Election recognizes the new member鈥檚 鈥渙utstanding record of scientific and technical achievement and willingness to assist the Academy in providing the best available scientific information and technical understanding to inform complex policy decisions in Washington.鈥澛�
On June 3, scientists working on the Muon g-2 experiment (pronounced “mew-on gee-minus-two”) released the third and final measurement of the muon magnetic anomaly. This result agrees with the published results from 2021 and 2023 but with a much better precision of 127 parts per billion, surpassing the original experimental design goal of 140 parts per billion.
A particle physics experiment decades in the making 鈥� the Muon g-2 experiment 鈥� looks increasingly like it might set up a showdown over whether there are fundamental particles or forces in the universe that are unaccounted for in the current Standard Model. On Aug. 10, the international team of scientists behind Muon g-2 鈥� pronounced 鈥済 minus 2鈥� 鈥� released the world鈥檚 most precise measurement yet of the anomalous magnetic moment of the muon. Calculating the muon鈥檚 magnetic moment at a high precision will indicate whether it is interacting solely with the particles and forces known today, or if unknown particles or forces are out there.
An international research team, including scientists from the 黑料吃瓜网, has established a new upper limit on the mass of the neutrino, the lightest known subatomic particle. In a paper published Feb. 14 in Nature Physics, the collaboration 鈥� known as the Karlsruhe Tritium Neutrino Experiment or KATRIN 鈥� reports that the neutrino鈥檚 mass is below 0.8 electron volts, or 0.8 eV/c2. Honing in on the elusive value of the neutrino鈥檚 mass will solve a major outstanding mystery in particle physics and equip scientists with a more complete view of the fundamental forces and particles that shape ourselves, our planet and the cosmos.
The first results from the Muon g-2 experiment hosted at Fermi National Accelerator Laboratory show fundamental particles called muons behaving in a way not predicted by the Standard Model of particle physics. These results confirm an earlier experiment of the same name performed at Brookhaven National Laboratory. Combined, the two results show strong evidence that our best theoretical model of the subatomic world is incomplete. One potential explanation would be the existence of undiscovered particles or forces.
In a study published March 26 in Physical Review Letters, collaborators of the MAJORANA DEMONSTRATOR have shown they can shield a sensitive, scalable 44-kilogram germanium detector array from background radioactivity. This accomplishment is critical to developing a much larger future experiment to study the nature of neutrinos.