Spin rotation as an element of polarization experiments on elastic electron-proton scattering

TL;DR

This paper examines the classical and quantum theories of spin rotation in magnetic fields, highlighting violations of classical rules in quantum cases and discussing implications for electron-proton polarization experiments.

Contribution

It analyzes the limitations of classical spin rotation rules within quantum theory and explores their impact on polarization measurement experiments.

Findings

Classical spin rotation rules are violated in quantum scenarios.

Implications for polarization experiments are significant.

Quantum effects alter expected spin behavior in magnetic fields.

Abstract

The validity of some rules in the classical theory of spin, which are followed by the Bargmann--Michel--Telegdi formula for a relativistic particle spin rotation in a constant homogeneous magnetic field, is analyzed. In the framework of the quantum theory, we give examples where these rules are violated. Consequences for polarization experiments are discussed.