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# Search for $\gamma\gamma \rightarrow \eta_b$ in $e^{+}e^{-}$ collisions at LEP2

Abstract : A search for the pseudoscalar meson eta_b is performed in two-photon interactions at LEP~2 with an integrated luminosity of 699 pb^-1 collected at e+e- centre-of-mass energies from 181 GeV to 209 GeV. One candidate event is found in the six-charged-particle final state and none in the four-charged-particle final state, in agreement with the total expected background of about one event. Upper limits of Gamma_gammagamma(eta_b) * BR(eta_b -> 4 charged particles) 48 eV Gamma_gammagamma(eta_b) * BR(eta_b -> 6 charged particles) 132 eV are obtained at 95\% confidence level, which correspond to 95\% confidence level upper limits of $9.0\%$ and $25\%$ on these branching ratios.
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Journal articles
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http://hal.in2p3.fr/in2p3-00011708
Contributor : Magali Damoiseaux <>
Submitted on : Monday, July 1, 2002 - 12:04:26 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:05 PM
Long-term archiving on: : Tuesday, June 2, 2015 - 12:30:58 PM

### Identifiers

• HAL Id : in2p3-00011708, version 1

### Citation

A. Heister, S. Schael, R. Barate, R. Bruneliere, I. de Bonis, et al.. Search for $\gamma\gamma \rightarrow \eta_b$ in $e^{+}e^{-}$ collisions at LEP2. Physics Letters B, Elsevier, 2002, 530, pp.56-66. ⟨in2p3-00011708⟩

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