'One-positron cyclotron' could test a key prediction of the Standard Model
The positron is the antimatter counterpart of the electron, identical in mass but carrying an equal and opposite electric charge. Like the electron, it also behaves like a tiny bar magnet, and according to a key prediction of the Standard Model of particle physics, its magnetic moment should be exactly equal and opposite to the electron's.
The standard model of particle physics predicts that the magnetic moments of electrons and positrons should be equal and opposite. Scientists at Northwestern University, led by Gerald Gabrielse, have developed a new method to test this prediction by trapping a single positron in a quantum cyclotron. This approach builds on the principle of CPT symmetry, which suggests that if particles were swapped with their antiparticles, the universe would appear unchanged.
By capturing and cooling a single positron in a Penning trap, the researchers were able to measure its magnetic moment with unprecedented precision. This technique could allow for magnetic moment measurements of positrons that are 30 times more accurate than current methods. Successfully demonstrating this method would represent a significant step in testing the limits of the standard model and exploring potential new physics beyond it.
Written by urgent.news from Phys.org's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
