PHOTOPRODUCTION OF PIONS FROM THE NUCLEON

The basic features of relativistic quantum mechanics
are outlined as well as the Bakamjian Thomas
procedure for constructing quantum mechanical models
that satisfy the requirements of special relativity.
The general structure of the mass operator obtained
in a Bakamjian Thomas construction is given. The
procedure for constructing quantum mechanical states
that transform correctly under the action of the
Poincaré group is presented. Both proper Poincaré
transformations and space inversions are considered.
A derivation is given of the general structure of a
Poincaré and gauge invariant mass operator that
couples baryon states to photon baryon states and
meson-baryon states to photon baryon states. The
general isospin structure of such a mass operator is
also developed. The Lippmann Schwinger equations
that the mass operator gives rise to are presented
and the relation of their solutions to multipole
amplitudes is obtained. Various formulas for cross
sections are derived. Okubo s method and effective
Lagrangians are used to derive a model for a mass
operator that describes the photoproduction of pions
from the nucleon.

Autorentext

Hamoud H. Alharbi is holding assistant research professor position at King Abdulaziz City for Science and Technology (KACST). He received his bachelor's in physics from King Saud University, Saudi Arabia, followed by a master's in 1995 at Sussex University, and received Ph.D. from the state University of New York at Buffalo in 2002.

Klappentext

The basic features of relativistic quantum mechanics are outlined as well as the Bakamjian-Thomas procedure for constructing quantum mechanical models that satisfy the requirements of special relativity. The general structure of the mass operator obtained in a Bakamjian-Thomas construction is given. The procedure for constructing quantum mechanical states that transform correctly under the action of the Poincaré group is presented. Both proper Poincaré transformations and space inversions are considered. A derivation is given of the general structure of a Poincaré and gauge invariant mass operator that couples baryon states to photon-baryon states and meson-baryon states to photon-baryon states. The general isospin structure of such a mass operator is also developed. The Lippmann-Schwinger equations that the mass operator gives rise to are presented and the relation of their solutions to multipole amplitudes is obtained. Various formulas for cross sections are derived. Okubo's method and effective Lagrangians are used to derive a model for a mass operator that describes the photoproduction of pions from the nucleon.