Exploring the phenomenology of weak adjoint scalars in minimal R-symmetric models

Carpenter, Linda M.; Smylie, Matthew J.

doi:10.1007/jhep02(2022)102

Cited by 4 publications

(2 citation statements)

References 49 publications

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“…We then find a characteristic multi-gauge boson topology for the collider production of these states. We have previously studied some models with gauge boson final states [13,18], but there is a lot of ground left to cover. One interesting example is the associated production of a multiply charged SU(2) L quintet state via the effective operator…”

Section: Filling Out the Catalog; Phenomenological Observationsmentioning

confidence: 99%

LEX-EFT: The light exotics effective field theory

Carpenter¹,

Murphy²,

Smylie³

2023

Preprint

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We propose the creation of a Light Exotics Effective Field Theory (LEX-EFT) catalog. LEX-EFT is a generic framework to capture all interactions between the Standard Model (SM) and all (or at least a large class of) theoretically allowed exotic states beyond the Standard Model (bSM), indexed by their SM and bSM charges. These states are light enough to be on or nearly on shell in some collider processes. This framework, which subsumes beyond the Standard Model paradigms as generally as possible, is meant to extend recent successful implementations of bSM EFTs and complement e.g. the Standard Model Effective Field Theory (SMEFT), which can capture the off-shell effects of exotic fields. In this work, we review a general method for the construction of a complete list of gauge-invariant operators involving SM interactions with light exotics via iterative tensor product decomposition, up to the desired order in mass dimension. Each operator is characterized by specific Clebsch-Gordan coefficients determined by the charge flow; we show how this charge flow affects the range of EFT validity and cross sections associated with an effective operator.We create an example catalog of exotic scalars coupling to SM gauge boson pairs, and we highlight some operators with exotic weak SU(2) L charges that can produce spectacular LHC phenomenology. We further demonstrate the utility of the LEX-EFT approach with several examples of effects on kinematic distributions and cross sections that would not be captured by EFTs agnostic to the exotic degrees of freedom and may evade the main inclusive collider searches tailored to the existing preferred set of standard bSM theories.

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Section: Filling Out the Catalog; Phenomenological Observationsmentioning

confidence: 99%

LEX-EFT: The light exotics effective field theory

Carpenter¹,

Murphy²,

Smylie³

2023

Preprint

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show abstract

“…A fair share of that attention has gone to the aforementioned adjoint scalars, particularly the SU(3) c adjoint (color-octet) scalars (sgluons) [59][60][61][62][63][64], though the weak hypercharge adjoint has been used to explain experimental anomalies in the past [65,66] and the weak isospin adjoints have been scrutinized more recently [67,68]. The color-octet scalars -of which there are two, a scalar and a pseudoscalar, if they conserve CP -couple at tree level only to colored supersymmetric particles and gluons, the latter of which allows copious pair production at the LHC.…”

Section: Introductionmentioning

confidence: 99%

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

Carpenter,

Murphy,

Smylie

2021

Preprint

Self Cite

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We reinterpret two recent LHC searches for events containing four top quarks (t tt 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 tt 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 jets and 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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LEX-EFT: the Light Exotics Effective Field Theory

Carpenter,

Murphy,

Smylie

2023

J. High Energ. Phys.

View full text Add to dashboard Cite

We propose the creation of a Light Exotics Effective Field Theory (LEX-EFT) catalog. LEX-EFT is a generic framework to capture all interactions between the Standard Model (SM) and all (or at least a large class of) theoretically allowed exotic states beyond the Standard Model (bSM), indexed by their SM and bSM charges. These states are light enough to be on or nearly on shell in some collider processes. This framework, which subsumes beyond the Standard Model paradigms as generally as possible, is meant to extend recent successful implementations of bSM EFTs and complement e.g. the Standard Model Effective Field Theory (SMEFT), which can capture the off-shell effects of exotic fields. In this work, we review a general method for the construction of a complete list of gauge-invariant operators involving SM interactions with light exotics via iterative tensor product decomposition, up to the desired order in mass dimension. Each operator is characterized by specific Clebsch-Gordan coefficients determined by the charge flow; we show how this charge flow affects the range of EFT validity and cross sections associated with an effective operator. We create an example catalog of exotic scalars coupling to SM gauge boson pairs, and we highlight some operators with exotic weak SU(2)L charges that can produce spectacular LHC phenomenology. We further demonstrate the utility of the LEX-EFT approach with several examples of effects on kinematic distributions and cross sections that would not be captured by EFTs agnostic to the exotic degrees of freedom and may evade the main inclusive collider searches tailored to the existing preferred set of standard bSM theories.

show abstract

Exploring the phenomenology of weak adjoint scalars in minimal R-symmetric models

Cited by 4 publications

References 49 publications

LEX-EFT: The light exotics effective field theory

LEX-EFT: The light exotics effective field theory

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

LEX-EFT: the Light Exotics Effective Field Theory

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