Hypothetical particles are proposed physical entities that extend or modify established particle content in a given theoretical framework, typically introduced to resolve inconsistencies, explain unexplained phenomena, or complete symmetries in high-energy and gravitational physics. As physical systems, they are characterized by well-defined quantum numbers, interaction types, mass scales, and roles in Lagrangian formulations, yet they lack direct experimental confirmation. Examples in model-building include particles postulated in supersymmetry, grand unified theories, dark matter and dark energy models, and quantum gravity scenarios, where their properties are constrained by consistency with known symmetries, renormalizability, cosmological evolution, and precision tests of the Standard Model and general relativity.
The late physicist Joseph Polchinski once said the existence of magnetic monopoles is "one of the safest bets that one can make about physics not yet seen." In its quest for these particles, which have a magnetic charge and ...
General Physics
Apr 26, 2024
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For over a decade, the CMS Collaboration, a large team of researchers based at different institutes worldwide, has been analyzing data collected at the Compact Muon Solenoid, a general-purpose particle detector at CERN's ...
Scientists used a neural network, a type of brain-inspired machine learning algorithm, to sift through large volumes of particle collision data. Particle physicists are tasked with mining this massive and growing store of ...
General Physics
Apr 15, 2024
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The BESIII collaboration have reported the observation of an anomalous line shape around ppbar mass threshold in the J/ψ→γ3(π+π-) decay, which indicates the existence of a ppbar bound state. The paper was published online ...
General Physics
Apr 12, 2024
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Nobel prize-winning physicist Peter Higgs, who proposed the existence of the so-called "God particle" that helped explain how matter formed after the Big Bang, has died at age 94, the University of Edinburgh said Tuesday.
General Physics
Apr 9, 2024
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Operating at CERN's Large Hadron Collider (LHC) since 2022, the FASER experiment is designed to search for extremely weakly interacting particles. Such particles are predicted by many theories beyond the Standard Model that ...
General Physics
Apr 8, 2024
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Since the 1960s, scientists have discovered more than a dozen fundamental particles. They all have fit perfectly into the theoretical framework known as the Standard Model, the best description physicists have of the subatomic ...
General Physics
Feb 12, 2024
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The CMS experiment has presented its first search for new physics using data from Run 3 of the Large Hadron Collider. The new study looks at the possibility of "dark photon" production in the decay of Higgs bosons in the ...
General Physics
Dec 27, 2023
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