Observation of $\Delta^{++}$ (1232) Production in $e^+ e^-$ Annihilations Around 10-{GeV}

We report on the first observation of Δ(1232) ++ and Δ(1232)++¯ baryons in e + e − annihilation at energies around 10 GeV, using the ARGUS detector at DORIS II. The sum of the rates of Δ ++ and Δ++¯ per hadronic event in the continuum is measured to be 0.040±0.008±0.006, and the rate in direct ϒ(1S) decays is 0.124±0.016±0.015. The momentum spectrum of Δ ++ baryons in direct ϒ(1S) decays has been measured.

ELECTRON POSITRON: COLLIDING BEAMS
COLLIDING BEAMS: ELECTRON POSITRON
ELECTRON POSITRON: ANNIHILATION
ANNIHILATION: ELECTRON POSITRON
DELTA(1232)++: ELECTROPRODUCTION
ELECTROPRODUCTION: DELTA(1232)++
DELTA(1232)++: ANTIPARTICLE
YIELD: (DELTA(1232)++)
MASS SPECTRUM: (P PI+)
(P PI+): MASS SPECTRUM

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Observation of Δ++\Delta^{++}Δ++ (1232) Production in e+e−e^+ e^-e+e− Annihilations Around 10-{GeV}

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Observation of $\Delta^{++}$ (1232) Production in $e^+ e^-$ Annihilations Around 10-{GeV}