$t\overline{t}t\overline{t}$ signatures through the lens of color-octet scalars

Carpenter, Linda M.; Murphy, Taylor; Smylie, Matthew J.

doi:10.1007/jhep01(2022)047

Title: $$t\overline{t}t\overline{t}$$ signatures through the lens of color-octet scalars

Journal Article · 10 January 2022 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep01(2022)047 · OSTI ID:1976426

Carpenter, Linda M. ^[1];

^[2]; Smylie, Matthew J. ^[2]

The Ohio State University, Columbus, OH (United States); The Ohio State Univ., Columbus, OH (United States)
The Ohio State University, Columbus, OH (United States)

We reinterpret two recent LHC searches for events containing four top quarks ($$t\overline{t}t\overline{t}$$) in the context of supersymmetric models with Dirac gauginos and color-octet scalars (sgluons). We explore whether sgluon contributions to the four-top production cross section σ ($pp$ → $$t\overline{t}t\overline{t}$$) can accommodate an excess of four-top events recently reported by the ATLAS collaboration. We also study constraints on these models from an ATLAS search for new phenomena with high jet multiplicity and significant missing transverse energy ($$E^{miss}_{T}$$) sensitive to signals with four top quarks. We find that these two analyses provide complementary constraints, with the jets + $$E^{miss}_{T}$$ search exceeding the four-top cross section measurement in sensitivity for sgluons heavier than about 800 GeV. We ultimately find that either a scalar or a pseudoscalar sgluon can currently fit the ATLAS excess in a range of reasonable benchmark scenarios, though a pseudoscalar in minimal Dirac gaugino models is ruled out. We finally offer sensitivity projections for these analyses at the HL-LHC, mapping the 5σ discovery potential in sgluon parameter space and computing exclusion limits at 95% CL in scenarios where no excess is found.

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Research Organization:: The Ohio State University, Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0011726

OSTI ID:: 1976426

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 1 Vol. 2022; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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