Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-10-08
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages including 18 figures, uuencoded postscript file. [Based on talks given at the PSI school at Zuoz, and at CERN and DES
Scientific paper
A wide variety of experimental data in hadronic reactions are described in terms of the exchange of an object called the soft pomeron. It is nonperturbative in origin and is perhaps associated with glueballs. The HERA measurements of $\nu W_2$ at small $x$ suggest the possibility that there is also a hard pomeron, which is perturbative. I review the experimental and theoretical methods that are used to explore the two pomerons and emphasise the problems that remain to be solved.
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