'One-positron cyclotron' could test a key prediction of the Standard Model

Physicists propose measuring the positron's magnetic moment in a one-positron cyclotron. The Standard Model predicts it should be exactly equal and opposite to the electron's, and the experiment would test that prediction.

• The positron is the electron's antimatter twin with equal mass and opposite charge
• The Standard Model predicts an equal-magnitude, opposite-sign magnetic moment
• A one-positron cyclotron would measure the antiparticle's magnetic moment