Compact Muon Solenoid

Physicists report the first observations of quantum entanglement in quarks, the heaviest known fundamental particles, inside the Large Hadron Collider

After an unexpected measurement by the Collider Detector at Fermilab (CDF) experiment in 2022, physicists on the Compact Muon Solenoid experiment (CMS) at the Large Hadron Collider (LHC) announced today a new mass measurement of the W boson, one of nature's force-carrying particles.

In the early morning of 13 September, the LHC reached a significant milestone, surpassing 100 fb-1 of integrated luminosity delivered to ATLAS and CMS in a single year—a record—and the figure is still rising. Then, LHCb's integrated luminosity target of 8.5 fb-1 was reached one day later.

Quantum entanglement in top quarks has been demonstrated, according to the results of a groundbreaking experiment by physicists at CERN.

8 basic unanswered questions about the known particles. It's 2024, and we still only know of the fundamental particles of the Standard Model: nothing more. But these 8 unanswered questions….

Particle physicists have detected a novel decay of the Higgs boson for the first time, revealing a slight discrepancy in the predictions of the Standard Model and perhaps pointing to new physics beyond it. The findings are published in the journal Physical Review Letters.

Particles are being collided in the hopes of finding something related to dark matter.

The IceCube Neutrino Observatory, operated by the University of Wisconsin-Madison (UW-M), located at the Amundsen–Scott South Pole Station in Antarctica, is one of the most ambitious neutrino observatories in the world. Behind this observatory is the IceCube Collaboration, an international group of 300 physicists from 59 institutions in 14 countries.

Aurélien Barrau reviews the recent disappointing results from the Large Hadron Collider. Without any sign of new physics, without any confirmation of popular theories such as supersymmetry, the field needs to be fundamentally reconsidered.

Collider experiments have set new direct limits on the existence of hypothetical heavy neutrinos, helping to constrain how ordinary neutrinos get their mass.

The discovery of the Higgs boson at CERN's Large Hadron Collider (LHC) in 2012 marked a significant milestone in particle physics. Since then, the ATLAS and CMS collaborations have been diligently investigating the properties of this unique particle and searching to establish the different ways in which it is produced and decays into other particles.

On Friday, November 18, a test using collisions of lead ions was carried out in the Large Hadron Collider (LHC) and provided an opportunity for the experiments to validate the new detectors and new data-processing systems ahead of next year's lead-lead physics run.

Russia's invasion of Ukraine is damaging international scientific cooperation.

The famed particle-smasher reignited after years of technology upgrades.

The Large Hadron Collider is once again delivering proton collisions to experiments, this time at an unprecedented energy of 13.6 TeV, marking the start of the accelerator's third run of data taking for physics. A burst of applause erupted in the CERN Control Center on July 5, 2022, at 4.47 p.m. CE

A new period of data taking begins on Tuesday, 5 July for the experiments at the world's most powerful particle accelerator, the Large Hadron Collider (LHC), after more than three years of upgrade and maintenance work. Beams have already been circulating in CERN's accelerator complex since April, with the LHC machine and its injectors being recommissioned to operate with new higher-intensity beams and increased…

Quark-gluon plasma (QGP) is a state of matter existing at extremely temperatures and densities, such as those that occur in collisions of hadrons (protons, neutrons and mesons). Under so-called "normal" conditions, quarks and gluons are always confined in the structures that constitute hadrons, but when hadrons are accelerated to relativistic velocities and made to collide with each other, as they are in the…

Long-awaited boosts to the world's most powerful collider could spur breakthroughs in the hunt for physics beyond the Standard Model

The standard model of particle physics has stood the test of time for decades, but now a new measurement of a particle called the W boson could indicate a chink in its armour

Physicists with the CMS Collaboration have released its latest search for the production of Higgs boson pairs, known as di-Higgs, and provided constraints on their production rate.