Browse Physics

The first results from the space-borne Alpha Magnetic Spectrometer confirm an unexplained excess of high-energy positrons in Earth-bound cosmic rays.

The IceCube neutrino telescope reports its most extensive search for neutrinos produced by dark matter annihilations in the Sun.

The ATRAP Collaboration has measured the magnetic moment of the antiproton more precisely than ever before, allowing a new test of $CPT$ symmetry.

New search for hypothetical particle focuses on old rocks where monopole abundance should be higher.

$D$-mesons are the fourth in a quartet of neutral mesons to be observed oscillating into their antiparticle partners.

The particle thought to be the Higgs boson seems likely to pass an important identity check.

Microparticles suspended in an optical cavity may be a new way to detect gravity waves.

Much can be learned about hypothetical particles called axions by studying the evolution of massive stars.

The H.E.S.S. Collaboration has put bounds on the flux of very-high-energy gamma rays that could be produced by annihilations of dark matter particles.

Invisible sheetlike structures, which might pervade space and contribute to dark matter or dark energy, could be revealed as they pass by Earth-based detectors.

Measurement of a rare-meson decay is an experimental achievement worth celebrating, but so far, no new physics beyond the standard model is indicated.

Cosmic gamma-ray bursts turn out to be polarized, which rules out the breaking of a fundamental symmetry down to the lowest limits ever observed.

Three major drawbacks to the ΛCDM dark matter model of the universe may be ameliorated if a proposed particle couples to dark matter and to neutrinos.

The population of Upsilon mesons in quark-gluon plasma can be used to measure the plasma’s temperature.

An analog of the dynamical Casimir effect has been achieved, where phonons replace photons and thermal fluctuations replace vacuum fluctuations.

An experiment studying B meson decays makes a direct observation of time-reversal violation without relying on assumed relationships with other fundamental symmetries.

Measurements of a possible electron electric dipole moment in ferroelectric materials are becoming increasingly sensitive.

Producing quark-gluon matter from higher-energy nuclear collisions will give insight into its fluidlike properties.

A proposed experiment could, over several years of operation, test the suspicion that the three known flavors of neutrinos sometimes transform into other, undetectable types.

An excess of tau leptons in bottom meson decays signals a puzzling departure from the standard model.