Phys.org

Particle that only has mass when moving in one direction observed for first time

For the first time, scientists have observed a collection of particles, also known as a quasiparticle, that's massless when moving one direction but has mass in the other direction. The quasiparticle, ...
Yahoo

Physicists Find Particle That Only Has Mass When Moving in One Direction

Scientists have made a satisfying and intriguing physics discovery some 16 years after it was first predicted to be a possibility: a quasiparticle (a group of particles behaving as one) that only has ...
The Hindu

‘Strange’ particle found to have mass when moving in one direction, not another

Since the start of the 20th century, physicists have discovered a veritable zoo of subatomic particles. Matter can be both wave and particle. If you take the particle route, these subatomic particles ...
Techno-Science.net

This particle has no mass... unless it moves in a specific direction

A particle that changes its behavior depending on the direction it takes: in one direction, it glides effortlessly as if it weighs nothing. In the other, it seems to have weight. This might sound like ...