# About the WORKSHOP

The 2017 International Summer Workshop on Reaction Theory is dedicated to theory and phenomenology of scattering theory and its application to data analysis of modern experiments in strong interactions physics. As a new frontier in particle and nuclear physics has opened up with advances in experimental, theoretical and computational techniques there is new demand for a qualitatively new level of sophistication in data analysis never before achieved. These require deep knowledge of the methods in relativistic scattering theory. For at least two decades scattering theory has essentially disappeared from the physics curriculum and generations of physicists have been educated without this basic knowledge. Few have working experience with topics related to the analysis of relativistic reactions that involve aspects of Regge phenomenology, crossing relations and duality, analytic continuations, dispersion relations, etc., and the phenomenological application of all these concepts.

The Workshop will be organized around the seminal text, Strong Interactions of Hadrons at High Energies, by V. N. Gribov (Cambridge University Press, 2008). The outline of the text follows closely the aims of the Workshop, as it treats the analysis of relativistic reactions that involves aspects of analyticity, crossing relations and duality, resonances and electromagnetic interactions of hadrons, dispersion relations, and Reggeon Field Theory.

The Workshop will consist of daily lectures from junior researchers in the morning.
The early afternoon session will feature special-topics seminars. During the second session of the afternoon,
the attendees will work on problem sets and review sessions. The lecturer from that morning will lead sessions, where the problems will be based on material covered in that morning’s lectures.

There will also be opportunities for participants to present their current research.

The Workshop is dedicated in memory of Vladimir Gribov
who passed away on August 13, 1997.

Vladimir Naumovich Gribov received his Ph.D. in theoretical physics in 1957 from the Physico-Technical Institute in Leningrad, and be came the head of the Theory Division of the Particle Physics Department in 1962. From 1971, when the Petersburg (Leningrad) Institute for Nuclear Physics was organized, Gribov led the Theory Division of the Institute. In 1980 he became Head of the particle physics section of the Landau Institute for Theoretical Physics, Moscow. From 1981 he regularly visited the Research Institute for Particle and Nuclear Physics in Budapest where he was a scientific adviser until his death in 1997. Vladimir Gribov was one of the leading theoretical physicists of his time, who made seminal contributions in quantum electrodynamics, neutrino physics, non-Abelian field theory, and, in particular, the physics of hadron interactions at high energies.

The book is based on his lecture course for graduate students. The lectures present a concise, step-by-step construction of the relativistic theory of strong interactions, aiming at a self-consistent description of the world in which total hadron interaction cross sections are nearly constant at very high collision energies. Originally delivered in the mid-1970s, when quarks were fighting for recognition and quantum chromodynamics had barely been invented, the content of the course has not been ‘modernized.’ Instead, it fully explores the general analyticity and cross-channel unitarity properties of relativistic theory, setting severe restrictions on the possible solution that quantum chromodynamics, as a microscopic theory of hadrons and their interactions, has yet to find. The book is unique in its coverage: it discusses in detail the basic properties of scattering amplitudes (analyticity, unitarity, crossing symmetry), resonances and electro-magnetic interactions of hadrons, and it introduces and studies reggeons and, in particular, the key player – the ‘vacuum regge pole’ (pomeron). It builds up the field theory of interacting pomerons, and addresses the open problems and ways of attacking them.