Search for gammagamma -> etab in e+e- collisions at LEP2
ALEPH Collaboration
Abstract
A search for the pseudoscalar meson etab 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 Gammagammagamma(etab) * BR(etab -> 4 charged particles) < 48 eV Gammagammagamma(etab) * BR(etab -> 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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