HEP (high energy physics)
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| HEP (high energy physics) | |
|---|---|
| Name | HEP (high energy physics) |
| Field | Physics |
| Institutions | CERN; Fermilab; SLAC; KEK; DESY; INFN; Brookhaven National Laboratory; TRIUMF |
| Notable people | Peter Higgs; Murray Gell-Mann; Richard Feynman; Sheldon Glashow; Abdus Salam; Gerard 't Hooft; Carlo Rubbia; Leon Lederman |
HEP (high energy physics) High energy physics investigates the properties and interactions of elementary particles using accelerators, detectors, and theoretical frameworks developed across institutions. Research programs at CERN, Fermilab, SLAC National Accelerator Laboratory, KEK, DESY, and Brookhaven National Laboratory link experimental campaigns to theoretical work from figures such as Peter Higgs, Murray Gell-Mann, Richard Feynman, and Gerard 't Hooft. The field spans collaborations involving ATLAS experiment, CMS experiment, LHCb experiment, Belle II, DUNE, and IceCube Neutrino Observatory, integrating instrumentation, computing, and international funding.
Overview and scope
High energy physics covers studies from searches for new particles at the Large Hadron Collider to precision measurements at facilities like LEP and RHIC, engaging organizations such as IHEP (China), KEK, INFN, TRIUMF, and DESY. The community organizes through collaborations including Particle Data Group, European Organization for Nuclear Research, and national laboratories like Brookhaven National Laboratory and Fermilab, coordinating projects that involve detectors like ATLAS experiment, CMS experiment, LHCb experiment, ALICE, Belle II, and T2K. Funding and policy oversight come from agencies such as the Department of Energy (United States), National Science Foundation, European Commission, STFC, and CNRS, connecting workshops at CERN and conferences like International Conference on High Energy Physics.
Fundamental theories and concepts
The Standard Model, shaped by theorists including Sheldon Glashow, Abdus Salam, Steven Weinberg, and Gerard 't Hooft, formalizes electroweak unification and quantum chromodynamics; extensions propose supersymmetry from ideas by Peter Fayet and Howard Georgi, grand unification theories associated with Georgi–Glashow model, and mechanisms like the Higgs mechanism advanced by Peter Higgs and François Englert. Quantum field theory techniques developed by Richard Feynman, Julian Schwinger, and Sin-Itiro Tomonaga underpin perturbative calculations, while nonperturbative methods such as lattice gauge theory engage groups at CERN and RIKEN. Neutrino mass and oscillation frameworks trace to experimental programs like Super-Kamiokande, SNO, T2K, and theoretical work by Bruno Pontecorvo and Maki Nakagawa Sakata. Dark matter and dark energy hypotheses connect particle proposals like WIMPs from Jungman, Kamionkowski, Griest and axions from Roberto Peccei and Helen Quinn to astrophysical searches at Gran Sasso and XENON collaborations.
Experimental methods and facilities
Accelerator technologies include superconducting magnets pioneered in projects at Fermilab and CERN, radio-frequency cavities developed at SLAC, and beamlines at KEK and DESY; major facilities comprise the Large Hadron Collider, Tevatron, RHIC, and proposed machines like the International Linear Collider and Future Circular Collider. Detector subsystems—tracking from ATLAS Inner Detector, calorimetry used by CMS experiment, and muon systems in OPERA—are built by consortia from University of Oxford, MIT, University of Tokyo, INFN, and DESY. Data acquisition and computing rely on grid and cloud resources coordinated by Worldwide LHC Computing Grid, high-performance computing centers at Argonne National Laboratory and NERSC, and software frameworks such as ROOT developed at CERN and Geant4 initiated by collaborations including CERN and SLAC.
Major discoveries and open questions
Major milestones include the discovery of the top quark at Fermilab and the Higgs boson announced by CERN's ATLAS experiment and CMS experiment teams, alongside neutrino oscillation confirmation by Super-Kamiokande and SNO. Outstanding puzzles involve the nature of dark matter probed by XENON, LUX-ZEPLIN, and AMS-02, the matter–antimatter asymmetry addressed by experiments like LHCb and Belle II, the hierarchy problem motivating proposals such as supersymmetry tested at LHC and Tevatron, and the strong CP problem inspiring axion searches at ADMX and CAST. The quest for quantum gravity and unification links to theoretical programs in string theory associated with Edward Witten and loop quantum gravity connected to Carlo Rovelli, while experimental searches for proton decay involve detectors like Super-Kamiokande and future Hyper-Kamiokande.
Applications and technology transfer
Techniques and devices from HEP have produced technologies adopted by CERN spin-offs and industry, including superconducting magnet technology used in MRI scanners developed with input from Siemens and General Electric, accelerator-driven isotope production at facilities like TRIUMF for medical imaging, and particle detector concepts applied in synchrotron radiation beamlines at ESRF and APS. Distributed computing methods from the Worldwide LHC Computing Grid and data-analysis tools like ROOT have influenced initiatives at Google, IBM, and Amazon Web Services, while vacuum, cryogenics, and RF engineering from projects at SLAC and DESY underpin satellite and telecommunications systems.
Education, collaboration, and funding
Training pipelines run through university programs at University of Cambridge, MIT, University of California, Berkeley, University of Tokyo, and University of Oxford, with graduate students and postdocs placed in collaborations at CERN, Fermilab, KEK, and DESY. International governance involves agreements among agencies such as the European Commission and Department of Energy (United States), collaborative frameworks like the International Committee for Future Accelerators, and advisory bodies including the Particle Physics Project Prioritization Panel. Major funding sources include national research councils like STFC, NSF, DOE Office of Science, and CNRS, which support long-term projects such as the LHC upgrades, DUNE, and proposed facilities like the Future Circular Collider and International Linear Collider.