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The question of pairing glue for the cuprate superconductors (SC)is revisitedand its determination through the angle resolved photo-emission spectroscopy(ARPES) is discussed in detail. There are two schools of thoughts about thepairing glue question: One argues that superconductivity in the cupratesemerges out of doping the spin singlet resonating valence bond (RVB) state.Since singlet pairs are already formed in the RVB state there is no need foradditional boson glue to pair the electrons. The other instead suggests thatthe d-wave pairs are mediated by the collective bosons like the conventionallow $T_c$ SC with the alteration that the phonons are replaced by another kindof bosons ranging from the antiferromagnetic (AF) to loop current fluctuations.An approach to resolve this dispute is to determine the frequency and momentumdependences of the diagonal and off-diagonal self-energies directly fromexperiments like the McMillan-Rowell procedure for the conventional SC. In thata simple d-wave BCS theory describes superconducting properties of the cuprateswell, the Eliashberg analysis of well designed high resolution experimentaldata will yield the crucial frequency and momentum dependences of theself-energies. This line of approach using ARPES are discussed in more detailin this review, and some remaining problems are commented.

Comments on the d-wave pairing mechanism for cuprate high $T_c$ superconductors: Higher is different?