Interaction of polarized beams with particles and nuclei

Abstract

This review has two aims: (i) to present the formalism which describes the spin-polarization observables in terms of spin-state transition amplitudes in a manner that reveals the required correspondence between the theoretical and experimental definitions of the observables; then (ii) to emphasize that spin physics, the experimental and theoretical investigations of spin-polarization effects in scattering and reactions, has become a clear unifying element among the otherwise seemingly disparate fields of nuclear, particle and electron-scattering physics. Illustrative examples of research results in these fields are used to demonstrate this commonality. The important role of intrinsic spin in providing experimental investigations of parity conservation, charge symmetry and time-reversal invariance is discussed.

Excitation functions of spin correlation parametersANN,ASS, andABauer1, Bisplinghoff2, Büßer3 et al. 2005Phys. Rev. C16010View full textAdd to dashboardCite

“…This, together with the phase differences |α 5 − α 1,3,4 | ≈ 2 . These findings confirm the results obtained in [3] at T lab = 2.1 GeV: the single spin flip amplitude φ 5 , mainly driven by spin-orbit forces [60] is small at these energies and the amplitudes φ 3 with no and φ 4 with double spin flip prevail.…”

Photoproduction ofφmesons from the proton: Polarization observables and strangeness in the nucleon

“…For completeness, we briefly review here the density matrix formalism and refer the interested readers to Refs. [38][39][40][41][42] for details.…”

“…To describe the vector meson polarization completely, we have to take into account the tensor polarizations. The tensor polarization operator is defined as [39,40] …”

Tests of time-reversal invariance in nuclear and particle physics

“…Since, by definition, the P transformation of the M-matrix is M ~ M , the combination M, Mt contributes no change of sign in the P transformation of an observable, so its P symmetry is determined by the explicit spinoperators, Gj and Gk , in (7). Its T symmetry is determined in the same manner.…”