Loop induced single top partner production and decay at the LHC

doi:10.1007/jhep05(2018)095

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

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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, $p p \to T \bar{t} + t \bar{T}$ , 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, $p p \to T \bar{t} + t \bar{T}$ 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 m _T ≳ 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 $p p \to T \bar{t} + t \bar{T}$ via a realistic collider study. We find with 3 ab ^-1, the LHC is sensitive to this process for masses m _T ≲ 2 TeV. In addition, we provide appendices detailing the renormalization of this model.

Authors:

Kim, Jeong Han ^[1]; Lewis, Ian M. ^[1]

Univ. of Kansas, Lawrence, KS (United States). Dept. of Physics and Astronomy

Publication Date:: 2018-05-15

Research Org.:: Univ. of Kansas, Lawrence, KS (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

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:: 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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