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The team allowed the photons to pass through a thin sliver of the mineral calcite which gave each photon a tiny nudge in its path, with the amount of deviation dependent on which slit it passed through. By averaging over a great many photons passing through the apparatus, and only measuring the light patterns on a camera, the team was able to infer what paths the photons had taken. While they were able to easily observe the interference...


 quantum physics uncertainty particle wave interference law physics philosophy
The most accurate measurement yet of the shape of the electron has shown it to be almost perfectly spherical. Electrons are negatively-charged elementary particles which orbit the nuclei of atoms. The discovery is important because it may make some of the emerging theories of particle physics - such as supersymmetry - less likely.


 particle physics shape sphere electron
Neutrinos are among the fundamental building blocks of matter. They swarm all about us. The Sun, for example, releases them in huge quantities when it fuses hydrogen to make helium - the raw nuclear process at its core. They are, however, very difficult to study because they interact so weakly with normal matter. Hence, their nickname - "ghost particles". Nonetheless, scientists have been able to discern three flavours - electron...


 neutrino particle physics nuclear cosmology antimatter universe Big Bang
Results from the Large Hadron Collider (LHC) have all but killed the simplest version of an enticing theory of sub-atomic physics. Researchers failed to find evidence of so-called "supersymmetric" particles, which many physicists had hoped would plug holes in the current theory. Theorists working in the field have told BBC News that they may have to come up with a completely new idea.


 LHC supersymmetry theory particle physics nuclear
The collaboration behind the finding in September that neutrinos may travel faster than light has carried out an improved version of their experiment - and found the same result. If confirmed by other experiments, the find could undermine one of the basic principles of modern physics.


 physics light speed neutrino experiment particle
The Large Hadron Collider (LHC) on the Franco-Swiss border has made its first clear observation of a new particle since opening in 2009. It is called Chi_b (3P) and will help scientists understand better the forces that hold matter together.


 LHC particle physics matter universe
The Majorana fermion was first predicted 75 years ago - a particle that could be its own anti-particle.


 quantum physics antimatter Majorana physics particle
The mystery surrounding the source of the highest-energy particles known in the Universe has grown deeper. The particles, known as cosmic rays, can show up with energies a million times higher than the biggest particle accelerators on Earth can produce. Astrophysicists believed that only two sources could make them: supermassive black holes in active galaxies, or so-called gamma ray bursts. A study in Nature has now all but ruled out gamma...


 gamma ray black hole particle energy universe galaxy cosmic ray neutrino