The most precise experiments ever to compare the mass of the proton and antiproton reveal no difference between the particles Particle physicists are well aware that their worldview is still imperfect ...

The molecular hydrogen ion H₂⁺ is the simplest molecule. This simplicity makes it a perfect study object for physicists, as its properties—for example, its energy levels—can be calculated precisely.

It’s confirmed: Protons and antiprotons are well-matched. The two types of subatomic particles mirror each other in the ratios of their electric charge to mass, a new extremely precise experiment ...

No matter how precise the measurement, matter and antimatter look stubbornly similar. An ultrasensitive experiment comparing protons with their antimatter counterparts found no difference in the ...

High precision: the BASE experiment at CERN has put tight limits on some properties of the antiproton. (Courtesy: Maximilien Brice/CERN/CC-BY-4.0) Precise measurements of the motions of antiprotons ...