Phys. Rev. Lett. 33, 1453–1455 (1974)Discovery of a Second Narrow Resonance in e+e- AnnihilationReceived 25 November 1974; published in the issue dated 9 December 1974 We have observed a second sharp peak in the cross section for e+e-→hadrons at a center-of-mass energy of 3.695±0.004 GeV. The upper limit of the full width at half-maximum is 2.7 MeV. © 1974 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.33.1453
DOI:
10.1103/PhysRevLett.33.1453
PACS:
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