Physics News

Physicists Find Strong Evidence of Four-Top Quark Production

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.
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 is expected to occur only once for every 70,000 pairs of top quarks created at the Large Hadron Collider. 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...

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Cosmic rays striking Venus’ atmosphere eject neutrons that gradually fly into space. As neutrons move to higher altitudes, more time passes, and more neutrons radioactively decay. MESSENGER counted the number of neutrons seen at various altitudes, allowing researchers to home in on where neutron numbers start falling off. Using models, researchers can then estimate the neutron lifetime. Image credit: Johns Hopkins Applied Physics Laboratory.

NASA’s MESSENGER Mission Carries Out Space-Based Measurements of Neutron’s Lifetime

Jun 12, 2020 by News Staff

Using data acquired in 2007 and 2008 during flybys of Venus and Mercury by NASA’s MESSENGER spacecraft, researchers found the neutron lifetime to be...

View of a new phase of liquid crystal as seen under the microscope. Image credit: Chen et al, doi: 10.1073/pnas.2002290117.

Researchers Confirm Existence of Elusive Phase of Liquid Crystals

Jun 11, 2020 by News Staff

A team of scientists from the University of Colorado Boulder and the University of Utah has confirmed the existence of a ferroelectric nematic phase of...

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...

The precision measurements of tritium and helium-3 nuclei reveal new questions in understanding of nuclear structure. Image credit: DOE’s Jefferson Lab.

Experiments with Tritium and Helium-3 Reveal New Questions in Understanding of Nuclear Structure

Jun 9, 2020 by News Staff

Physicists from the Jefferson Lab Hall A Tritium Collaboration have compared the nuclei of helium and hydrogen isotopes to each other to get a clearer...

Neutron Star Cores May Contain Exotic Quark Matter

Jun 2, 2020 by News Staff

Massive neutron stars have sizable quark-matter cores, according to a study published in the journal Nature Physics. An artist’s conception of a massive...

Experimental apparatus used to synthesize pionic helium atoms at the Paul Scherrer Institute. Image credit: ASACUSA Collaboration, CERN.

CERN Physicists Create Atoms of Pionic Helium

May 13, 2020 by News Staff

Physicists from the ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) Collaboration at CERN have successfully synthesized and studied...

An illustration of a quantum radar prototype. Image credit: Philip Krantz / Institute of Science and Technology Austria.

Researchers Create Prototype of Microwave Quantum Radar

May 12, 2020 by News Staff

A team of researchers from Austria, the U.S., the UK, and Italy has demonstrated a new technology called microwave quantum illumination that uses entangled...

This artist’s impression shows how ULAS J1120+0641, a very distant quasar powered by a black hole with a mass two billion times that of the Sun, may have looked. Image credit: M. Kornmesser / ESO.

New Measurements of Fine-Structure Constant Suggest Laws of Nature Not as Constant as Previously Thought

Apr 29, 2020 by News Staff

The fine-structure constant is a measure of electromagnetism — one of the four fundamental forces in nature; the others are gravity, weak nuclear...

Metasurface laser produces super-chiral light with orbital angular momentum up to 100. Image credit: University of the Witwatersrand.

Newly-Developed Metasurface-Enhanced Laser Emits Super-Chiral Light

Apr 28, 2020 by News Staff

A team of scientists from the University of the Witwatersrand, Harvard University and the National University of Singapore has come up with a new metasurface-enhanced...

Majorana quasiparticles on the surface of uranium ditelluride. Image credit: E. Edwards, Illinois Quantum Information Science and Technology Center.

New Measurements Show Evidence for Presence of Majorana Quasiparticles in Uranium Ditelluride

Apr 7, 2020 by News Staff

An international team of physicists has used high-resolution microscopy tools to peer at the inner-workings of the recently-discovered heavy-fermion superconductor,...

The new flat lens could drastically reduce the weight, complexity and cost of cameras and other imaging systems, while increasing their functionality. Image credit: Rajesh Menon, University of Utah.

Scientists Develop Focus-Free Camera with Flat Lens

Mar 18, 2020 by News Staff

A team of researchers from the University of Utah, Salt Lake City, and Oblate Optics, Inc. has created a camera that does not require focusing. The new...

A simulation of the large-scale structure of the Universe with filaments of dark matter in blue and places of galaxy formation in yellow. Image credit: Zarija Lukic / Lawrence Berkeley National Laboratory.

New Candidate Particle for Dark Matter: D-Star Hexaquark

Mar 4, 2020 by Enrico de Lazaro

Dark matter is the mysterious substance that makes up roughly a quarter of the Universe. There is strong indirect evidence for its existence from measurements...

Abel et al present the result of an experiment to measure the electric dipole moment of the neutron at the Paul Scherrer Institute using Ramsey’s method of separated oscillating magnetic fields with ultracold neutrons. Image credit: Gerd Altmann.

Physicists Precisely Measure Electric Dipole Moment of Neutron

Mar 2, 2020 by News Staff

In a paper in the journal Physical Review Letters, an international team of physicists reports the most precise measurement ever made of the electric dipole...

Artist’s impression of a cloud of trapped antihydrogen atoms. Image credit: Chukman So.

CERN Physicists Measure Quantum Effects in Energy Structure of Antihydrogen

Feb 28, 2020 by News Staff

In 1947, American physicist Willis Lamb and his colleagues observed an incredibly small shift in the energy levels of the hydrogen atom as the atom’s...

Physicists Probe Core of Strong Nuclear Interaction between Protons and Neutrons

Feb 27, 2020 by News Staff

The strong force is one of the four fundamental forces of nature, which also include gravity, electromagnetism and the weak nuclear force. The strong force...

Laser-cooled atom cloud viewed through microscope camera. Image credit: University of Otago.

Physicists Observe Three-Atom Collisions in Ground-Breaking Experiments

Feb 24, 2020 by News Staff

A team of physicists in New Zealand has held individual atoms of rubidium in place and observed previously unseen interactions. Laser-cooled atom cloud...

Electrons travel in cars with increasing numbers, giving rise to a conductance series that shows up in Pascal’s triangle. Image credit: Yun-Yi Pai.

Scientists Discover New Electronic State of Matter

Feb 19, 2020 by News Staff

A team of U.S. physicists and materials scientists has observed a new state of matter at the interface between two oxide materials: lanthanum aluminate...

An artist’s impression of the dissolving of the electronic ‘traffic jam:’ the red atoms are different in their quantum nature and allow transport of electrons in their surroundings. Image credit: Berend Zwartsenberg.

Physicists Pioneer New Way to Turn Metal into Insulator

Feb 14, 2020 by News Staff

A team of physicists led by the University of British Columbia has demonstrated a novel way to precisely control electrical currents by leveraging the...

Two electrons and two holes, created by light quanta, held together by a chessboard-like background. Image credit: TU Wien

Physicists Discover New Quasiparticle

Feb 5, 2020 by News Staff

Named π-ton (pi-ton), the newly-discovered quasiparticle consists of two electrons and two holes. Two electrons and two holes, created by light quanta,...

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