  The Majorana nature of neutrinos will be the confirmed by the observation of
the rare process called as neutrinoless double beta decay process, i.e. the
simultaneous decay of two neutrons in the nucleus of an isotope (A, Z) into two
protons and two electrons without the emission of any neutrinos i.e, $(A, Z)
\to (A, Z + 2) + 2 e^-$. The non-observation of such a decay so far has been
interpreted as a lower limit on the half life of the isotope under
investigation, which puts severe constraints on any new physics giving rise to
LNV in the electron sector. On the other hand, the standard mechanism with
normal ordering and inverted ordering can not saturate the present experimental
limit while quasi-degenerate light neutrinos are strongly disfavored by the
upper limits on the sum of light neutrino masses from cosmological data sets.
In this work, we show that how dark side of the solar neutrino parameter space
and effect of new physics contributions from right-handed currents can saturate
the experimental limit provided by KamLAND-Zen and GERDA.
