Search for eta_b in two-photon collisions at LEP II with the DELPHI detector
The DELPHI Collaboration, J. Abdallah, et al
TL;DR
This study searches for the eta_b meson in two-photon collisions at LEP II using the DELPHI detector, setting upper limits on its production and decay modes based on collected data.
Contribution
First search for eta_b in two-photon interactions at LEP II, providing upper limits on production rates and decay channels.
Findings
Upper limits on Gamma_{γγ}(eta_b) x BR(eta_b) at 95% confidence level
Data sample of 617 pb^{-1} at energies 161-209 GeV
No definitive eta_b signal observed
Abstract
The pseudoscalar meson eta_b has been searched for in two-photon interactions at LEP II. The data sample corresponds to a total integrated luminosity of 617 pb^{-1} at centre-of-mass energies ranging from 161 to 209 GeV. Upper limits at a confidence level of 95% on the product Gamma_{\gamma\gamma}(eta_b) x BR(eta_b) are 190, 470 and 660 eV/c^2 for the eta_b decaying into 4, 6 and 8 charged particles, respectively.
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