Following reports of anomalous dielectron prediction in the mass region near 6 GeV at 400 GeV, we searched for an enhancement in the reaction e+e-→hadrons and e+e-→e+e- at SPEAR in the center-of-mass energy range 5.67-6.43 GeV. The leptonic and hadronic cross sections show no statistically significant peaks. In this mass range, 95% confidence level upper limits for the decay width into electron pairs are less than 200 eV for a narrow resonance which decays predominantly either into hadrons or into electron pairs.
Search for Narrow Resonant States in e^{+}e^{-} Collisions near 6 GeV
LIVAN, MICHELE;
1977-01-01
Abstract
Following reports of anomalous dielectron prediction in the mass region near 6 GeV at 400 GeV, we searched for an enhancement in the reaction e+e-→hadrons and e+e-→e+e- at SPEAR in the center-of-mass energy range 5.67-6.43 GeV. The leptonic and hadronic cross sections show no statistically significant peaks. In this mass range, 95% confidence level upper limits for the decay width into electron pairs are less than 200 eV for a narrow resonance which decays predominantly either into hadrons or into electron pairs.File in questo prodotto:
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