The
SLAC-SP-017
collaboration
Augustin, J.E.
;
Boyarski, A.
;
Breidenbach, Martin
;
et al.
Phys.Rev.Lett. 33 (1974) 1406-1408, 1974.
https://inspirehep.net/literature/91761
Inspire Record
91761
DOI
10.17182/hepdata.21247
https://doi.org/10.17182/hepdata.21247
We have observed a very sharp peak in the cross section for e+e−→hadrons, e+e−, and possibly μ+μ− 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.