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In many extentions of standard model, dimension-5 scalar di-photon($g_{\gamma\gamma\phi}\phi$ $F^{\mu\nu}F_{\mu\nu}$ ) or pseudoscalar di-photon($g_{\gamma\gamma a}a\tilde{F}^{\mu\nu} F_{\mu\nu} $, ) interactionmaterializes due to scale symmetry breaking or $U_A(1)$ symmetry breaking. In amagnetized vacuum (i.e., in an external background field $\bar{F}_{\mu\nu} $)the transverse degrees of freedom of the photons-- for such systems-- can bedescribed in terms of the form factors constructed out of the background fieldstrength tensor ($\bar{F}_{\mu\nu} $) and the same for dynamical photon($f^{\mu\nu}$); they happen to be $\bar{F}_{\mu\nu}f^{\mu\nu}$ and${\tilde{\bar{F}}_{\mu\nu}f^{\mu\nu}}$. These form factors transformdifferently under CP transformation. While $\bar{F}_{\mu\nu}f^{\mu\nu}$(describing polarization orthogonal to B ($|\gamma_{||} >$)) is CP even,  the other one, ${\tilde{\bar{F}}_{\mu\nu}f^{\mu\nu}}$( describingpolarization along B ($|\gamma_\bot >$), is CP odd. In the interactionLagrangian, if the scalar is interchanged with the pseudoscalar, the role ofthe two form factors just gets interchanged. Thus for nearly degeneratestrengths of the coupling constants ( $g_{\gamma\gamma\phi}$ and$g_{\gamma\gamma _a}$ ) and masses ($m_\phi$ and $m_a$ ) of the respectivecandidates, proper identification of one from the other may become verydifficult in laboratory or astrophysics based experiments. The basic motivationof this investigation is to reduce this uncertainty through incorporation ofparity violating ({\it originating through magnetized medium effects }) part ofthe photon self-energy in the effective Lagrangian. This step, in turn affectsthe (Pseudo) Scalar Photon mixing dynamics drastically and brings out asignificant change in the spectrum of the electromagnetic beam undergoing suchinteraction.

Mixing dynamics of dimension-five interactions (scalar/pseudoscalar-photon) in magnetized medium