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No experimentally confirmed theory has replaced the Standard Model. The leading possibilities—supersymmetry, grand unified theories, extra dimensions, sterile-neutrino and hidden-sector models, axions, composite Higgs theories, and string theory—solve different parts of the problem. A successful successor must explain established evidence the Standard Model cannot, especially dark matter and neutrino mass, while surviving exceptionally precise collider, flavor, cosmological and gravitational tests.
Why physicists think the Standard Model is incomplete
The Standard Model is a quantum field theory describing quarks, leptons, gauge bosons and the Higgs field. It has passed an extraordinary range of tests, including precision measurements of electroweak interactions and the discovery of the Higgs boson. “Replace” therefore does not mean discarding everything in the model. Any successor must reproduce its successful predictions in the energy ranges already tested, just as Einstein’s relativity reproduces Newtonian mechanics where Newton works.
The minimal model is nevertheless incomplete. CERN and review articles identify several observations or theoretical conflicts that point beyond it.
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Dark matter
Stars, galaxies and the large-scale structure of the universe reveal more gravitational matter than telescopes see. CERN’s current explainer estimates that dark matter makes up roughly 27% of the universe, while ordinary matter contributes about 5%. Its particle identity is unknown. The Standard Model contains no stable, electrically neutral particle with the required cosmological properties, so dark matter is direct evidence for additional physics rather than merely an aesthetic concern.
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Nonzero neutrino masses
Neutrino oscillation experiments show that neutrinos change flavor as they travel, which requires mass differences and therefore nonzero neutrino masses. The minimal Standard Model treats neutrinos as massless. Extensions can add right-handed neutrinos, effective Majorana mass terms, or other heavy states that generate the tiny observed masses.
The matter–antimatter imbalance
The visible universe contains vastly more matter than antimatter. Known Standard Model sources of CP violation and nonequilibrium dynamics do not appear sufficient to generate the observed asymmetry. Leptogenesis, electroweak baryogenesis and related mechanisms add new particles or interactions to explain how an initially symmetric universe evolved into the matter-dominated one we observe.
Quantum gravity
The Standard Model is a quantum theory, but it does not quantize gravity. General relativity describes gravity as spacetime geometry and works on macroscopic scales; quantum field theory describes particles and forces on microscopic scales. A complete theory should explain both in regimes such as black-hole interiors or the earliest moments of the universe.
The Higgs hierarchy and naturalness questions
Quantum corrections tend to push the Higgs mass toward very high scales. Why its measured value is so much smaller than a presumed fundamental or unification scale is called the hierarchy or naturalness problem. This is a motivation for models such as supersymmetry and composite Higgs theories, but it is not an experimental proof that any particular solution is correct.
How to judge a proposed successor
“Beyond the Standard Model” (BSM) is a broad category, not one theory. Comparisons are most useful when they ask four concrete questions: Which established problem does a model address? What new particles or fields does it require? At what energies or distances should they appear? What observation could rule it out?
| Theory family | Main problems addressed | Characteristic tests | Current status |
|---|---|---|---|
| Supersymmetry | Higgs naturalness; possible dark matter; gauge-coupling unification | Partner particles, missing momentum, long-lived particles, displaced decays | No superpartner detected; simple weak-scale versions are strongly constrained, but non-minimal and less natural versions remain viable |
| Grand unified theories | Unification of strong, weak and electromagnetic forces; sometimes neutrino masses | Proton decay, monopoles, coupling evolution, quark–lepton mass relations | No proton-decay signal or unique prediction has selected a model |
| Extra dimensions and brane worlds | Gravity’s scale; hierarchy problem; possible dark matter | Kaluza–Klein states, resonances, missing energy, short-distance gravity tests | No confirmed extra-dimensional particle |
| Neutrino and hidden-sector extensions | Neutrino masses, leptogenesis, dark matter | Oscillation effects, rare decays, beam-dump events, portals and invisible signatures | Active searches; no new sector confirmed |
| Axions and axion-like particles | Strong-CP problem; possible dark matter | Haloscopes, helioscopes, stellar and astrophysical observations | Well-motivated candidate, but no axion discovery |
| Composite Higgs | Higgs naturalness and electroweak symmetry breaking | Top or Higgs coupling deviations, partner resonances | Active hypothesis without a confirmed composite signal |
| String theory | Quantum gravity and possible force unification | Indirect consistency conditions; distinctive low-energy signatures remain model-dependent | Powerful framework, but no unique experimentally verified prediction |
Supersymmetry: partner particles for every known particle
Supersymmetry (SUSY) extends spacetime symmetry so fermions and bosons are related. In a supersymmetric model, each known fermion has a bosonic partner and each known boson has a fermionic partner. The partners have not been observed, so SUSY must be broken at accessible energies, giving the partners different masses from their Standard Model counterparts.
