In this Letter the rate for the decay K-L(0) double right arrow K(+/-)e(-/+)(v/v) of (0.0979 +/- 0.0037) s(-1) has been calculated in the hypothesis of the conserved vector current and, assuming the CP violation very small, the two rates for the decay K-L(0) double right arrow K- e(+)v and K-L(0) double right arrow K+ e(-)v are foreseen very similar. Such a decay was never taken into account in the past, due to the very low phase space factor yielding a branching ratio for K-L decay BR = (0.5071 +/- 0.0199) x 10(-8). Now, with the very intense K beams foreseen at KEK, J-PARC, BNL, CERN and LNF the observation of this decay seems feasible. With samples of very large statistical significance a new measurement of the indirect CP violation parameter a could be done. (c) 2006 Elsevier B.V. All rights reserved.
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