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The polarization of cosmic microwave background (CMB) can be used toconstrain cosmological birefringence, the rotation of the linear polarizationof CMB photons potentially induced by parity violating physics beyond thestandard model. This effect produces non-null CMB cross correlations betweentemperature and B mode-polarization, and between E- and B-mode polarization.Both cross-correlations are otherwise null in the standard cosmological model.We use the recently released 2015 Planck likelihood in combination with theBicep2/Keck/Planck (BKP) likelihood to constrain the birefringence angle$\alpha$. Our findings, that are compatible with no detection, read $\alpha =0.0^{\circ} \pm 1.3^{\circ} \mbox{ (stat)} \pm 1^{\circ} \mbox{ (sys)} $ for{\sc Planck} data and $\alpha = 0.30^{\circ} \pm 0.27^{\circ} \mbox{ (stat)}\pm 1^{\circ} \mbox{(sys)} $ for BKP data. We finally forecast the expectedimprovements over present constraints when the Planck BB, TB and EB spectra athigh $\ell$ will be included in the analysis.

Constraints on cosmological birefringence from Planck and Bicep2/Keck data