Studying “Little Bangs”: exotic collisions probe the size of quark-gluon plasma
Physics Briefing | 13 July 2021
The hunt for higgsinos reaches new limits
Physics Briefing | 10 June 2021
Heavyweight champions: a search for new heavy W’ bosons with the ATLAS detector
Physics Briefing | 9 June 2021
ATLAS measures the polarisation of top quarks and antiquarks
Physics Briefing | 8 June 2021
New search for charming decay of the Higgs boson
Physics Briefing | 7 June 2021
Twice the Higgs, twice the challenge
Physics Briefing | 29 March 2021
ATLAS finds further confirmation of evidence for four top quark process
Physics Briefing | 24 March 2021
Better late than never: ATLAS searches for late-decaying new particles
Physics Briefing | 23 March 2021
Deeper insight into Higgs boson production using W bosons
Physics Briefing | 22 March 2021
The supersymmetric bottom quark and its friends
Physics Briefing | 16 March 2021
Studying top quarks at high and not-so-high energies
Physics Briefing | 11 March 2021
The power of position: aligning the ATLAS muon spectrometer
Experiment Briefing | 4 March 2021
ATLAS finds evidence of a rare Higgs boson Dalitz decay to two leptons and a photon
Physics Briefing | 2 February 2021
Studying the Higgs boson in its most common – yet uncommonly challenging – decay channel
Physics Briefing | 1 December 2020
Refining the picture of the Higgs boson
A new result from the ATLAS Collaboration, released for the Higgs 2020 conference, aims at enriching the Higgs picture by studying its WW* decays.
Physics Briefing | 19 November 2020
ATLAS uses the Higgs boson as a tool to search for Dark Matter
One of the great unexplained mysteries is the nature of dark matter. So far, its existence has only been established through gravitational effects observed in space; no dark-matter particles with the needed properties have (yet) been detected. Could the Higgs boson be the key to their discovery?
Physics Briefing | 29 October 2020
Higgs boson probes for new phenomena
ATLAS scientists are implementing a new strategy in the search for physics beyond the Standard Model – one that combines measurements across the full spectrum of the Collaboration's research programme.
Physics Briefing | 28 October 2020
Leptons at a distance: a new search for long-lived particles
ATLAS researchers are broadening their extensive search programme to look for more unusual signatures of unknown physics, such as long-lived particles. A theory that naturally motivates long-lived particles is supersymmetry (SUSY). A new search from the ATLAS Collaboration – released this week for the 5th International Conference on Particle Physics and Astrophysics (ICPPA-2020) – looks for the superpartners of the electron, muon and tau lepton
Physics Briefing | 7 October 2020
Z bosons zoom through quark–gluon plasma as jets quench
With new data from the LHC, ATLAS physicists have measured jet-quenching phenomena in the quark–gluon plasma with help of Z bosons.
Physics Briefing | 25 August 2020
ATLAS observes W-boson pair production from light colliding with light
The ATLAS Collaboration has announced the first observation of two W bosons produced from the scattering of two photons — particles of light – at the International Conference on High-Energy Physics (ICHEP 2020).
Physics Briefing | 5 August 2020
New ATLAS result marks milestone in the test of Standard Model properties
The ATLAS Collaboration has released a new study into a key building block of matter: leptons. This type of particle comes in three different families (flavours) and, according to the Standard Model, should follow strict rules. For instance, except for their mass, leptons of different flavours have identical properties – a feature known as lepton flavour universality. This was recently corroborated by a key measurement of the W-boson decay rates into leptons by the ATLAS Collaboration.
Physics Briefing | 3 August 2020
New measurements of the Higgs boson find strength in unity
Physicists can study Higgs-boson couplings in several ways: by measuring the rates of different Higgs boson production mechanisms and decays, and also by studying the particle’s kinematic properties. The ATLAS Collaboration has just presented precise new measurements of these key quantities. Several of these measurements were updated to use the full LHC Run 2 dataset (2015–2018), to provide the best precision to date.
Physics Briefing | 31 July 2020
Looking forward: ATLAS measures proton scattering when light turns into matter
Today, at the International Conference for High Energy Physics (ICHEP 2020), the ATLAS Collaboration announced first results using the ATLAS Forward Proton (AFP) spectrometer. With this instrument, physicists directly observed and measured the long sought-after prediction of proton scattering when particles of light turn into matter.
Physics Briefing | 30 July 2020
ATLAS probes interactions between heavyweights of the Standard Model
In the contest for the heaviest known elementary particle, the top quark and Z boson rank first and third, respectively. When a proton–proton collision produces a top-quark pair together with a Z boson – a process known as ttZ production – their total mass can reach an impressive 440 GeV! The discovery of this highly energetic process thus required the record collision energy and rate of the LHC; no previous collider could come close.
Physics Briefing | 30 July 2020
Jetting into the dark side: a precision search for dark matter
The nature of dark matter remains one of the great unsolved puzzles of fundamental physics. Many theoretical scenarios postulate that dark matter particles could be produced in the intense high-energy proton–proton collisions of the LHC. While the dark matter would escape the ATLAS detector unseen, it could occasionally be accompanied by a visible jet of particles radiated from the interaction point. Today, at the International Conference in High-Energy Physics (ICHEP 2020), ATLAS presented a new search for novel phenomena in collision events with jets and high missing transverse momentum (MET).
Physics Briefing | 27 July 2020