Shedding light on top partner at the LHC

Alhazmi, Haider; Kim, Jeong Han; Kong, Kyoungchul; Lewis, Ian M.

doi:10.1007/jhep01(2019)139

Title: Shedding light on top partner at the LHC

Journal Article · 15 January 2019 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep01(2019)139 · OSTI ID:1612797

Alhazmi, Haider ^[1]; Kim, Jeong Han ^[2]; Kong, Kyoungchul ^[2]; Lewis, Ian M. ^[2]

Univ. of Kansas, Lawrence, KS (United States); Jazan Univ. (Saudi Arabia); DOE/OSTI
Univ. of Kansas, Lawrence, KS (United States)

We investigate the sensitivity of the 14 TeV LHC to pair-produced top partners (T) decaying into the Standard Model top quark (t) plus either a gluon (g) or a photon (γ). The decays T → tg and T → tγ can be dominant when the mixing between the top partner and top quark are negligible. In this case, the conventional decays T → bW , T → tZ, and T → th are highly suppressed and can be neglected. We take a model-independent approach using effective operators for the T-t-g and T-t-γ interactions, considering both spin-$$\frac{1}{2}$$ and spin-$$\frac{3}{2}$$ top partners. We perform a semi-realistic simulation with boosted top quark tagging and an appropriate implementation of a jet-faking-photon rate. Despite a simple dimensional analysis indicating that the branching ratios BR(T → tγ) ≪ BR(T → tg) due to the electric-magnetic coupling being much smaller than the strong force coupling, our study shows that the LHC sensitivity to $$T\bar{T} → t\bar{t}γg$$ is more significant than the sensitivity to $$T\bar{T}→ t\bar{t}gg$$. This is due to much smaller backgrounds attributed to the isolated high-p_T photon. We find that with these decay channels and 3 ab^-1 of data, the LHC is sensitive to top partner masses m_T ≲ 1.4-1.8 TeV for spin-$$\frac{1}{2}$$ and spin-$$\frac{3}{2}$$ top partners, respectively.

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0017965; SC0017988

OSTI ID:: 1612797

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 1 Vol. 2019; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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