A discussion of the cross section $\bar\nu_e+p\to e^+ + n$

We discuss the interaction cross section $\bar\nu_e-p$ due to charged currents, of major importance for neutrino detection. We present the history of its understanding and highlight the aspects necessary for its precise evaluation. We examine the three most recent determinations and, on the basis of the most recent one, tabulate its updated values and assess its uncertainty.