$\rho$ exchange contribution to neutrinoless double beta decay
High Energy Physics - Phenomenology
2023-07-12 v1
Abstract
We consider meson contributions to neutrinoless double beta decay amplitude stemming from the hadronization of the short distance quark-electron currents. These contributions are evaluated within vacuum dominance approximation. The one and two exchange contributions affect the Fermi transition nuclear matrix element in a way that lead to near cancellations in the same chirality, left-left and right-right, short range amplitudes when these new contributions are combined with the conventional short range amplitudes, while the left-right amplitude almost triples. This then necessitates the inclusion of exchange amplitudes in any phenomenological study, like in left-right theories.
Cite
@article{arxiv.2102.02185,
title = {$\rho$ exchange contribution to neutrinoless double beta decay},
author = {Namit Mahajan},
journal= {arXiv preprint arXiv:2102.02185},
year = {2023}
}