GENEVA, August 14 — The universe should not exist—at least, not as we know it. That is the stark premise at the heart of a decades-long scientific hunt, one that has now zeroed in on an elusive quantum property called baryon number. In the first moments after the Big Bang, matter and antimatter ought to have been forged in equal measure, annihilating each other in a burst of pure energy.
Yet here we are: a cosmos overwhelmingly filled with matter, with antimatter vanishingly rare. The question of why has driven physicists to probe the deepest rules of reality itself.
The Missing Link
Baryon number is the quantum label that distinguishes matter from its mirror opposite. In nearly every known interaction, it is conserved—meaning the total count before and after a reaction stays the same. But there are exceptions.
Rare processes governed by the weak nuclear force can, in theory, break this rule. And if baryon number was violated in the searing conditions of the early universe, it could explain the asymmetry we see today.
This hypothetical mechanism is called baryogenesis. To work, it requires three conditions laid out by physicist Andrei Sakharov in 1967: baryon number violation, a breach of charge conjugation parity (CP) symmetry, and a departure from thermal equilibrium. CP violation—the idea that matter and antimatter do not behave as perfect mirror images—was first glimpsed in 1964 by James Cronin and Val Fitch in the decay of neutral kaons.
It remains a cornerstone of the search.
Machines Built to Find a Needle
At CERN, the Large Hadron Collider has been operational since 2008. Its ALICE detector, built to study quark-gluon plasma, and the LHCb experiment, designed to investigate the differences between matter and antimatter, are at the forefront of the effort. In 2020, the LHCb collaboration reported observations of tetraquarks—exotic particles that may hold indirect clues about how baryon number behaves under extreme conditions.
Half a world away, Japan’s SuperKEKB collider, an upgrade of the KEKB machine which operated from 1999 to 2010, began its own hunt in 2018. It is collecting vast datasets on the decays of B mesons and other heavy particles, searching for the faint signals of CP violation with unprecedented precision.
So far, no laboratory experiment has captured direct evidence of baryon number violation. But the constraints on where and how it might occur have tightened dramatically, sharpening the theoretical models that guide the search.
What Comes Next
The story is far from over. As the LHC and SuperKEKB push deeper into uncharted territory, physicists are watching for the faintest anomalies in particle decays—signs that baryon number might, in rare instances, be broken. Each new dataset brings them closer to understanding the cosmic imbalance that made our existence possible.
What unfolded in the first fractions of a second after the Big Bang may yet be written in the debris of a collision, waiting to be read.
Sources
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