The reaction e+e-e+e-0 0 has been observed with the Crystal Ball detector at the DORIS II storage ring at DESY. The 0 0 mass spectrum is dominated by the , and the two-photon width is determined to be 4.6 0.4 0.6 keV. Limits on X ×BX are given for other possible states.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)