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

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

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

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

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.

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

Two collaborations at the Tevatron have combined data from their searches for the Higgs boson and report evidence of a new particle decaying into heavy quark pairs. This could be the first experimental evidence that the same mechanism that gives mass to the carriers of the weak force also underlies the mass of quarks.