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

Heister, A.;Delaere, Christophe;et.al.
(2002) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. B530, p. 56-66 (2002)

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(en) 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. Comment: 10 pages, 3 figures
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Heister, A., Delaere, C., & et al. (2002). Search for gamma gamma ---> eta(b) in e+ e- collisions at LEP-2. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, B530, 56-66. https://doi.org/10.1016/S0370-2693(02)01329-1 (Original work published 2002)