project
General-purpose particle detector experiment at CERN's Large Hadron Collider, studying high-energy particle collisions including Higgs boson physics.
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CMS combined 138 fb-1 of 2016-2018 collision data and measured a Higgs signal strength of 1.01 +/- 0.05, against a Standard Model value of 1. Any new physics that alters the Higgs rate now has room mainly near or below that 5 percent precision.
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CERN crews have begun dismantling the LHC around ATLAS and CMS to swap its focusing magnets for niobium-tin ones about 40% stronger. The first replacement quadrupole is not due in the tunnel until the start of 2029.
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A search of LHC collision data for microscopic quantum black holes found none. The exclusion limit that follows is the publishable result. Where that limit sits decides whether theorists have to move.
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The LHC spent part of July 2025 colliding protons with oxygen nuclei to imitate a cosmic ray hitting air, and ATLAS's measurement is now finer than the disagreements among the seven codes used to model showers.
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Tamas Vami and Danyi Zhang looked through CMS data for microscopic black holes, found none, and published the bound. They also describe the search itself as a new way to look for new particles.
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The elliptic signal says neon-20 is not spherical. The triangular signal runs the wrong way, and no number for the deformation survives that disagreement.
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A Michigan-led ATLAS analysis claims world-best sensitivity to the Higgs boson interacting with itself, using machine learning on data already in hand, four years before the LHC upgrade.
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