QCD and high energy hadronic interaction: Summary talk (theory)

Results presented in perturbative QCD are reviewed. The topics discussed include: struction functions, heavy flavour production, direct photon production, inclusive production at LHC/SSC, small x physics, QCD jets and intermittency. For reference to the data in this talk see the summary presented by J.E. Augustin. 1. Struction functions. New data on deep inelastic structure functions by NMC and CCFR experiments, together with a reanalysis of EMC and SLAC data have been used by the Durham and CTEQ groups [1] to construct a new 1992 set of structure function parameterization. This topic has been summarized by W.K. Tung. The importance of the new data can be appreciated by observing that in the region of x between 10 and 10 the gluon density G(x,Q) in the two sets are very similar. However, if one [2] takes into account also the new CDF data on b-production a modification of G(x,Q) in the region of x ∼ 0.05 is required. The gluon density will soon be constrained by Hera measurements down to values of x ∼ 10. 2. Heavy flavour productions in next-to-leading order. These are typical short distance processes due to the large mass of the heavy quark MQ ≫ ΛQCD. The canonical formula for the heavy flavour production in pp hadronic collider has the form