Bottom Production in Two-Photon Collisions at LEP
designing interactive systems(2002)
Abstract
Results on inclusive and exclusive bottom production in gammagamma collisions
are presented. The total cross section of inclusive bottom production is
investigated through its leptonic decays at LEP II energies by the experiments
L3 and OPAL. The average cross section, after correction for acceptances and
efficiencies, is sigma_tot = 13.3 +- 1.5 +- 2.3 pb. The next-to-leading order
calculations are lower than the data by a factor three, which corresponds to a
difference of more than three standard deviations.
ALEPH studied the exclusive bottom production. Searching for the eta_b one
candidate is found. Limits on Gamma_gammagamma(eta_b)*BR for 4 and 6 charged
particles are extracted. The candidate has a mass of 9.30 +- 0.04 GeV.
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Key words
standard deviation,particle physics,cross section,charged particles
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