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Particle Physics Division


Institute of Research into the Fundamental Laws of the Universe
« The Particle Physics Division 
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!
Paris-Cluster qualified!
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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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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ATLAS: from photon collisions to axions
Heavy weights wedding
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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Nov 09, 2017
Do the two heavy weights of the Standard Model associate with each other?
The LHC's Atlas collaboration at Cern has observed a rare process: the production of Higgs bosons in association with a top quark and top antiquark pair. This work, supervised by an Irfu researcher, opens up perspectives on the study of the Higgs mechanism that gives mass to particles.
Do the two heavy weights of the Standard Model associate with each other?
Top quark at the LHC: no new physics in sight yet!
Oct 19, 2017
Top quark at the LHC: no new physics in sight yet!
Data collected at the LHC (Cern) were processed to provide the most accurate assessment of an asymmetry in top quark and top antiquark production. The result is that the measured value is compatible with the prediction of the standard particle model.
Aug 16, 2017
Playing Pool with Photons at the LHC
The ATLAS collaboration at CERN's LHC has found the first direct evidence for the rare process of high-energy light-by-light scattering, where two photons interact and change direction. This phenomenon was predicted several decades ago by quantum electrodynamics, i.e.
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Playing Pool with Photons at the LHC
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.
Feb 08, 2017
First Observation of Light-by-light Scattering at the LHC
Light-by-light scattering, predicted in 1936, was observed for the first time by the ATLAS experiment at the LHC, thanks to "ultra-peripheral" collisions of lead ions.
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First Observation of Light-by-light Scattering at the LHC

 

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