Abstract
We have observed a very sharp peak in the cross section for , and possibly at a center-of-mass energy of 3.105±0.003 GeV. The upper limit to the full width at half-maximum is 1.3 MeV.
- Received 13 November 1974
DOI:https://doi.org/10.1103/PhysRevLett.33.1406
©1974 American Physical Society
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Letters from the Past - A PRL Retrospective
2008 marked PRL’s 50th anniversary. As part of the celebrations a collection of milestone Letters was started. The collection contains Letters that have made long-lived contributions to physics, either by announcing significant discoveries, or by initiating new areas of research.
Focus
Landmarks—The Charming Debut of a New Quark
Published 26 February 2016
An unexpected particle discovery in 1974 was the first evidence for a fourth type of quark.
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