Echoes of a Hidden Valley at Hadron Colliders

Abstract

We consider examples of ``hidden-valley'' models, in which a new confining gauge group is added to the standard model. Such models often arise in string constructions, and elsewhere. The resulting (electrically-neutral) bound states can have low masses and long lifetimes, and could be observed at the LHC and Tevatron. Production multiplicities are often large. Final states with heavy flavor are common; lepton pairs, displaced vertices and/or missing energy are possible. Accounting for LEP constraints, we find LHC production cross-sections typically in the 1-100 fb range, though they can be larger. It is possible the Higgs boson could be discovered at the Tevatron through rare decays to the new particles.

5 pages, 5 figures (v2: minor improvements, one added reference, no substantial changes)

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• LHC Implications of the WIMP Miracle and Grand Unification
• Search for long-lived particles decaying to final states with a pair of muons in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV
• Searching for new physics with three-particle correlations in $pp$ collisions at the LHC
• Semi-visible jets, energy-based models, and self-supervision
• Characterising the 750 GeV diphoton excess
• A Snowmass Whitepaper: Dark Matter Production at Intensity-Frontier Experiments
• Uncovering tau leptons-enriched semi-visible jets at the LHC
• Search for emerging jets in $pp$ collisions at $\sqrt{s}=13.6$ TeV with the ATLAS experiment
• Search for neutral long-lived particles that decay into displaced jets in the ATLAS calorimeter in association with leptons or jets using $pp$ collisions at $\sqrt{s}=13$ TeV
• Search for light long-lived particles in $pp$ collisions at $\sqrt{s}=13$ TeV using displaced vertices in the ATLAS inner detector
• Search for soft unclustered energy patterns in proton-proton collisions at 13 TeV
• Search for dark QCD with emerging jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Non-resonant Anomaly Detection with Background Extrapolation
• Baryons, multi-hadron systems, and composite dark matter in non-relativistic QCD
• Disorder and Mimesis at Hadron Colliders
• Flavored Dark Sectors running to low energy
• Simple Standard Model Extension by Heavy Charged Scalar
• Revealing Randall-Sundrum Hidden Valleys
• Exotic Higgs decays into displaced jets at the LHeC
• Data Driven Search in the Displaced $b\bar{b}$ Pair Channel for a Higgs Boson Decaying to Long-Lived Neutral Particles
• Dark Photon as Fractional Cosmic Neutrino Masquerader
• Dark Sector spectroscopy at the ILC
• Tagging Partially Reconstructed Objects with Jet Substructure
• Emerging Jets Displaced into the Future
• Probing displaced (dark)photons from low reheating freeze-in at the LHC
• Searching for hidden sector in multiparticle production at the LHC
• Unsupervised and lightly supervised learning in particle physics
• Fast Neural Network Inference on FPGAs for Triggering on Long-Lived Particles at Colliders
• Flesh and Blood, or Merely Ghosts? Some Comments on the Multi-Muon Study at CDF
• A Tale of Two-U(1) Axion Models
• A Bottom Line for the LHC Data by Leveraging Pileup as a Zero Bias Trigger
• Heavy Flavor & Dark Sector
• String (gravi)photons, "dark brane photons", holography and the hypercharge portal
• Flavor and CP Violation from a QCD-like Hidden Sector
• Search for light long-lived neutral particles from Higgs boson decays via vector-boson-fusion production from $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for low-mass resonances decaying into two jets and produced in association with a photon or a jet at $\sqrt{s}=13$ TeV with the ATLAS detector
• Sensitivities on dark photon from the Forward Physics Experiments
• Bound states and fermiophobic Unparticle oblique corrections to the photon
• Kinetic mixing between a Higgs and a nearly degenerate Dark scalar: oscillations and displaced vertices
• Review of Physics Results from the Tevatron: Higgs Boson Physics
• Protecting unparticles from the MSSM Higgs sector
• Search for Dark Matter Scattering from Optically Levitated Nanoparticles
• Triggering Dark Showers with Conditional Dual Auto-Encoders
• Modified Dark Matter in Galaxies and Galaxy Clusters
• Strongly Coupled Sectors in Inflation: Gapless Theories and Unparticles
• Massively Parallel Computing and the Search for Jets and Black Holes at the LHC
• Closing the light gluino gap with electron-proton colliders
• Search for exotic long-lived particles at CLIC
• The Hierarchy Problem: From the Fundamentals to the Frontiers
• Search for long-lived particles using out-of-time trackless jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Physics at a Higgs Factory
• Diphoton Excess through Dark Mediators
• Thermal evolution of dark matter and gravitational-wave production in the early universe from a symplectic glueball model
• Metastable Vacua in Warped Throats at Non-Isolated Singularities
• Sub-GeV Dark Matter Direct Detection with Neutrino Observatories
• Directional Detectability of Dark Matter With Single Phonon Excitations: Target Comparison
• Quirk SUEP
• A low-mass dark matter project, ALETHEIA: A Liquid hElium Time projection cHambEr In dArk matter
