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 ...

The authors used negatively charged hydrogen atoms (which represent protons for technical reasons) and individual antiprotons, the latter generated by the antiproton decelerator facility at CERN, ...

In a Physical Review Letters study, the HOLMES collaboration has achieved the most stringent upper bound on the effective electron neutrino mass ever obtained using a calorimetric approach, setting a ...