Tag Archive for 'ATLAS'

The discovery image of 3I/ATLAS from the ATLAS telescope. Image credit: University of Hawai’i.

Astronomers Track Interstellar Comet 3I/ATLAS

Jul 4, 2025 by News Staff

3I/ATLAS is only the third object of its kind ever observed, following the interstellar asteroid 1I/ʻOumuamua in 2017 and the interstellar comet 2I/Borisov...

A three-vector-boson event recorded by ATLAS, with one W boson decaying to an electron and a neutrino, one W boson decaying to a muon and a neutrino, and a Z boson decaying to two muons; muons are shown by red lines, the electron by a green line, and ‘missing energy’ from the neutrino by a dashed white line. Image credit: ATLAS / CERN.

CERN Physicists Observe Production of Weak Boson Triplets

Feb 27, 2025 by News Staff

Physicists with the ATLAS Collaboration at CERN’s Large Hadron Collider have announced the first observation of VVZ production — a rare combination...

Display of a lead-lead collision at 5.02 TeV per nucleon pair that resulted in a candidate pair of top quarks that decay into other particles. The event contains four particle jets (yellow cones), one electron (green line) and one muon (red line). The inlay shows an axial view of the event. Image credit: ATLAS / CERN.

CERN Physicists Observe Top-Quark Pairs in Lead-Lead Collisions

Nov 19, 2024 by News Staff

Top-quark pair production has been observed in lead-lead collisions at CERN’s Large Hadron Collider (LHC) with the ATLAS detector, marking the first...

An event display of a di-Higgs candidate event taken in 2017. Image credit: ATLAS Collaboration / CERN.

CERN Physicists Searching for Production of Elusive Higgs-Boson Pairs

Jun 25, 2024 by News Staff

Physicists from the ATLAS Collaboration at CERN’s Large Hadron Collider (LHC) have released the most sensitive search for di-Higgs production and self-coupling...

View of an ATLAS collision event in which a candidate W boson decays into a muon and a neutrino; the reconstructed tracks of the charged particles in the inner part of the ATLAS detector are shown as orange lines; the energy deposits in the detector’s calorimeters are shown as yellow boxes; the identified muon is shown as a red line; the missing transverse momentum associated with the neutrino is shown as a green dashed line. Image credit: ATLAS / CERN.

CERN Physicists Measure Width of W Boson

Apr 11, 2024 by News Staff

Physicists from the ATLAS Collaboration have measured the width of the W boson — the electrically charged carrier of the weak force — at CERN’s...

Candidate Higgs boson decays into two photons in the ATLAS experiment. Image credit: CERN.

CERN Physicists Measure Higgs Boson’s Mass with Unprecedented Precision

Aug 1, 2023 by News Staff

In the eleven years since its discovery, studies of the Higgs boson have become a central avenue for shedding light on the fundamental structure of the...

Event display of a candidate H→ Zγ event with the Z boson decaying μ+μ-. The transverse momenta of the two muon candidates, shown in red, are 72 GeV and 20 GeV. The photon candidate is reconstructed as an unconverted photon with a transverse momentum of 32.5 GeV. Two jets (R=0.4) are represented by light blue cones, with mjj of 965 GeV. The green boxes correspond to energy deposits in cells of the electromagnetic calorimeter, while yellow boxes correspond to energy deposits in cells of the hadronic calorimeter. The invariant mass of the Z boson candidate is 91.1 GeV and the invariant mass of Zγ system is 125.4 GeV. Image credit: ATLAS Collaboration / CERN.

CERN Physicists Find First Evidence for Rare Decay of Higgs Boson

May 29, 2023 by News Staff

Physicists from the ATLAS and CMS collaborations at CERN’s Large Hadron Collider (LHC) have independently conducted extensive searches for the rare Higgs...

ATLAS candidate event for a Higgs boson decaying into two Z bosons that in turn decay into two muons and two electrons. Image credit: CERN.

ATLAS Physicists Measure Decay Width of Higgs Boson

Nov 29, 2022 by News Staff

Physicists from the ATLAS Collaboration at CERN’s Large Hadron Collider (LHC) have performed new measurements of Higgs boson’s decay width, which is...

In 2012, physicists from the ATLAS and CMS experiments at CERN announced the discovery of a new boson looking very much like the Higgs boson. Image credit: Daniel Dominguez / CERN.

CERN Physicists Release Most Up-To-Date Results on Higgs Boson’s Properties

Jul 4, 2022 by News Staff

On July 4, 2012, physicists from the ATLAS and CMS collaborations at CERN’s Large Hadron Collider announced the observation of a Higgs boson at a mass...

ATLAS (left) and CMS (right) candidate events for a Higgs boson decaying into a pair of tau leptons. Image credit: CERN.

