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Particle Physics Division


Institute of Research into the Fundamental Laws of the Universe
« Projects
ATLAS observes for the first time the production of 4 top quarks
Mar 24, 2023
ATLAS observes for the first time the production of 4 top quarks
The ATLAS collaboration announced at the Moriond conference the observation of simultaneous production of four top quarks. This is one of the rarest and heaviest processes ever observed at the Large Hadron Collider (LHC).
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Jun 28, 2021
ATLAS giants on their way to CERN!
As part of the luminosity increase of the Large Hadron Collider (LHC), the first phase of the ATLAS experiment upgrade is coming to an end, before a restart planned for early 2022.
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ATLAS giants on their way to CERN!
ATLAS muon spectrometer alignment
Apr 15, 2021
ATLAS muon spectrometer alignment
The muon spectrometer of the ATLAS experiment has been an important contribution of IRFU since the design, and IRFU is still in charge of the alignment today.
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Mar 10, 2021
Paris-Cluster qualified!
The ATLAS detector equipped with a new charged particle tracking device for the HL-LHC.
The high luminosity phase of the LHC (HL-LHC) should enable the collection of a dataset unprecedented in the history of particle physics. In order to record these data, the Atlas detector will undergo a major upgrade.
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Paris-Cluster qualified!
ATLAS: from photon collisions to axions
Aug 03, 2020
ATLAS: from photon collisions to axions
Photon-photon elastic scattering is a very rare phenomenon in which two real photons interact producing a new real photon pair. The direct observation of this process at high energy, impossible during decades, was done by ATLAS [1] and CMS [2] experiment at CERN between 2016 and 2019.
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Jun 19, 2018
Heavy weights wedding
The ATLAS and CMS collaborations, involving teams from CEA/IRFU and CNRS/IN2P3, announced on 4 June 2018 at the LHCP conference the direct observation of the coupling of the quark top to the Higgs boson.
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Heavy weights wedding
ATLAS Experiment at LHC: the Higgs Boson, Still Unique
Jul 07, 2017
ATLAS Experiment at LHC: the Higgs Boson, Still Unique
Physicists from IRFU have announced that no "big brother" of the Higgs boson has been detected at the ATLAS experiment at CERN's LHC. Their results rely on new analyzes with higher sensitivity.
Mar 18, 2015
Union autour du boson de Higgs
Les collaborations ATLAS et CMS ont présenté pour la première fois leur mesure combinée de la masse du boson de Higgs, parvenant à une mesure précise à 0,2% près.
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Union autour du boson de Higgs
The LHC climbs the Palace steps
Aug 05, 2010
The LHC climbs the Palace steps
Paris was the first to hear about the LHC's initial physics results
The 35th International Conference on High-Energy Physics was held at the Palais des Congrès in Paris from 22 to 28 July—an opportunity for the LHC teams to present their first results.
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Dec 23, 2009
The beautiful awakening of the giant ATLAS
Since the accident which occurred on the LHC accelerator several days after its commissioning in 2008, the ATLAS collaboration has been impatient to observe "true" events produced at the centre of the detector, and to make the equipment function under real conditions.
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The beautiful awakening of the giant ATLAS

 

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