CMS

New ATLAS and CMS searches close the gap for compressed higgsinos

Supersymmetry plays a prominent role in the landscape of models that push beyond the Standard Model. Higgsinos, the supersymmetric partners of the Higgs boson, may help in addressing a number of unsolved puzzles, particularly if their masses are…

Light ions bring CMS closer to the onset of QGP-like behaviour

What are the smallest droplets of strongly interacting matter that exhibit colour deconfinement? This question has become one of the most intriguing frontiers in heavy-ion physics. At very high temperatures and densities, quantum chromodynamics…

AI for Gravitational Waves: Building Bridges Between Scientific Communities

As gravitational-wave observatories enter a new phase of sensitivity, scale and scientific ambition, the challenge is no longer only to detect faint ripples in spacetime. It is also to analyse, interpret and respond to them fast enough to open new…

Rucio crosses the exabyte horizon

When we last wrote in these pages about Rucio, ATLAS had just passed the half-exabyte mark and the community counted around thirty organisations. Six years on, a threshold that was then a distant projection has been crossed: both ATLAS and CMS…

Towards monitoring in Run 4 and beyond: LHC experiments exchange perspectives on data quality at the HL-LHC

In March of 2026, experts from ALICE, ATLAS, CMS and LHCb gathered at CERN for a dedicated workshop on Data Quality Monitoring (DQM), bringing together developers, coordinators and detector specialists to discuss how the LHC experiments monitor the…

Out of the loop: CMS advances in the search for a rare Higgs boson decay

Completing the Higgs boson’s profile requires probing some of its rarest decay modes. Among the few still awaiting observation is the decay into a Z boson and a photon (H → Zγ), which occurs in only about one out of every ten thousand Higgs boson…

From particle flow to learned reconstruction at CMS

An interactive version of the above event display can be found on this page. For more than a decade, particle-flow reconstruction has been at the core of CMS event interpretation. It was instrumental in the discovery of the Higgs…

First HGCAL absorber structure delivered to CERN for assembly

After an eight-week journey, the first HGCAL absorber structure (CE-H1) was delivered to CERN and is ready to be assembled, just 100 metres above the location where the detector will eventually be installed. Seventeen enormous boxes were delivered…

Dark Showers at the LHC: from benchmarks to Run-3 readiness

The search for new physics at the LHC increasingly pushes beyond traditional signatures. Among the most intriguing possibilities are dark showers—complex cascades of particles emerging from dark-sector dynamics, capable of producing rich,…

Triple Higgs Frontiers: Mapping the Higgs self-couplings at the 2025 HHH workshop

More than a decade after the discovery of the Higgs boson, attention is shifting from finding the Higgs to mapping its self-interactions. These self-couplings determine the shape of the Higgs potential, and with it the stability of our vacuum and…

Subscribe to CMS