Nambu-Goldstone boson phenomenology in Domain-Wall Standard Model

Abstract

We investigate the Domain-Wall Standard Model (DWSM), a five-dimensional framework in which all Standard Model (SM) particles are localized on a domain wall embedded in a non-compact extra spatial dimension. A distinctive feature of this setup is the emergence of a Nambu-Goldstone (NG) boson, arising from the spontaneous breaking of translational invariance in the extra dimension due to the localization of SM chiral fermions. This NG boson couples via Yukawa interactions to SM fermions and their Kaluza-Klein (KK) excitations. We study the phenomenology of this NG boson and derive constraints from astrophysical processes (supernova cooling), Big Bang Nucleosynthesis (BBN), and collider searches for KK-mode fermions at the Large Hadron Collider (LHC). The strongest limits arise from LHC data: we reinterpret existing mass bounds on squarks and sleptons in simplified supersymmetric models (assuming a massless lightest neutralino), as well as limits on exotic hadrons containing long-lived squarks or long-lived charged sleptons in the regime of extremely small Yukawa couplings. From this analysis, we obtain a conservative lower bound of 1 TeV on the masses of KK-mode quarks and charged leptons. Finally, we discuss the prospects for producing KK-mode fermions at future high-energy lepton colliders and outline strategies to distinguish their signatures from those of sfermions.

arXiv comment20 pages, 2 figures, the version published in European Physical Journal C

References in corpus (32)

• A Large Mass Hierarchy from a Small Extra Dimension
• An Alternative to Compactification
• The Hierarchy Problem and New Dimensions at a Millimeter
• New Dimensions at a Millimeter to a Fermi and Superstrings at a TeV
• Dirichlet-Branes and Ramond-Ramond Charges
• The Einstein Equations on the 3-Brane World
• Non-conventional cosmology from a brane-universe
• Brane cosmological evolution in a bulk with cosmological constant
• Simplified Models for LHC New Physics Searches
• Simplified Models for a First Characterization of New Physics at the LHC
• Brane-world cosmology
• Towards a precision calculation of $N_{\mathrm{eff}}$ in the Standard Model II: Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED
• A precision calculation of relic neutrino decoupling
• Precision Early Universe Thermodynamics made simple: $N_{\mathrm{eff}}$ and Neutrino Decoupling in the Standard Model and beyond
• Neutrino decoupling beyond the Standard Model: CMB constraints on the Dark Matter mass with a fast and precise $N_{\mathrm{eff}}$ evaluation
• Model-Independent Jets plus Missing Energy Searches
• Search for heavy charged long-lived particles in the ATLAS detector in 36.1 fb${}^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV
• Towards a precision calculation of the effective number of neutrinos $N_{\mathrm{eff}}$ in the Standard Model I: The QED equation of state
• The standard model on a domain-wall brane?
• Almost No-Scale Supergravity
• The quest to discover supersymmetry at the ATLAS experiment
• On Effective Theory of Brane World with Small Tension
• Non-Abelian Gauge Field Localized on Walls with Four-Dimensional World Volume
• Grand Unified Brane World Scenario
• Matter Fields and Non-Abelian Gauge Fields Localized on Walls
• Non-Abelian Gauge Field Localization on Walls and Geometric Higgs Mechanism
• Localization of the Standard Model via Higgs mechanism and a finite electroweak monopole from non-compact five dimensions
• Localized non-Abelian gauge fields in non-compact extra-dimensions
• Domain-Wall Standard Model in non-compact 5D and LHC phenomenology
• Fermion Mass Hierarchy and Phenomenology in the 5D Domain Wall Standard Model
• Stabilizing matter and gauge fields localized on walls
• Search for heavy long-lived charged particles with large ionization energy loss in proton-proton collisions at $\sqrt{s}$ = 13 TeV