Neutrinoless Double Beta Decay: 2015 Review by Stefano Dell’Oro, Simone Marcocci, Matteo Viel, Francesco Vissani

“…The discovery of neutrino masses through the observation of oscillations boosted the importance of neutrinoless double beta decay (0νββ). In this paper, we review the main features of this process, underlining its key role from both the experimental and theoretical point of view. …”
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The MAJORANA DEMONSTRATOR Neutrinoless Double-Beta Decay Experiment by N. Abgrall, E. Aguayo, F. T. Avignone, A. S. Barabash, F. E. Bertrand, M. Boswell, V. Brudanin, M. Busch, A. S. Caldwell, Y.-D. Chan, C. D. Christofferson, D. C. Combs, J. A. Detwiler, P. J. Doe, Yu. Efremenko, V. Egorov, H. Ejiri, S. R. Elliott, J. Esterline, J. E. Fast, P. Finnerty, F. M. Fraenkle, A. Galindo-Uribarri, G. K. Giovanetti, J. Goett, M. P. Green, J. Gruszko, V. E. Guiseppe, K. Gusev, A. L. Hallin, R. Hazama, A. Hegai, R. Henning, E. W. Hoppe, S. Howard, M. A. Howe, K. J. Keeter, M. F. Kidd, A. Knecht, O. Kochetov, S. I. Konovalov, R. T. Kouzes, B. D. LaFerriere, J. Leon, L. E. Leviner, J. C. Loach, P. N. Luke, S. MacMullin, R. D. Martin, S. Mertens, L. Mizouni, M. Nomachi, J. L. Orrell, C. O'Shaughnessy, N. R. Overman, David Phillips, A. W. P. Poon, K. Pushkin, D. C. Radford, K. Rielage, R. G. H. Robertson, M. C. Ronquest, A. G. Schubert, B. Shanks, T. Shima, M. Shirchenko, K. J. Snavely, N. Snyder, D. Steele, J. Strain, A. M. Suriano, J. Thompson, V. Timkin, W. Tornow, R. L. Varner, S. Vasilyev, K. Vetter, K. Vorren, B. R. White, J. F. Wilkerson, T. Williams, W. Xu, E. Yakushev, A. R. Young, C.-H. Yu, V. Yumatov

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Macroscopic neutrinoless double beta decay: Long range quantum coherence by Gordon Baym, Jen-Chieh Peng

“…We discuss the similarities and differences between the MDBD and conventional neutrinoless double beta decay. While MDBD is clearly not a viable replacement for traditional 0νDBD experiments, analysis of the concept of MDBD offers new perspectives on the physics of neutrinoless double beta decays.…”
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Getting Information on |Ue3|2 from Neutrinoless Double Beta Decay by Alexander Merle, Werner Rodejohann

“…Moreover, we show that a measurement of |Ue3| from neutrinoless double beta decay is very difficult due to the expected errors on the effective mass and the oscillation parameters.…”
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Constraints on Light Neutrino Parameters Derived from the Study of Neutrinoless Double Beta Decay by Sabin Stoica, Andrei Neacsu

“…Our results may be useful to have an updated image on the present neutrino mass sensitivities associated with 0νββ measurements for different isotopes and to better estimate the range of values of the neutrino masses that can be explored in the future double beta decay (DBD) experiments.…”
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Neutrinoless double beta decay from scalar leptoquarks: interplay with neutrino mass and flavor physics by P. S. Bhupal Dev, Srubabati Goswami, Chayan Majumdar, Debashis Pachhar

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The 0ν2β-decay CROSS experiment: preliminary results and prospects by The CROSS collaboration, I. C. Bandac, A. S. Barabash, L. Bergé, M. Brière, C. Bourgeois, P. Carniti, M. Chapellier, M. de Combarieu, I. Dafinei, F. A. Danevich, N. Dosme, D. Doullet, L. Dumoulin, F. Ferri, A. Giuliani, C. Gotti, P. Gras, E. Guerard, A. Ianni, H. Khalife, S. I. Konovalov, E. Legay, P. Loaiza, P. de Marcillac, S. Marnieros, C. A. Marrache-Kikuchi, C. Nones, V. Novati, E. Olivieri, C. Oriol, G. Pessina, D. V. Poda, T. Redon, V. I. Tretyak, V. I. Umatov, M. M. Zarytsky, A. S. Zolotarova

Subjects: “…Dark Matter and Double Beta Decay (experiments)…”
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Lower Mass Bound on the W′ Mass via Neutrinoless Double Beta Decay in a 3-3-1 Model by A. C. O. Santos, P. Vasconcelos

