Antimatter Responds to Gravity in Same Way as Regular Matter, New Experiments Suggest physics science
The Standard Model of particle physics is both incredibly successful and glaringly incomplete. Among the questions left open is the striking imbalance of matter and antimatter in the Universe, which inspires experiments to compare the fundamental properties of matter/antimatter conjugates with high precision. The new experiments by the
Finding any slight difference between the masses of protons and antiprotons, or between the ratios of their electric charge and mass, would break a fundamental symmetry of the Standard Model, called CPT symmetry, and point to new physics phenomena beyond the Model. To make their proton and antiproton measurements, physicists from the BASE Collaboration confined antiprotons and negatively charged hydrogen ions, which are negatively charged proxies for protons, in a state-of-the-art particle trap called aIn this device, a particle follows a cyclical trajectory with a frequency, close to the cyclotron frequency, that scales with the trap’s magnetic-field strength and the particle’s charge-to-mass ratio.
From these comparisons, and after accounting for the difference between a proton and a negatively charged hydrogen ion, the BASE team found that the charge-to-mass ratios of protons and antiprotons are equal to within 16 parts per trillion. In addition to comparing protons and antiprotons with an unprecedented precision, the scientists used their measurements to place stringent limits on models beyond the Standard Model that violate CPT symmetry, as well as to test a fundamental physics law known as the weak equivalence principle.
Any difference between the gravitational interaction of protons and antiprotons would result in a difference between the proton and antiproton cyclotron frequencies.
France Dernières Nouvelles, France Actualités
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