antihydrogen

Even the tiniest differences between hydrogen and antihydrogen could undermine modern theories of physics, says study coauthor Makoto Fujiwara, a particle physicist at the Canadian national particle accelerator center, TRIUMF, also in Vancouver.

To craft antihydrogen atoms, Momose and colleagues mixed antiprotons with positrons, the antiparticles of electrons, at the CERN particle physics lab near Geneva.

Over several hours, a laser beam tuned to a specific frequency of UV light slowed the antihydrogen atoms from whizzing around at up to 90 meters per second to about 10 meters per second.