Search for narrow high mass resonances in radiative decays of the Z0

We search for new resonances, Y, with mass M Y , in the range from 30 to 89 GeV, produced via the reaction e + e − → Z 0 → γ Y, where Y subsequently decays into e + e − , μ + μ − or hadrons. We use 5.5.pb −1 of data collected in the energy range 88.2 ⩽ s ⩽ 94.2 GeV, near the Z 0 peak. We obtain the following upper limits, at the 95% confidence level, on the product of the branching ratios: BR(Z 0 → γ Y) × BR(Y → e + e − ) < 2.8 × 10 −4 for 30 < M Y < 89, BR(Z 0 → γ Y × BR(Y → μ + μ − ) < 2.3 × 10 −4 for 30 < M Y < 89, BR(Z 0 → γ Y) × BR(Y → hadrons) < 4.7 × 10 −4 for 30 < M Y < 86. These limits are valid for resonances with widths smaller than our mass resolution.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
Z0: radiative decay
radiative decay: Z0
search for: narrow resonance
narrow resonance: search for

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