Kopylov, G. I. Foundations of Resonance Kinematics (Osnovy kinematiki rezonansov), 1970. In Russian.

Копылов Г. И.Основы кинематики резонансов.
Москва : Наука, Главная редакция физико-математической литературы, 1970.
488 с. Твёрдый издательский переплёт, обычный формат.
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Kopylov, G. I.Foundations of Resonance Kinematics (Osnovy kinematiki rezonansov).
Moscow: Nauka Publishers, Main Editorial Board for Physics and Mathematics Literature, 1970.
488 pp. Hardcover, 14 × 21 cm.

This 1970 monograph is a definitive work in the field of high-energy physics, authored by Gertsen Kopylov, a brilliant researcher from the Joint Institute for Nuclear Research (JINR) in Dubna. Writing at a time when the discovery of new hadronic resonances was revolutionizing our understanding of the subatomic world, Kopylov provided the first comprehensive mathematical and physical framework for identifying these short-lived particles through their decay products.The volume is dedicated to the complex kinematics required to reconstruct "resonances"—particles that exist for such a short time (about $10^{-23}$ seconds) that they cannot be observed directly, but only inferred from the energy and momentum of the particles into which they decay. Kopylov systematically explores the geometry of phase space, Dalitz plots, and the statistical methods used to separate true physical signals from background noise in bubble chamber and spark chamber experiments.Kopylov was known not only for his technical mastery but also for his clarity as a scientific writer; this book effectively bridges the gap between abstract theoretical physics and the practical needs of experimentalists working at the world's major particle accelerators. It remains a classic reference for the "Dubna school" of physics and an essential piece of literature for those studying the history of the discovery of the quark model and the spectroscopic classification of hadrons.