M. Acciarri et al., Measurements of the cross sections for open chasm and beauty production ingamma gamma collisions at root s=189-202 GeV, PHYS LETT B, 503(1-2), 2001, pp. 10-20
The production of c and b quarks gamma gamma collisions is studied with the
L3 detector at LEP with 410 pb(-1) of data, collected at centre-of-mass en
ergies from 189 GeV to 202 GeV. Hadronic final states containing c and b qu
arks are identified by detecting electrons or muons from their semileptonic
decays. The cross sections sigma (e(+)e(-) --> e(+)e(-)c (c) over barX) an
d sigma (e(+)e(-) --> e(+)e(-)b (b) over barX) are measured and compared to
next-to-leading order perturbative QCD calculations. The cross section of
b production is measured in gamma gamma collisions for the first time. It i
s in excess of the QCD prediction by a factor of three. (C) 2001 Published
by Elsevier Science B.V.