Evidence for Quasiparticle Decay in Photoemission from Underdoped Cuprates

I argue that the “gap” recently observed at the Brillouin zone face of cuprate superconductors in photoemission by Marshall et al. [Phys. Rev. Lett. 76, 4841 (1996)] and Ding et al. [Nature 382, 54 (1996)] is evidence for the decay of the injected hole into a spinon-holon pair.