title: Hard and soft supersymmetry breaking  for 'graphinos' in uniform magnetic fields.
abstract: Using irreducible and reducible representations of the Dirac matrices, we study the two- and four-component quantum mechanical supersymmetric (SUSY) theories for ultrarelativistic fermions in .2 C 1/ dimensions ('graphinos') in a background uniform magnetic field perpendicular to their plane of motion. We then consider ordinary and parity-violating mass terms and identify the former as a soft SUSY breaking term and the latter as the hard SUSY breaking one.
authors.affiliation: Instituto de Física y Matemáticas, Universidad Michoacana de San Nicolás de Hidalgo, Edificio C-3, Ciudad Universitaria, 58060 Morelia, Michoacán, Mexico. sortiz@ifm.umich.mx
authors.forename: S
authors.initials: S
authors.lastname: S Hernández-Ortíz
authors.forename: G
authors.initials: G
authors.lastname: G Murguía
authors.forename: A
authors.initials: A
authors.lastname: A Raya