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Recent observation of a mass enhancement in high magnetic fields in nearlyoptimally doped cuprates poses several puzzles. For the suggested nodalelectron pocket induced by bidirectional charge order in high field, we proposethat the mass enhancement is very anisotropic around the small Fermi surface.The corners of the pocket are proposed to have a big enhancement without anyenhancement along the diagonal nodal direction. A natural mechanism for suchangle dependent mass enhancement comes from the destruction of the Landauquasiparticle at hot spots on the large Fermi surface at a proximate quantumcritical point. The possibility of a divergent cyclotron effective mass isdiscussed within a scaling theory for such a quantum critical point. Weconsider both a conventional quantum critical point associated with the onsetof charge order in a metal and an unconventional one where an antinodalpseudogap opens simultaneously with the onset of charge order. The latter maydescribe the physics of the strange metal regime at zero magnetic field.

On the mass enhancement near optimal doping in high magnetic fields in the cuprates