Everything about reggeons.Part I:Reggeons in "soft" interaction

Abstract

This is the first part of my lectures on the Pomeron structure which I am going to read during this academic year at the Tel Aviv university. The main goal of these lectures is to remind young theorists as well as young experimentalists of what are the Reggeons that have re-appeared in the high energy phenomenology to describe the HERA and the Tevatron data. Here, I show how and why the Reggeons appeared in the theory, what theoretical problems they have solved and what they have failed to solve. I describe in details what we know about Reggeons and what we do not. The major part of these lectures is devoted to the Pomeron structure, to the answer to the questions: what is the so called Pomeron; why it is so different from other Reggeons and why we have to introduce it. In short, I hope that this lectures will be the shortest way to learn everything about Reggeons from the beginning to the current understanding. I concentrate on the problem of Reggeons in this lectures while the Reggeon interactions or the shadowing corrections I plan to discuss in the second part of my lectures. I include here only a short lecture with an outline of the main properties of the shadowing corrections to discuss a correct (from the point of the Reggeon approach) strategy of the experimental investigation of the Pomeron structure.