Tag Archive for 'Top quark'

Installation of the CMS beam pipe. Image credit: CERN / CMS Collaboration.

CERN Physicists Search for Violation of Lorentz Symmetry in Top-Quark Pair Production

Jan 27, 2025 by News Staff

Physicists with the CMS Collaboration at CERN’s Large Hadron Collider have tested whether top quarks adhere to Albert Einstein’s special theory of...

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...

The classical signature of a top-quark pair produced in LHC collisions is four jets (yellow cones), one muon (red line, also detected by the CMS muon detectors as red boxes), and missing energy from a neutrino (pink arrow). Image credit: CERN.

CERN Physicists Measure Mass of Top Quark

Apr 20, 2022 by News Staff

Physicists from the CMS (Compact Muon Solenoid) Collaboration at CERN’s Large Hadron Collider (LHC) have substantially improved the precision with which...

CMS candidate event for a top quark and antitop quark producing an electron, a muon and jets originating from bottom (b) quarks. Image credit: CERN.

CERN Physicists Find First Evidence for Production of Top Quarks in Nucleus-Nucleus Collisions

Nov 16, 2020 by News Staff

New results from the CMS Collaboration at CERN’s Large Hadron Collider demonstrate for the first time that top quarks are produced in nucleus-nucleus...

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...

Visualization of a data event from the tt¯H(γγ) Had BDT bin with the largest signal over background ratio; the event contains two photon candidates, with a diphoton mass of 125.4 GeV; in addition, six jets are reconstructed using the anti-kt algorithm and R = 0.4, including one jet that is b-tagged using a 77% efficiency working point; the photons correspond to the green towers in the electromagnetic calorimeter, while the jets (b-jets) are shown as yellow (blue) cones. Image credit: ATLAS Collaboration.

Physicists Observe Simultaneous Production of Higgs Boson with Top Quark-Antiquark Pair

Jun 8, 2018 by News Staff

In July 2012, ATLAS (A Toroidal LHC ApparatuS) and CMS (Compact-Muon-Solenoid) experiments at CERN’s Large Hadron Collider jointly announced the discovery...