Brookhaven E821 experiment
E373839
The Brookhaven E821 experiment was a high-precision particle physics experiment at Brookhaven National Laboratory that measured the anomalous magnetic moment of the muon, providing an important test of the Standard Model.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Brookhaven E821 experiment canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T3616169 — 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: Brookhaven E821 experiment Context triple: [Muon g-2 experiment, precededBy, Brookhaven E821 experiment]
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A.
Brookhaven Linac Isotope Producer
The Brookhaven Linac Isotope Producer is a particle-accelerator-based facility at Brookhaven National Laboratory that generates medical and research isotopes for nuclear medicine and scientific applications.
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B.
SPS Heavy Ion and Neutrino Experiment
The SPS Heavy Ion and Neutrino Experiment (NA61/SHINE) is a fixed-target particle physics experiment at CERN’s Super Proton Synchrotron that studies hadron production in proton, pion, and ion collisions for strong-interaction physics and neutrino beam characterization.
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C.
Kamiokande experiment
The Kamiokande experiment was a pioneering Japanese neutrino observatory that provided key evidence for solar and atmospheric neutrinos, contributing to the discovery of neutrino oscillations.
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D.
Cockcroft–Walton experiment
The Cockcroft–Walton experiment was a pioneering 1932 nuclear physics experiment that achieved the first artificial disintegration of atomic nuclei using accelerated protons, confirming Einstein’s mass–energy equivalence.
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E.
GBAR experiment
The GBAR experiment is a physics research project at CERN designed to study the behavior of antihydrogen in Earth's gravitational field to test the equivalence principle with antimatter.
- 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: Brookhaven E821 experiment Target entity description: The Brookhaven E821 experiment was a high-precision particle physics experiment at Brookhaven National Laboratory that measured the anomalous magnetic moment of the muon, providing an important test of the Standard Model.
-
A.
Brookhaven Linac Isotope Producer
The Brookhaven Linac Isotope Producer is a particle-accelerator-based facility at Brookhaven National Laboratory that generates medical and research isotopes for nuclear medicine and scientific applications.
-
B.
SPS Heavy Ion and Neutrino Experiment
The SPS Heavy Ion and Neutrino Experiment (NA61/SHINE) is a fixed-target particle physics experiment at CERN’s Super Proton Synchrotron that studies hadron production in proton, pion, and ion collisions for strong-interaction physics and neutrino beam characterization.
-
C.
Kamiokande experiment
The Kamiokande experiment was a pioneering Japanese neutrino observatory that provided key evidence for solar and atmospheric neutrinos, contributing to the discovery of neutrino oscillations.
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D.
Cockcroft–Walton experiment
The Cockcroft–Walton experiment was a pioneering 1932 nuclear physics experiment that achieved the first artificial disintegration of atomic nuclei using accelerated protons, confirming Einstein’s mass–energy equivalence.
-
E.
GBAR experiment
The GBAR experiment is a physics research project at CERN designed to study the behavior of antihydrogen in Earth's gravitational field to test the equivalence principle with antimatter.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
high-precision measurement
ⓘ
muon g-2 experiment ⓘ particle physics experiment ⓘ |
| aim |
to search for indirect evidence of physics beyond the Standard Model
ⓘ
to test Standard Model predictions for muon g-2 ⓘ |
| collaborationSize | international collaboration ⓘ |
| conclusion | measured muon g-2 value showed tension with Standard Model prediction ⓘ |
| country | United States of America ⓘ |
| dataType |
magnetic field measurements from NMR probes
ⓘ
muon decay positron events ⓘ |
| field |
experimental high-energy physics
ⓘ
precision measurements in particle physics ⓘ |
| fieldStrength | approximately 1.45 tesla ⓘ |
| hostInstitution | Brookhaven National Laboratory ⓘ |
| inspired |
Muon g-2 experiment
ⓘ
surface form:
Fermilab Muon g-2 experiment
|
| involves |
electroweak interactions
ⓘ
hadronic light-by-light scattering ⓘ hadronic vacuum polarization ⓘ quantum electrodynamics ⓘ |
| locatedIn |
Brookhaven National Laboratory
ⓘ
Upton, New York ⓘ |
| measures |
anomalous magnetic dipole moment of the muon
ⓘ
magnetic field in storage ring ⓘ muon spin precession frequency ⓘ |
| precededBy | earlier muon g-2 experiments at CERN ⓘ |
| publicationType | peer-reviewed physics journals ⓘ |
| relatedTo |
anomalous magnetic moment of the electron
ⓘ
precision frontier in particle physics ⓘ |
| resultType |
precision test of Standard Model electroweak and hadronic contributions
ⓘ
precision test of quantum field theory ⓘ |
| ringCircumference | approximately 44 meters ⓘ |
| ringRadius | approximately 7 meters ⓘ |
| runPeriod |
early 2000s
ⓘ
late 1990s ⓘ |
| significance |
hinted at possible new physics contributions
ⓘ
provided one of the most precise tests of the Standard Model ⓘ |
| studies |
muon anomalous magnetic moment
ⓘ
muon g-2 ⓘ |
| testsTheory |
Standard Model
ⓘ
surface form:
Standard Model of particle physics
|
| theoryInput | Standard Model calculation of muon g-2 ⓘ |
| uses |
NMR probes to map magnetic field
ⓘ
calorimeters to detect decay positrons ⓘ decay positron detection ⓘ electrostatic quadrupoles for vertical focusing ⓘ kicker magnets to inject muons into storage ring ⓘ polarized muon beam ⓘ storage ring ⓘ superconducting magnetic storage ring ⓘ |
| usesMethod |
spin precession in uniform magnetic field
ⓘ
time spectrum of decay positrons ⓘ |
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: Brookhaven E821 experiment Description of subject: The Brookhaven E821 experiment was a high-precision particle physics experiment at Brookhaven National Laboratory that measured the anomalous magnetic moment of the muon, providing an important test of the Standard Model.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.