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Search for gammagamma -> eta_b in e+e- collisions at LEP2

ALEPH Collaboration
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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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ALEPH Collaboration. 2002-02-04. Search for gammagamma -> eta_b in e+e- collisions at LEP2. https://doi.org/10.1016/s0370-2693(02)01329-1

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