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In the light of the recent result from KamLAND-Zen (KLZ) and GERDA Phase-II,we update the bounds on the effective mass and the new physics parameters,relevant for neutrinoless double beta decay ($0\nu \beta \beta$). In additionto the light Majorana neutrino exchange, we analyze beyond standard modelcontributions that arise in Left-Right symmetry and R-Parity violatingsupersymmetry. The improved limit from KLZ constrains the effective mass oflight neutrino exchange down to sub-eV mass regime 0.06 eV. Using thecorrelation between the $^{136}\rm{Xe}$ and $^{76}\rm{Ge}$ half-lives, we showthat the KLZ limit individually rules out the positive claim of observation of$0\nu\beta\beta$ for all nuclear matrix element compilation. For the Left-Rightsymmetry and R-parity violating supersymmetry, the KLZ bound implies a factorof 2 improvement of the effective mass and the new physics parameters. Thefuture ton scale experiments such as, nEXO will further constrain these models,in particular, will rule out standard as well as Type-II dominating LRSMinverted hierarchy scenario.

Limiting the Effective Mass and New Physics Parameters from $0\nu\beta\beta$