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Why SUSY is attractive
Loops of superpartners can cancel large quantum corrections to the Higgs mass. This offers a mechanism for keeping a light Higgs natural rather than requiring a delicate cancellation between unrelated parameters. Many SUSY models also contain a stable lightest supersymmetric particle. If it is electrically neutral and interacts weakly, it can be a dark-matter candidate. Supersymmetric particles can additionally change the way the three gauge couplings evolve with energy, improving their convergence near a unification scale.
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At the LHC, searches examine missing transverse momentum from an invisible stable particle, cascades of jets and leptons, heavy-flavor signatures, resonances, and particles that travel a measurable distance before decaying. ATLAS continues to study non-minimal possibilities such as long-lived particles and displaced vertices. The absence of a signal has ruled out broad regions of the simplest weak-scale parameter choices, but it does not eliminate compressed spectra, heavy superpartners, unconventional decays or other non-minimal realizations. A 2025 review reported no confirmed supersymmetric particle.
Grand unified theories: one origin for three forces
Grand unified theories (GUTs) enlarge the Standard Model’s gauge symmetry so that the strong, weak and electromagnetic interactions arise from a single interaction at a much higher energy. At lower energies, the unified symmetry would break into the familiar forces.
Distinctive predictions
Quarks and leptons can occupy common multiplets, producing relationships between their charges and masses. Many GUTs allow quarks to transform into leptons, making proton decay possible. They can also predict magnetic monopoles, constrain neutrino masses and connect naturally with supersymmetry or string constructions. The unification scale, decay channel and proton lifetime differ from one model to another, so “GUT” is not one falsifiable prediction.
Experimental situation
Large underground detectors have searched for proton decay without a confirmed event. The non-observation places limits on classes of models and pushes some predicted lifetimes higher; it does not prove that all unification ideas are false. A convincing GUT signal would require a reproducible decay pattern or another distinctive prediction, together with consistency across particle and cosmological data.
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Extra dimensions and brane-world models
These proposals add spatial dimensions that are compactified, warped or otherwise hidden at ordinary energies. Standard Model particles may be confined to a lower-dimensional brane while gravity propagates through a larger space, or all fields may experience the extra dimensions in different ways.
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Possible signatures
Motion through a compact dimension appears in four-dimensional experiments as a tower of heavier Kaluza–Klein states. Colliders could produce such states as resonances or create missing energy when gravitons escape into additional dimensions. Deviations in gravity at short distances offer a complementary test. Some constructions contain stable states that could account for dark matter.
Searches have not established an extra-dimensional particle. Limits depend strongly on the geometry, compactification radius, warping and couplings, so a null result for one setup does not exclude every extra-dimensional model.
Neutrino-sector extensions and hidden sectors
Right-handed and sterile neutrinos
Adding right-handed neutrinos permits ordinary Dirac masses, while very heavy neutral states can generate tiny masses through a seesaw mechanism. If the mass terms are Majorana rather than Dirac, a neutrino can be its own antiparticle; neutrinoless double-beta decay would be a key test. Heavy states can also create a lepton asymmetry that is converted into the universe’s baryon asymmetry through leptogenesis.
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Experiments compare neutrino mass ordering, absolute mass, CP violation, disappearance and appearance probabilities, and possible sterile-neutrino mixing. Different mass scales produce different signatures: oscillations for relatively light sterile states, rare decays or displaced vertices for heavier ones, and cosmological effects for populations present in the early universe.
Portals and dark sectors
A hidden sector may contain particles that interact only weakly with Standard Model matter. Portal interactions can involve the Higgs, a new gauge boson, neutrinos or kinetic mixing with a dark photon. CERN’s SND@LHC experiment searches for weakly interacting particles not predicted by the Standard Model, including candidates that could contribute to dark matter. Beam-dump experiments, fixed-target facilities, rare-decay searches and missing-energy measurements probe parameter ranges that high-energy colliders can miss.
