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Search for gamma gamma ---> eta(b) in e+ e- collisions at LEP-2

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>28/03/2002
<mark>Journal</mark>Physics Letters B
Number of pages11
<mark>Original language</mark>English


A search for the pseudoscalar meson ηb 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 eV, eV are obtained at 95% confidence level, which correspond to upper limits of 9.0% and 25% on these branching ratios.