Photon Structure and Heavy Flavour Production in gammagamma Collisions at LEP
msra(2003)
Abstract
New results reported at the Moriond-QCD 2003 conference from the experiments
ALEPH, DELPHI, L3, and OPAL on the structure of the photon as well as heavy
quark production in gammagamma collisions are presented. The hadronic structure
of the photon is studied in single-tagged events; the interaction of two
virtual photons is investigated in double-tagged events. Di-jet events allow,
besides constraining the photon structure, investigations on the structure of
jets, measurement of the di-jet as well as inclusive and differential cross
sections. Inclusive charm and bottom production are investigated at LEP~2
energies. The total and differential cross sections for charm quarks are now
measured by all four LEP collaborations, the total bottom by two. Charmonia are
detected inclusively via the muonic decay of the J/psi and separated for the
resolved and diffractive processes. Updated results are available for exclusive
production of the eta_c meson. The search for exclusive eta_b production is
presented.
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Key words
high energy physics,cross section
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