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The dynamics of excitations with different symmetry is investigated in thesuperconducting (SC) and normal state of the high-temperature superconductorBi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ (Bi2212) using optical pump-probe (Pp)experiments with different light polarizations at different doping levels. Theobservation of distinct selection rules for SC excitations, present in A$_{{\rm1g}}$ and B$_{{\rm 1g}}$ symmetries, and for the PG excitations, present inA$_{{\rm 1g}}$ and B$_{{\rm 2g}}$ symmetries, by the probe and absence of anydependence on the pump beam polarization leads to the unequivocal conclusion ofthe existence of a spontaneous spatial symmetry breaking in the pseudogap (PG)state.

Dynamics of broken symmetry nodal and anti-nodal excitations in Bi_{2} Sr_{2} CaCu_{2} O_{8+\delta} probed by polarized femtosecond spectroscopy