Why Is CERN Making Antimatter?

TL;DR

CERN makes antimatter to study whether it behaves differently from matter, potentially explaining why the universe contains matter at all instead of nothing.

Key Points

• 1.Antimatter is the most expensive substance in the universe. CERN scientists estimated its cost at over $100 trillion per gram — far beyond the $1 billion per gram figure commonly cited.
• 2.CERN's antimatter factory produces ~30–40 million anti-protons every two minutes. Protons are accelerated to 99.93% the speed of light and smashed into a 3mm iridium rod target, generating anti-proton showers in 10⁻²³ seconds.
• 3.The matter-antimatter asymmetry is the central mystery CERN is trying to solve. For every billion matter-antimatter pairs in the early universe, one extra matter particle survived — everything we see today descends from those lucky one-in-a-billion particles.
• 4.The Standard Model can only account for an asymmetry of 10⁻¹⁸, a billion times too small. Kobayashi and Maskawa's 1973 framework explains observed CP violation while preserving CPT symmetry, but falls far short of explaining the observed matter dominance.
• 5.Madame Chien-Shiung Wu proved parity symmetry is violated in 1957. Her cobalt-60 experiment showed 60% of electrons emitted opposite to nuclear spin — proving the universe distinguishes left from right — yet she was never awarded the Nobel Prize.
• 6.Anti-hydrogen was first made at CERN in 1995 but survived only 40 billionths of a second. The challenge of storing neutral antimatter was solved using a magnetic trap, since Penning traps only work for charged particles like anti-protons.
• 7.In 2023, the Alpha-G experiment confirmed antimatter falls downward under gravity. They measured gravitational acceleration of anti-hydrogen as 75% of normal gravity ±13–16%, ruling out anti-gravity but with error bars too large to be conclusive.
• 8.GBAR aims to measure antimatter's gravitational acceleration to 1% precision by cooling anti-hydrogen ions to 10 micro-Kelvin. This requires making anti-hydrogen ions (one anti-proton, two positrons), laser-cooling beryllium ions to transfer energy away, then dropping a neutral anti-atom 20 cm.
• 9.BASE experiment created the world's first portable antimatter trap, storing anti-protons for a record 614 days. The trap has its own power supply and cooling system, enabling anti-protons to be transported outside the accelerator environment to quieter labs.
• 10.On March 24, 2026, CERN shipped antimatter by truck for the first time. An 800 kg trap containing 92 anti-protons was loaded onto a vehicle and driven on a 10 km loop, marking the start of potentially distributing antimatter to research institutions worldwide.