DIRAC experiment
E565050
The DIRAC experiment is a high-energy physics project at CERN designed to study pionium (a bound state of a π⁺ and π⁻ meson) to test predictions of low-energy quantum chromodynamics.
All labels observed (1)
| Label | Occurrences |
|---|---|
| DIRAC experiment canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6034017 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: DIRAC experiment Context triple: [DIRAC, fullName, DIRAC experiment]
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A.
DUNE experiment
The DUNE experiment is a major international neutrino physics project designed to study neutrino oscillations, matter–antimatter asymmetry, and proton decay using intense neutrino beams and massive underground detectors.
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B.
COMPASS experiment
The COMPASS experiment is a high-energy physics experiment at CERN designed to study the structure and dynamics of hadrons using intense muon and hadron beams.
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C.
Wu experiment
The Wu experiment was a landmark 1956 nuclear physics experiment that demonstrated the violation of parity conservation in weak interactions, fundamentally reshaping our understanding of fundamental symmetries in nature.
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D.
ATRAP experiment
The ATRAP experiment is a particle physics project at CERN dedicated to trapping and studying antihydrogen atoms and other antimatter systems to test fundamental symmetries and the properties of antimatter.
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E.
Muon g-2 experiment
The Muon g-2 experiment is a high-precision particle physics experiment that measures the anomalous magnetic moment of the muon to test the limits of the Standard Model and search for signs of new physics.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: DIRAC experiment Target entity description: The DIRAC experiment is a high-energy physics project at CERN designed to study pionium (a bound state of a π⁺ and π⁻ meson) to test predictions of low-energy quantum chromodynamics.
-
A.
DUNE experiment
The DUNE experiment is a major international neutrino physics project designed to study neutrino oscillations, matter–antimatter asymmetry, and proton decay using intense neutrino beams and massive underground detectors.
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B.
COMPASS experiment
The COMPASS experiment is a high-energy physics experiment at CERN designed to study the structure and dynamics of hadrons using intense muon and hadron beams.
-
C.
Wu experiment
The Wu experiment was a landmark 1956 nuclear physics experiment that demonstrated the violation of parity conservation in weak interactions, fundamentally reshaping our understanding of fundamental symmetries in nature.
-
D.
ATRAP experiment
The ATRAP experiment is a particle physics project at CERN dedicated to trapping and studying antihydrogen atoms and other antimatter systems to test fundamental symmetries and the properties of antimatter.
-
E.
Muon g-2 experiment
The Muon g-2 experiment is a high-precision particle physics experiment that measures the anomalous magnetic moment of the muon to test the limits of the Standard Model and search for signs of new physics.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
CERN experiment
ⓘ
nuclear physics experiment ⓘ particle physics experiment ⓘ |
| aimsToDetermine | ππ scattering length combination a₀−a₂ ⓘ |
| collaborationIncludes |
European institutes
ⓘ
Japanese institutes ⓘ Russian institutes ⓘ |
| collaborationType | international collaboration ⓘ |
| country | Switzerland ⓘ |
| dataTakingStarted | 1999 ⓘ |
| detects |
atomic pairs from pionium breakup
ⓘ
π⁺π⁻ pairs ⓘ |
| focusesOn | short-lived pionium states ⓘ |
| fullName | DIRAC (Dimeson Relativistic Atom Complex) NERFINISHED ⓘ |
| hostOrganization | CERN NERFINISHED ⓘ |
| locatedAt | CERN Proton Synchrotron NERFINISHED ⓘ |
| locatedIn | CERN ⓘ |
| locatedInCity | Meyrin NERFINISHED ⓘ |
| locatedNear | Geneva NERFINISHED ⓘ |
| measures |
difference of isospin 0 and 2 ππ scattering lengths
ⓘ
pionium lifetime ⓘ ππ S-wave scattering lengths ⓘ |
| primaryGoal | study of pionium atoms ⓘ |
| produces | precision tests of low-energy QCD ⓘ |
| relatedTo |
chiral symmetry breaking
ⓘ
isospin symmetry breaking ⓘ ππ scattering ⓘ |
| researchField |
hadron physics
ⓘ
meson physics ⓘ strong interaction ⓘ |
| status | completed data taking ⓘ |
| studies |
hadronic atoms
ⓘ
pionium ⓘ π⁺π⁻ atoms ⓘ |
| targetMaterial | thin metal foils ⓘ |
| testsTheory |
chiral perturbation theory
ⓘ
low-energy quantum chromodynamics ⓘ |
| uses |
Cherenkov detectors
NERFINISHED
ⓘ
high-intensity proton beam ⓘ magnetic spectrometer ⓘ thin target ⓘ time-of-flight detectors ⓘ tracking detectors ⓘ |
| usesAccelerator | Proton Synchrotron NERFINISHED ⓘ |
| usesBeamEnergy | 24 GeV/c protons ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: DIRAC experiment Description of subject: The DIRAC experiment is a high-energy physics project at CERN designed to study pionium (a bound state of a π⁺ and π⁻ meson) to test predictions of low-energy quantum chromodynamics.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.