Axions: solving the strong-CP problem
Quantum chromodynamics permits a term that would violate CP symmetry, yet experiments show no corresponding strong-interaction effect. The Peccei–Quinn mechanism dynamically removes this term and predicts a light pseudoscalar particle called the axion. Axions and axion-like particles can also be dark matter, although the required mass and interaction strength depend on the production history.
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Because axions are extremely light and weakly coupled, their searches differ from ordinary collider programs. Resonant haloscopes look for conversion of galactic dark-matter axions in magnetic fields; helioscopes search for axions produced in the Sun; stellar evolution and astrophysical observations constrain additional couplings. A signal must be distinguished from electromagnetic noise and reproduced with the expected dependence on magnetic field, frequency or source direction.
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Composite-Higgs models treat the Higgs as a bound state of a new strong interaction, analogous in broad outline to how quarks bind into hadrons. The Higgs would appear light because it is a pseudo–Nambu–Goldstone boson rather than an elementary scalar. These models address naturalness without requiring the exact superpartner spectrum of SUSY.
Strong dynamics generally predict heavier partner resonances, especially partners associated with the top quark, and small deviations in Higgs, top and electroweak couplings. Precision measurements can therefore test compositeness even when resonances are too heavy to produce directly. Current sources identify composite Higgs models as active hypotheses, not as an experimentally established replacement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.String theory and quantum gravity
String theory replaces point particles with one-dimensional extended objects. Different vibrational modes appear as different particles, and a quantum excitation associated with gravity arises naturally. Consistency usually requires extra dimensions, which must be compactified or otherwise hidden. Compactification can produce gauge groups, matter fields and interactions resembling those of particle physics.
Its central achievement is a framework in which quantum mechanics and gravity coexist. Its central empirical difficulty is the enormous number of possible compactifications and low-energy vacua. No unique, experimentally verified low-energy prediction currently makes string theory the accepted replacement for the Standard Model. It is better described as a quantum-gravity and unification program that may contain realistic models than as a discovered theory of nature.
What experiments could reveal next
The Large Hadron Collider
The LHC tests high-energy collisions for new resonances, supersymmetric cascades, missing transverse momentum, long-lived particles, displaced vertices and deviations in Higgs or flavor observables. Run 3 began in July 2022. A discovery would need statistically robust excesses, independent analyses and a pattern of decays that identifies the underlying particles rather than a detector or background error.
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Neutrino, dark-matter and rare-event experiments
Long-baseline neutrino facilities measure oscillation parameters, mass ordering and CP violation. Direct-detection experiments search for nuclear recoils from dark matter, while indirect searches look for annihilation or decay products in space. Electric-dipole-moment measurements test new CP violation relevant to baryogenesis and axion physics. Proton-decay detectors test GUTs. Beam-dump and fixed-target experiments are especially sensitive to feebly interacting hidden particles.
Precision Higgs and future colliders
Even if no new particle is produced directly, a successor can leave virtual effects in Higgs couplings, electroweak observables, flavor transitions or rare decays. CERN’s future-collider planning emphasizes precise Higgs measurements alongside direct discovery opportunities. Precision data are valuable because many BSM theories predict correlated, small deviations rather than one spectacular event.
What would count as a genuine replacement?
A convincing successor would need more than one unexplained bump. It should reproduce all established Standard Model results, explain at least one confirmed gap such as dark matter or neutrino mass, make quantitative predictions that can be tested, and survive precision constraints. Ideally, independent experiments would observe related effects—for example, a new particle at a collider and the same particle’s interactions in a dark-matter or neutrino experiment.
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Bottom line
The Standard Model has no confirmed replacement as of 2026. Dark matter, neutrino masses, the matter–antimatter imbalance and quantum gravity establish that the minimal model is not the final description, while the Higgs hierarchy problem motivates additional ideas. Supersymmetry, GUTs, extra dimensions, neutrino and hidden sectors, axions, composite Higgs models and string theory each address different pieces and make different predictions. Progress is most likely to come from combining collider, neutrino, dark-matter, precision, gravitational and cosmological evidence rather than waiting for one guaranteed “final theory.”
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