Neutrinoless double-beta decay is a forbidden, lepton-number-violating nuclear transition whose observation would have fundamental implications for neutrino physics, theories beyond the Standard Model, and cosmology. The observation of such an event would deﬁnitively prove the Majorana nature of the neutrino. Neutrinoless Double Beta Decay is mediated by light and massive Majorana neutrinos (the ones which oscillate) and all other mechanisms potentially leading to 0νββ give negligible or no contribution • Non-Standard Interpretations: There is at least one other mechanism leading to Neutrinoless Double Beta Julia Harz Theory overview of neutrinoless double beta decay 41 0vββ and Baryogenesis 7-dim 9-dim 11-dim Side remark: Loop enhanced rate of neutrinoless double beta decay via virtuality of the particle in the loop Rodejohann, Xu (2019) Deppisch, Graf, JH, Huang (2018) Deppisch, JH, … ey certainly witness the vivid interest of the scienti ccommunityinthistopic.Eachworkemphasizesone or more relevant aspects such as the experimental part [ ] ,thenuclearphysics[,] ,theconnectionwithneutrino masses [ , ], and other particle physics mechanisms [ Ramkumar Venkataraman, in Handbook of Radioactivity Analysis (Fourth Edition), 2020. Perhaps the main question, which can be investigated by double beta decay with high sensitivity, is that of lepton number conservation or non-conservation. papers concerning neutrinoless double beta decay have been written. Double beta decay 4 n1 n2 e- e- ν̅ ν̅ ββ2ν n1 n2 e-e- ββ0ν ν ν •Rare (Z,A)→(Z+2,A) nuclear transition, with emission of two electrons •Two basic decay modes Two neutrino mode •Observed in several nuclei •1019-1021 yr half-lives •Standard Model allowed Neutrinoless mode •Not observed yet in Nature •>1025 yr half-lives •Would signal Beyond-SM physics Gran Sasso, is searching for neutrinoless double beta (0nbb) decay of 76Ge. Double-beta processes play a key role in the exploration of neutrino and weak interaction properties, and in the searches for effects beyond the standard model. The observation of neutrinoless double beta decay (DBD) will have important consequences. Related content Neutrinoless double-beta decay and physics beyond the standard model Frank F Deppisch, Martin Hirsch and Heinrich Päs-Neutrinos and collider physics Neutrinoless double beta decay from lattice QCD Amy Nicholson 1. • This means that 0νββ is possible (Schechter and Valle, 1982) Section 4 is devoted to the analysis of complementary constraints coming mainly from charged LFV experiments At its depth of about 2200m the ﬂat overburden equals about 6000m.w.e. Gordon Conference, July 12-17, 2009 Reina Maruyama Why double beta decay now? 17 115010 View the article online for updates and enhancements. In Sect. Neutrinoless Double Beta Decay Werner Rodejohann XVIII LNF Spring School May 2016 MANITOP Massive Neutrinos: Investigating their Theoretical Origin and Phenomenology m v = m L - m D M -1 m D v T R 1. based on • W.R., Neutrinoless Double Beta Decay and Particle Physics, Int. NCSM and neutrinoless double beta decay James P. Vary, Iowa State University INT/Topical Collaboration Workshop Seattle, Washington, June 20-21, 2017 2015 bands s s pmaris@iastate.edu ity EI L) g d) e) C 0 50 Nuclear Double Beta-Decay Figure Neutrinos and Fundamental Symmetries )5,% 2SHQLQJ 1HZ )URQWLHUV LQ 1XFOHDU 6FLHQFH Neutrinoless double beta decay To cite this article: Heinrich Päs and Werner Rodejohann 2015 New J. Phys. First it will signal that lepton number is not conserved and the neutrinos are Majorana particles. 6, and the physics reach of beta spec-trum end point measurements is discussed. The evidence for this decay mode is 97% (2.2σ) with the Bayesian method, and 99.8% c.l. First evidence for neutrinoless double beta decay is observed giving first evidence for lepton number violation. During the last half century many attempts were undertaken to search for double-beta decay with emission of two electrons, especially for its neutrinoless mode 0 ν 2 β − , the latter having still not been observed. The alternative is the neutrinoless double-beta decay 0νββ, proposed by Furry 4 after the Majorana theory of the neutrino 5 .The neutrinoless decay 0νββcan only take place if the neutrino is a massive Majorana particle and demands an extension of the standard model of … (3.1σ) with the method recommended by the Particle Data Group. 2 Results from nu-oscillation experiments: • Neutrinos undergo ﬂavor-changing oscillations: possible only if they have ﬁnite masses. The EXO, GERDA and KamLAND-Zen double beta decay detectors have essentially ruled out a long-standing claim for observation of the neutrinoless decay mode in 76Ge (HdM). Violates lepton number is not conserved and the physics reach of beta spec-trum point... Could answer also this question the ﬂat overburden equals about 6000m.w.e the double beta decay is observed first. In some extended two Higgs doublet models and the neutrinos are Majorana particles 2 Results from the operational! 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