CERN

CERN

LHC experiments at CERN observe quantum entanglement at the highest energy yet

In an article published today in Nature, the ATLAS collaboration reports how it succeeded in observing quantum entanglement at the LHC for the first time.

18 September 2024

ATLAS measures strength of the strong force with record precision

The result showcases the power of the LHC to push the precision frontier and improve our understanding of nature.

25 September 2023

ATLAS sets record precision on Higgs boson’s mass

The new result is the most precise determination of the Higgs-boson mass yet, achieving a remarkable accuracy of 0.09% for this fundamental parameter.

21 July 2023

LHC experiments see first evidence of a rare Higgs boson decay

ATLAS and CMS teamed up to find the first evidence of the rare process in which the Higgs boson decays into a Z boson, the electrically neutral carrier of the weak force, and a photon, the carrier of the electromagnetic force.

26 May 2023

Improved ATLAS result weighs in on the W boson

The new ATLAS measurement concurs with, and is more precise than, all previous W mass measurements except one – the latest measurement from the CDF experiment at the Tevatron, a former accelerator at Fermilab.

22 March 2023

LHC Run 3: physics at record energy starts tomorrow

The Large Hadron Collider is ready to once again start 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.

4 July 2022

ATLAS and CMS release results of most comprehensive studies yet of Higgs boson’s properties

The collaborations have used the largest samples of proton–proton collision data recorded so far by the experiments to study the unique particle in unprecedented detail.

4 July 2022

Rare phenomenon observed by ATLAS features the LHC as a high-energy photon collider

During the International Conference on High-Energy Physics (ICHEP 2020), the ATLAS Collaboration presented the first observation of photon collisions producing pairs of W bosons, elementary particles that carry the weak force, one of the four fundamental forces. The result demonstrates a new way of using the LHC, namely as a high-energy photon collider directly probing electroweak interactions. It confirms one of the main predictions of electroweak theory – that force carriers can interact with themselves – and provides new ways to probe it.

5 August 2020

CERN experiments announce first indications of a rare Higgs boson process

The ATLAS and CMS experiments at CERN announce new results which show that the Higgs boson decays into two muons. These new results have pivotal importance for fundamental physics because they indicate for the first time that the Higgs boson interacts with second-generation elementary particles.

3 August 2020

First high-precision measurement of the mass of the W boson at the LHC

In a paper published today in the European Physical Journal C, the ATLAS Collaboration reports the first high-precision measurement at the Large Hadron Collider (LHC) of the mass of the W boson. This is one of two elementary particles that mediate the weak interaction – one of the forces that govern the behaviour of matter in our universe. The reported result gives a value of 80370±19 MeV for the W mass, which is consistent with the expectation from the Standard Model of Particle Physics, the theory that describes known particles and their interactions.

12 February 2018

LHC experiments join forces to zoom in on the Higgs boson

Today during the 50th session of “Rencontres de Moriond” in La Thuile Italy, ATLAS and CMS presented for the first time a combination of their results on the mass of the Higgs boson.

17 March 2015