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Basics of Perturbative QCD: Y.L. Dokshitzer V.A. Khoze

Our modern understanding of the high energy behavior of strong interactions was conceived with the idea of the parton model in the late 1960's and was born with the appearance of asymptotic freedom in the early 1970's. Partons arose out of a necessity to explain the scaling observed in deep inelastic electron scattering experiments at SLAC. This phenomenological understanding of SLAC scaling was soon extended to other hard scattering processes including e+ e- annihilation into hadrons and inclusive high px hadron production in hadron-hadron collisions. However, the idea of what exactly a parton was remained elusive and the phe-nomenological successes of the parton model remained qualitative rather than quantitative.

With the coming of asymptotic freedom in nonabelian gauge theories in the 1970's it became apparent that partons were nothing other than the quanta which occur in the theory of quark and gluons interacting by means of the gluon couplings to color charge, QCD. Asymptotic freedom allows one to consider quarks as free quanta at short distances and over short times thus making contact with the idea of a parton as a noninteracting constituent of a hadron.

It soon became clear that for many, if not all, high energy processes involving a large momentum transfer one could separate (factorize) the process into one part which involves only hard interactions and which is calculable using perturbative QCD and into a second part which requires detailed nonperturbative information as to how hadrons are built out of quarks and gluons. The parts of hard processes involving nonperturbative physics are not energy dependent and can be used in one process after having been measured in another process.

This book is aimed at two rather different audiences. Much of our discussion is descriptive and large parts of the book can be read without going through the details of the derivations of the final results. Thus one of our objectives is to make the book accessible to high energy experimental physicists. We have tried to explain the various phenomena in physical terms and we have stated results often in a directly usable way. On the other hand we have tried to be complete enough in our technical discussions so that the derivations can be followed by an ad- advanced graduate student. Little of what we cover is available in book from elsewhere.

Experimental results are coming in at a very rapid rate, especially from LEP. In order that this book should not age too rapidly we have kept comparisons with experiment to a minimum. We have tried to concentrate on the ideas and on the precise predictions of QCD. Most of the topics we have covered are reasonably mature from a theoretical perspective, though often definitive experimental tests are yet to come.

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