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News and Views
Nature 452, 293-294 (20 March 2008) | doi:10.1038/452293a; Published online 19 March 2007
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Director of NMR
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Particle physics: Song of the electroweak penguin
Michael E. Peskin1
Abstract
An unexpected imbalance in how particles containing the heaviest quarks decay might reveal exotic influences — and perhaps help to explain why matter, rather than antimatter, dominates the Universe.
Elsewhere in this issue, the Belle collaboration, based at the electron–positron particle collider of the high-energy accelerator laboratory KEK in Japan, announces their measurement of an anomalous asymmetry in the decay rates of exotic particles known as B mesons (Lin et al., page 332)1. Combined with recent measurements of the same decays from the BaBar collaboration2, 3, a similar experiment at the Stanford Linear Accelerator Center (SLAC) in California, the new finding provides a tantalizing glimpse of a possible new source for a very fundamental asymmetry: the dominance of matter over antimatter in our Universe.
- Michael E. Peskin is in the Theoretical Physics Group, Particle Physics and Astrophysics Division, Stanford Linear Accelerator Center, Stanford University, Menlo Park, California 94025, USA.
Email: mpeskin@slac.stanford.edu
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