figure
      Table 1 (p. 13)table
      Figure 8 (p. 14)figure
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      Figure 11 (p. 19)figure
      Figure 12 (p. 20)figure
      Table 2 (p. 21)table
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      Table 4 (p. 26)table
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      Figure 21 (p. 37)figure
      Table 5 (p. 38)table
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