We apply the recent wavepacket formalism developed by Ossadnik to describethe origin of the short range ordered pseudogap state as the hole doping islowered through a critical density in cuprates. We argue that the energy gainthat drives this precursor state to Mott localization, follows from maximizingumklapp scattering near the Fermi energy. To this end we show how energy gapsdriven by umklapp scattering can open on an appropriately chosen surface, asproposed earlier by Yang, Rice and Zhang. The key feature is that the pairinginstability includes umklapp scattering, leading to an energy gap not only inthe single particle spectrum but also in the pair spectrum. As a result thesuperconducting gap at overdoping is turned into an insulating pseudogap, inthe antinodal parts of the Fermi surface.
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