LEX-EFT: The Light Exotics Effective Field Theory

Abstract

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 $\mathrm{SU}(2{)}_{\text{L}}$ 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.

arXiv comment32 pages, 8 figures. Updated to resemble JHEP Version of Record

References in corpus (46)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Dimension-Six Terms in the Standard Model Lagrangian
• MadAnalysis 5, a user-friendly framework for collider phenomenology
• Constraints on Dark Matter from Colliders
• Constraints on Light Majorana Dark Matter from Colliders
• Bosonic Supersymmetry? Getting Fooled at the LHC
• The automation of next-to-leading order electroweak calculations
• ALPs Effective Field Theory and Collider Signatures
• Designing and recasting LHC analyses with MadAnalysis 5
• Flavor Changing Neutral Currents, an Extended Scalar Sector, and the Higgs Production Rate at the LHC
• Operator bases, $S$-matrices, and their partition functions
• On the single leptoquark solutions to the $B$-physics anomalies
• Seeking Sgluons
• Hilbert Series for Constructing Lagrangians: expanding the phenomenologist's toolbox
• Confronting new physics theories to LHC data with MadAnalysis 5
• Colored Resonant Signals at the LHC: Largest Rate and Simplest Topology
• Hilbert series and operator bases with derivatives in effective field theories
• A superspace module for the FeynRules package
• BasisGen: automatic generation of operator bases
• Color Sextet Scalars at the CERN Large Hadron Collider
• Making the small oblique parameters large
• Simplified fast detector simulation in MadAnalysis 5
• Enumerating the operators of an effective field theory
• QCD Corrections to Scalar Diquark Production at Hadron Colliders
• DEFT: A program for operators in EFT
• Leptoquark manoeuvres in the dark: a simultaneous solution of the dark matter problem and the $R_{D^{(\ast )}}$ anomalies
• Color-Octet-Electroweak-Doublet Scalars and the CDF Dijet Anomaly
• Characters and Group Invariant Polynomials of (Super)fields: Road to "Lagrangian"
• Quantum Ostrogradsky theorem
• Effective Operator Bases for Beyond Standard Model Scenarios: An EFT compendium for discoveries
• Changing patterns in electroweak precision with new color-charged states: Oblique corrections and the $W$ boson mass
• LHC bounds on coloured scalars
• Exploring color-octet scalar parameter space in minimal $R$-symmetric models
• Unitarity Bounds on Effective Field Theories at the LHC
• Universal extra dimension: Violation of Kaluza-Klein parity
• Model-independent constraints with extended dark matter EFT
• Color-octet scalars in Dirac gaugino models with broken $R$ symmetry
• Color-octet scalar decays to a gluon and an electroweak gauge boson in the Manohar-Wise model
• Leptonic signatures of color-sextet scalars
• Exploring the phenomenology of weak adjoint scalars in minimal $R$-symmetric models
• Di-jet/$e^{+}{e}^{-}$+ MET to Probe $Z_2-$Odd Mediators to the Dark Sector
• Renormalization and ultraviolet sensitivity of gauge vertices in universal extra dimensions
• On long-lived electroweak-singlet coloured scalars

Cited by in corpus (4)

• Leptonic signatures of color-sextet scalars II: Exploiting unique large-$E_{\text{T}}^{\text{miss}}$ signals at the LHC
• Dark matter with exotic mediators: The diquark portal
• Strong-Weak Bi-Adjoints, Gluon-W resonances, and new asymmetric LHC production processes
• The quark-lepton portal beyond leptoquarks