Science

Matter–antimatter asymmetry still provides no evidence of new physics

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Briefings

A new LHCb analysis of meson decays narrowed the search for new physics explaining matter-antimatter asymmetry, reducing the required energy scale by a factor of 1000. This finding leaves the scale of the imbalance unknown and suggests future measurements will be more precise. The evidence remains inconclusive regarding the existence of new physics.

Key points

• LHCb collaboration analyzed meson decays to constrain new physics scenarios.
• The analysis reduced the required energy scale for new physics by a factor of 1000.

Context

The universe's dominance by ordinary matter is compelling evidence that matter and antimatter are not perfect reflections of each other. Known differences do not explain the scale of this imbalance, leaving open the possibility that unknown physics is responsible.

Limitations

The analysis narrowed the search scope but did not confirm the existence of new physics. The scale of the matter-antimatter asymmetry remains unknown, and future measurements will be more precise.

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