https://doi.org/10.1140/epja/i2005-10315-8
Hadron Physics
Spin-
beyond the Rarita-Schwinger framework
1
Insituto de Fisica, Universidad de Guanajuato, Lomas del Bosque 103, Fracc. Lomas del Campestre, 37150, Leon, Guanajuato, Mexico
2
Instituto de Fisica, UASLP, Av. Manuel Nava 6, Zona Universitaria, SLP 78290, San Luis Potosi, Mexico
* e-mail: mauro@fisica.ugto.mx
Received:
15
October
2005
Accepted:
1
September
2006
Published online:
20
September
2006
We employ the two independent Casimir operators of the Poincaré group, the squared four-momentum, p2, and the squared Pauli-Lubanski vector, W2, in the construction of a covariant mass m, and spin- projector in the four-vector spinor, ψμ. This projector provides the basis for the construction of an interacting Lagrangian that describes a causally propagating spin-
particle coupled to the electromagnetic field by a gyromagnetic ratio of
.
PACS: 11.30.Cp Lorentz and Poincaré invariance – / 03.65.Pm Relativistic wave equations –
© Società Italiana di Fisica and Springer-Verlag, 2006