Comments on "On the Dirac-Majorana neutrinos distinction in four-body decays" (arXiv:2305.14140 [hep-ph], Phys. Rev. D 109, no.3, 033005 (2024))

Abstract

In arXiv:2305.14140 [hep-ph] the authors analyze the radiative leptonic decay ${\ell }^{-}\to {\nu }_{\ell }{\overline{\nu }}_{{\ell }^{\prime }}{\ell }^{\prime -}\gamma$ to distinguish between Dirac and Majorana nature of neutrinos. They utilize the back-to-back kinematics for this purpose, a special kinematic configuration which we first proposed in our paper arXiv:2106.11785 [hep-ph]. Here we point out how and why their analysis of the back-to-back configuration is incorrect. This makes their conclusion and comments invalid and untenable.

Comments: 4 pages, 0 figures