Tag

Standard Model

All articles tagged with #standard model

science2 days ago•159 min saved

CMS measures W boson mass with record precision at 13 TeV

CMS analyzed over 100 million W→μν decays from 2016 pp collisions at 13 TeV to extract mW using a highly granular, in-situ template fit of the muon pT, eta and charge distributions, aided by state-of-the-art NNLO+N3LL theory and data-driven PDFs; the result mW = 80,360.2 ± 9.9 MeV agrees with the Standard Model and helps address the prior CDF tension, with an additional W+ vs W− mass difference measurement of 57.0 ± 30.3 MeV. The analysis validates via Z-boson mass checks and a W-like mZ cross-check, and features robust muon momentum scale and hadronic recoil calibrations.

via Nature|

#cms-experiment #electroweak-precision #lhc

science2 months ago•16 min saved

Particle Physics at a Crossroads: Hard Questions, New Paths

More than a decade after the Higgs discovery, particle physics has yet to find new physics beyond the Standard Model, prompting a crisis about the field’s direction. Proposals for big next-gen machines (the Future Circular Collider, muon colliders) and smaller-scale tests (axions, hidden valleys) mingle with advances in AI-assisted data analysis, but there’s no discovery guarantee and talent is drifting toward other fields. In short, particle physics isn’t dead, but it’s hard—and the path forward remains uncertain.

via Quanta Magazine|

#artificial-intelligence #future-collider #lhc

science3 months ago•15 min saved

Standard Model Remains Unsolved as 2025 Closes

As 2025 concludes, the Standard Model of particle physics and cosmology remains robust despite numerous puzzles and challenges, with recent experiments reinforcing its predictions and no definitive evidence yet for physics beyond it. Key mysteries like dark matter, dark energy, and the matter-antimatter asymmetry persist, but current data strongly support the existing framework, emphasizing the need for continued investment in experimental and observational science to uncover deeper truths.

via Big Think|

#cosmology #dark-energy #dark-matter

science5 months ago•2 min saved

Revolutionary Model Reimagines the Universe's Origins Beyond Traditional Theories

A new model suggests that the universe's rapid early expansion, or inflation, occurred in a warm environment filled with known elementary particles, primarily involving the strong force and hypothetical axion-like particles, making it testable with current experiments like MADMAX.

via Phys.org|

#cosmic-inflation #early-universe #particle-physics

science5 months ago•0 min saved

Nobel Laureate Physicist Chen Ning Yang Passes Away at 103

Chen-ning Yang, a Nobel Prize-winning physicist renowned for his work on the Yang–Mills theory which is fundamental to the Standard Model of particle physics, has died at age 103 in Beijing.

via South China Morning Post|

#chen-ning-yang #nobel-prize #physicist

science8 months ago•4 min saved

Hidden Layers of Reality Beneath the Standard Model

Scientists are exploring the possibility of a hidden layer of reality called the 'zeptouniverse' at scales smaller than those currently accessible by the Large Hadron Collider, using indirect methods like studying rare particle decays, which could reveal new physics beyond the Standard Model within the next decade.

via Yahoo Home|

#cern #particle-decay #physics

science8 months ago•2 min saved

Scientists Uncover Clues Explaining Why Matter Dominates the Universe

Scientists from Shanghai Jiao Tong University have theorized that CP violation effects in charmed baryon decays could be much larger than previously thought, potentially providing new insights into why matter dominates antimatter in the universe. Their work emphasizes the role of final-state re-scattering and suggests that upcoming experiments, including China’s Super Tau-Charm Facility, could verify these predictions, advancing our understanding of fundamental physics.

via SciTechDaily|

#charmed-baryons #cp-violation #matter-antimatter-imbalance

science9 months ago•2 min saved

Scientists Edge Closer to Confirming a Fifth Force of Nature

Physicists have found potential evidence for a fifth fundamental force inside atoms, based on deviations in atomic transition measurements in calcium isotopes, which could suggest the existence of a new force mediated by a Yukawa particle, although further research is needed to confirm this discovery.

via ScienceAlert|

#atomic-transitions #atoms #fifth-force

science10 months ago•2 min saved

LHC Provides New Precise Measurement of Z Boson Mass

The LHCb experiment at the LHC has achieved a highly precise measurement of the Z boson mass, finding it to be approximately 91.184 GeV with an uncertainty of 9.5 MeV, aligning with previous measurements and the Standard Model prediction, paving the way for future high-precision studies at the LHC and beyond.

via Phys.org|

#large-hadron-collider #mass-measurement #particle-physics

science10 months ago•4 min saved

Physicists Resolve 20-Year Muon Magnetic Mystery with Advanced Technology

Fermilab's precise measurement of the muon's magnetic 'wiggle' aligns closely with the Standard Model, suggesting no new exotic physics is involved, though the muon's behavior continues to be a key probe for potential new particles or forces.

via sciencealert.com|

#fermilab #g-factor #muon

science10 months ago•14 min saved

Muon g-2 Experiment Resolves Long-Standing Magnetic Anomaly

The longstanding discrepancy between the theoretical and experimental values of the muon's magnetic moment (g-2) has been resolved, confirming the Standard Model's predictions and showcasing the importance of precise experiments and advanced computational methods like lattice QCD in understanding fundamental physics.

via Big Think|

#lattice-qcd #muon-g-2 #particle-physics

science10 months ago•8 min saved

Muon g-2 experiment achieves most precise magnetic anomaly measurement

Scientists at Fermilab have achieved the most precise measurement of the muon magnetic anomaly, confirming previous results with improved accuracy of 127 parts-per-billion, which provides a critical benchmark for testing the Standard Model and exploring potential new physics.

via Fermilab (.gov)|

#fermilab #magnetic-anomaly #muon-g-2

science10 months ago•4 min saved

Scientists Unveil Simplified Theory of Gravity That Challenges Einstein

Physicists propose a new, simpler approach to quantum gravity that reformulates gravity using four interrelated fields similar to those in quantum field theory, avoiding extra dimensions and additional particles, and aligning with known physics, though experimental verification remains challenging.

via Yahoo|

#general-relativity #new-theory #quantum-gravity

science1 year ago•4 min saved

New Insights Unveiled in Higgs Boson Research

Researchers at the Max Planck Institute have announced new findings on the Higgs boson, enhancing our understanding of its interactions with W and Z bosons, which are crucial to the Standard Model of particle physics. These discoveries, presented at the International Conference on High Energy Physics, confirm theoretical predictions and set the stage for future research at the High-Luminosity Large Hadron Collider. The findings not only validate existing theories but also open possibilities for discovering new particles or forces, potentially reshaping our understanding of the universe.

via Glass Almanac|

#higgs-boson #large-hadron-collider #max-planck-institute

science1 year ago•3 min saved

Quarks: The Next Frontier in Physics?

Physicists are investigating discrepancies in quark mixing predictions within the Standard Model, which currently do not sum to 100%, suggesting potential new physics. Researchers, including Jordy de Vries, have developed a new framework to more accurately calculate quark mixing, particularly between up and down quarks, using precise measurements from nuclear beta decays. This work aims to refine theoretical models and reduce uncertainties, potentially revealing new physics beyond the Standard Model.

via SciTechDaily|

#new-physics #nuclear-beta-decay #particle-physics