US EditionWhere Did All the Antimatter Go? This Mismatch in How Subatomic Particles Behave Could Hold a Clue
GENEVA, SWITZERLAND, JUL 16 – Scientists observed a 2.5% CP violation in baryon decays, marking the first evidence of matter-antimatter imbalance in particles that compose most visible matter, advancing fundamental physics.
- The LHCb experiment at CERN reported the first observation of charge-parity violation in baryon decays, published in Nature in July 2025.
- This finding followed analysis of around 80,000 lambda-beauty baryon decay events collected at the LHC between 2011 and 2018, seeking differences between matter and antimatter behaviours.
- Baryons decayed to a proton, a kaon, and two pions about 5% more often than their antimatter counterparts, revealing a statistically significant 2.5% relative difference in decay rates.
- The effect reached a 5.2 sigma significance, with only a one in 10 million chance of arising from random fluctuations, showing subtle asymmetry in fundamental laws governing baryons and antibaryons.
- While consistent with Standard Model predictions, the CP violation found is insufficient alone to explain the universe's matter dominance, suggesting further sources and new physics remain to be explored.
27 Articles
27 Articles
CERN detects first matter-antimatter imbalance in Baryons, clue to universe's existence
Physicists at CERN have reported significant findings regarding the imbalance between matter and antimatter in a subatomic particle known as a baryon. This discovery may offer insights into the predominance of matter in the universe. According to the research, antiparticles, which are particles of antimatter, have the same mass as baryons but possess an opposite charge. It has been theorised that equal amounts of matter and antimatter should hav…
New discovery at Cern could hint at why our universe is made up of matter and not antimatter
Why didn’t the universe annihilate itself moments after the big bang? A new finding at Cern on the French-Swiss border brings us closer to answering this fundamental question about why matter dominates over its opposite – antimatter. Much of what we see in everyday life is made up of matter. But antimatter exists in much smaller quantities. Matter and antimatter are almost direct opposites. Matter particles have an antimatter counterpart that ha…
The world exists thanks to the victory of matter in the first of all battles. The cosmological postulates say that the Big Bang, the primal outburst that gave rise to the universe, generated as much matter as antimatter. The first, visible and constituted by atoms and particles, would have the second as its antithesis: exactly the same, but with opposite charge. In theory, both would have had to have annihilated each other shortly after the grea…
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