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In strongly-correlated systems the electronic properties at the Fermi energy(EF) are intertwined with those at high energy scales. One of the pivotalchallenges in the field of high-temperature superconductivity (HTSC) is tounderstand whether and how the high energy scale physics associated withMott-like excitations (|E-E$_{F}$|>1 eV) is involved in the condensateformation. Here we show the interplay between the many-body high-energy CuO2excitations at 1.5 and 2 eV and the onset of HTSC. This is revealed by a noveloptical pump supercontinuum-probe technique, which provides access to thedynamics of the dielectric function inBi$_2$Sr$_2$Ca$_{0.92}$Y$_{0.08}$Cu$_2$O$_{8+{\delta}}$ over an extended energyrange, after the photoinduced suppression of the superconducting pairing. Theseresults unveil an unconventional mechanism at the base of HTSC both below andabove the optimal hole concentration required to attain the maximum criticaltemperature (T$_c$).

Revealing the high-energy electronic excitations underlying the onset of high-temperature superconductivity in cuprates