Very early on in our universe, when it was a seething hot cauldron of energy, particles made of matter and antimatter bubbled into existence in equal proportions. For example, negatively charged electrons were created in the same numbers as their antimatter siblings, positively charged positrons. When the two particles combined, they canceled each other out.
Billions of years later, our world is dominated by matter. Somehow, matter “won out” over antimatter, but scientists still do not know how. Now, two of the largest experiments attempting to find answers—projects that focus on subatomic particles called neutrinos —have joined forces.
In a new Nature study, an international collaboration representing the experiments—NOvA in the United States and T2K in Japan—present some of the most precise neutrino measurements in the field. The two teams decided to combine their data to learn more than any one experiment alone could.