Physicists Search for Matter-Antimatter Asymmetry in Higgs Boson-Tau Lepton Interactions

Jun 27, 2022 by News Staff

Symmetries make the world go round, but so do asymmetries. A case in point is an asymmetry known as charge-parity asymmetry, which is required to explain...

These images show the main-belt comet (248370) 2005 QN137. Image credit: Hsieh et al., arXiv: 109.14822.

Astronomers Spot Comet in Solar System’s Main Asteroid Belt

Oct 5, 2021 by News Staff

(248370) 2005 QN137 is the eighth main-belt asteroid, out of more than half a million asteroids in the main belt, confirmed to not only be active, but...

Display of a candidate WWW→ 3 leptons + neutrinos event; the event is identified by its decay to a muon (red line), two electrons (blue lines) and missing transverse energy (white dashed line). Image credit: CERN.

CERN Physicists Observe Triple W-Boson Production

Jul 27, 2021 by News Staff

Physicists from the ATLAS Collaboration at CERN’s Large Hadron Collider (LHC) have observed a process called WWW production: the simultaneous creation...

CERN Physicists Test ‘Lepton Flavor Universality’

Jul 6, 2021 by News Staff

Physicists from the ATLAS Collaboration at CERN’s Large Hadron Collider (LHC) have successfully performed measurements of ‘lepton flavor universality,’...

Higgs boson candidates decaying to a dilepton pair and a photon. Image credit: ATLAS Collaboration / CERN.

CERN Physicists Find Evidence for Rare Decay of Higgs Boson

Feb 10, 2021 by News Staff

Physicists from the ATLAS (A Toroidal LHC ApparatuS) Collaboration at CERN’s Large Hadron Collider (LHC) have found first evidence of the Higgs boson...

A 2018 ATLAS event display consistent with the production of a pair of W bosons from two photons, where the W bosons decay into a muon and an electron (visible in the detector) and neutrinos (not detected). The muon path (red line) and electron path (yellow line) are shown. The electron deposits its energy in the electromagnetic calorimeter (yellow blocks). The many particles reconstructed in the Inner Detector are shown in orange. Top left corner shows that these particles do not originate from the same interaction and are thus attributed to additional proton-proton interactions. Image credit: ATLAS Collaboration / CERN.

Photon Collisions Produce Pairs of Weak-Force Carriers

Aug 11, 2020 by News Staff

Physicists from the ATLAS (A Toroidal LHC ApparatuS) Collaboration at CERN’s Large Hadron Collider have observed production of W bosons, elementary particles...

Candidate event displays of a Higgs boson decaying into two muons as recorded by CMS (left) and ATLAS (right). Image credit: CERN.

Higgs Boson Seen Decaying to Two Muons

Aug 6, 2020 by News Staff

Physicists from the ATLAS (A Toroidal LHC ApparatuS) and CMS (Compact-Muon-Solenoid) collaborations at CERN’s Large Hadron Collider have reported strong...

Event display of a candidate four-top-quark event, where two of the top quarks decay leptonically -- one with a resulting muon (red) and one with an electron (green) -- and two top quarks decay hadronically (green and yellow rectangles). The jets -- b-tagged jets -- are shown as yellow (blue) cones. Image credit: ATLAS Collaboration / CERN.

Physicists Find Strong Evidence of Four-Top Quark Production

Jun 18, 2020 by News Staff

Physicists from the ATLAS Collaboration CERN’s Large Hadron Collider have uncovered strong evidence of the production of four top quarks. This rare process...

Collision event recorded by ATLAS. Image credit: CERN.

CERN Physicists Search for Rare Decays of Higgs Boson

Jun 10, 2020 by News Staff

Physicists from CERN’s ATLAS (A Toroidal LHC ApparatuS) and CMS (Compact-Muon-Solenoid) collaborations presented their latest results at the 2020 Large...

This image shows the Jupiter trojan asteroid 2019 LD2. Image credit: ATLAS.

Astronomers Spot First Trojan Asteroid with Comet-Like Tail: 2019 LD2

May 22, 2020 by News Staff

2019 LD2 is the first known Jupiter trojan asteroid to display cometary activity with a visible coma and tail, according to a team of astronomers from...

During super-close flybys of Saturn’s rings, Cassini inspected the mini-moons Pan and Daphnis in the A ring; Atlas at the edge of the A ring; Pandora at the edge of the F ring; and Epimetheus, which is bathed in material that fans out from the moon Enceladus. Image credit: NASA-JPL / Caltech.

Saturn’s Rings Coat Its Small Inner Moons, Cassini Researchers Say

Mar 29, 2019 by News Staff

Saturn’s main ring system is associated with a set of moons (Pan, Daphnis, Atlas, Pandora, and Epimetheus) that are either embedded within it, or interact...