Quantization of bosonic fields with two mass and spin states

We investigate bosonic fields possessing two mass and spin states. The density matrix in the first order formalism is obtained. The quantization of fields in the first order formulation is performed and propagators are found.Comment: 9 page

Vacuum Birefringence Caused by Arbitrary Spin Particles

We study the propagation of a linearly polarized laser beam in the external transverse magnetic field taking into consideration the vacuum polarization by arbitrary spin particles. Induced ellipticity of the beam are evaluated using the effective Lagrangian. With the help of the PVLAS experimental data, we obtain bounds on masses of charged higher spin particles contributed to ellipticity.Comment: 5 pages, substantial changes, shortened version matches new PVLAS data, accepted in Mod.Phys.Lett.