• The INTEGRAL/SPI 511 keV Signal from Hidden Valleys in Type Ia and Core Collapse Supernova Explosions
• Challenges for QCD theory - some personal reflections -
• SuperCool Inflation: A Graceful Exit from Eternal Inflation at LHC Scales and Below
• Autoencoders for Real-Time SUEP Detection
• Searching for hidden matter with long-range angular correlations at $e^{+}{e}^{-}$ colliders
• Neural networks for boosted di-$\tau$ identification
• H Marks the Spot: Searching for Exotic Production of Higgs + X to Map Out New Physics
• Cosmological analogies in the search for new physics in high-energy collisions
• CDF Multi-Muon Events and Singlet Extensions of the MSSM
• Dark Sector Showers and Hadronisation in Herwig 7
• Searches for Long-lived Particles at the Tevatron Collider
• Search for events with one displaced vertex from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in $pp$ collisions at $\sqrt{s}=13$ TeV
• Heavy long-lived fractionally charged leptons in novel $3-3-1$ model
• 2B or not 2B, a study of bottom-quark-philic semi-visible jets
• APEX: A Prime EXperiment at Jefferson Lab
• Sub-GeV dark matter and multi-decay signatures from dark showers at beam-dump experiments
• From oversimplified to overlooked: the case for exploring Rich Dark Sectors
• Planar Equivalence 2006
• Radiative decays of a singlet scalar boson through vector-like quarks
• Liquid Scintillators for Large Area Tracking System
• Multi-track Displaced Vertices at B-Factories
• Wasserstein normalized autoencoder for anomaly detection
• We must know. We will know
• Indirect detection of long-lived particles in a rich dark sector with a dark vector portal
• New Physics Searches at Kaon and Hyperon Factories
• The Forward Physics Facility at the High-Luminosity LHC
• Exploiting exotic LHC datasets for long-lived new particle searches
• Undecay
• A first study of Hidden Valley models at the LHC
• Exploring hidden sectors with two-particle angular correlations at future $e^{+}{e}^{-}$ colliders
• Searching for displaced vertices with a gaseous tracker for a future e${}^{+}$e${}^{-}$ Higgs factory
• Hyper Stealth Dark Matter and Long-Lived Particles
• Constraining portals with displaced Higgs decay searches at the LHC
• Stopping Dark Mesons in Their Tracks with Long-Lived Particle and Resonant Signatures
• Search for b hadron decays to long-lived particles in the CMS endcap muon detectors
• Search for low-mass hidden-valley dark showers with non-prompt muon pairs in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for heavy long-lived charged particles with level-1 trigger scouting data from proton-proton collisions at $\sqrt{s}$ = 13.6 TeV
• Muon Excess in Cosmic Rays and at CDF: Signs for a Hidden Sector?
• Searches for phenomena beyond the Standard Model at the LHC with the ATLAS and CMS detectors
• Axion-Assisted Electroweak Baryogenesis
• Flashes of Hidden Worlds at Colliders
• The Light Gluino Gap
• Search for physics beyond the standard model in events with overlapping photons and jets
• The Dark Photon: a 2026 Perspective
• Search for soft unclustered energy patterns produced in association with a W or Z boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Event-level variables for semivisible jets using anomalous jet tagging
• Selection of LHCb results from Run I
• Dark Unification: a UV-complete Theory of Asymmetric Dark Matter
• A Field Guide to Event-Shape Observables Using Optimal Transport
• Producing and constraining self-interacting hidden sector dark matter
• Search for Z' Radiating from the Dark Matter at the LHC
• Searches for Majorana Neutrinos and Direct Searches for Exotics at LHCb
• Revisiting the averaged annihilation rate of thermal relics at low temperature
• Rare Higgs three body decay induced by top-Higgs FCNC coupling in the littlest Higgs Model with T-parity
• Some Aspects of New CDM Models and CDM Detection Methods
• Optimal Mass Variables for Semivisible Jets
• Integer solutions to the anomaly equations for a class of chiral gauge theories
• Theory, phenomenology, and experimental avenues for dark showers: a Snowmass 2021 report
• The ALPs from the Top: Searching for long lived axion-like particles from exotic top decays
• Automated NLO/NLL Monte Carlo programs for the LHC
• Multi-scalar signature of self-interacting dark matter in the NMSSM and beyond
• Theory Advances in BSM Physics
• Search for Stopped Gluinos in pp collisions at sqrt(s)=7 TeV at CMS
• Exotic spectroscopy and decays: prospects for colliders
• Overview of the ESCAPE Dark Matter Test Science Project for Astronomers
• Probing the Chern-Simons Portal at the HL-LHC through Displaced Vertices from W Boson Associated Production
• Dark scalar reinterpretation of searches for Higgs boson decays into long-lived particles at the LHC
• Search for Higgs boson exotic decays into Lorentz-boosted light bosons in the four-$\tau$ final state at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for emerging jets in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS experiment
• Search for displaced vertices arising from decays of new heavy particles in 7 TeV pp collisions at ATLAS
• Spectral distortions in the decaying QCD dark matter scenario