“…The discovery of neutrino masses has raised the importance of studies in the context of neutrinoless double beta decay (0νββ), which constitutes a landmark for lepton number violation (LNV). …”
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High Scale Type-II Seesaw, Dominant Double Beta Decay within Cosmological Bound and LFV Decays in SU(‎5) by M. K. Parida, Rajesh Satpathy

“…Besides predicting verifiable LFV decays, we further show that the model predicts dominant double beta decay with normal hierarchy or inverted hierarchy of active light neutrino masses in concordance with cosmological bound. …”
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A CaMoO4 Crystal Low Temperature Detector for the AMoRE Neutrinoless Double Beta Decay Search by G. B. Kim, S. Choi, F. A. Danevich, A. Fleischmann, C. S. Kang, H. J. Kim, S. R. Kim, Y. D. Kim, Y. H. Kim, V. A. Kornoukhov, H. J. Lee, J. H. Lee, M. K. Lee, S. J. Lee, J. H. So, W. S. Yoon

“…We report the development of a CaMoO4 crystal low temperature detector for the AMoRE neutrinoless double beta decay (0νββ) search experiment. The prototype detector cell was composed of a 216 g CaMoO4 crystal and a metallic magnetic calorimeter. …”
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Axion-like relics: new constraints from old comagnetometer data by Itay M. Bloch, Yonit Hochberg, Eric Kuflik, Tomer Volansky

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First demonstration of a TES based cryogenic Li $$_2$$ 2 MoO $$_4$$ 4 detector for neutrinoless double beta decay search by G. Bratrud, C. L. Chang, R. Chen, E. Cudmore, E. Figueroa-Feliciano, Z. Hong, K. T. Kennard, S. Lewis, M. Lisovenko, L. O. Mateo, V. Novati, V. Novosad, E. Oliveri, R. Ren, J. A. Scarpaci, B. Schmidt, G. Wang, L. Winslow, V. G. Yefremenko, J. Zhang, D. Baxter, M. Hollister, C. James, P. Lukens, D. J. Temples

“…Abstract Cryogenic calorimetric experiments to search for neutrinoless double-beta decay ( $$0\nu \beta \beta $$ 0 ν β β ) are highly competitive, scalable and versatile in isotope. …”
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Significance of Broken μ−τ Symmetry in Correlating δCP, θ13, Lightest Neutrino Mass, and Neutrinoless Double Beta Decay 0νββ by Gayatri Ghosh

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Status of the GERDA Experiment at the Laboratori Nazionali del Gran Sasso by R. Brugnera, A. Garfagnini

“…Measurements on two-neutrino double beta decay (2νββ) giving T1/22ν=(1.88±0.10)×1021 yr and recently published background model and pulse shape performances of the detectors are discussed in the paper. …”
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Neutrinoless Double β+/EC Decays by Jukka Maalampi, Jouni Suhonen

“…The relation of neutrino masses to neutrino oscillations and the nuclear double beta decay is highlighted. In particular, the neutrinoless β+β+, β+EC, and resonant ECEC decays are investigated using microscopic nuclear models. …”
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Neutrino Mass from Cosmology by Julien Lesgourgues, Sergio Pastor

“…In this contribution we summarize the main aspects of cosmological relic neutrinos, and we describe how the precision of present cosmological data can be used to learn about neutrino properties, in particular their mass, providing complementary information to beta decay and neutrinoless double-beta decay experiments. We show how the analysis of current cosmological observations, such as the anisotropies of the cosmic microwave background or the distribution of large-scale structure, provides an upper bound on the sum of neutrino masses of order 1 eV or less, with very good perspectives from future cosmological measurements which are expected to be sensitive to neutrino masses well into the sub-eV range.…”
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Convoluted ν-Signals on 114Cd Isotope from Astrophysical and Laboratory Neutrino Sources by Vaitsa Tsakstara

“…At first, we evaluate scattering cross sections of low, and intermediate-energy neutrinos scattered off the 114 Cd isotope, the most abundant Cd isotope present also in the COBRA detector (CdTe and CdZnTe materials) which aims to search for double beta decay events and neutrino observations at Gran Sasso laboratory (LNGS). …”
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Non-holomorphic modular S 4 lepton flavour models by Gui-Jun Ding, Jun-Nan Lu, S.T. Petcov, Bu-Yao Qu

“…We identify the phenomenologically viable models and obtain predictions for each of these models for the neutrino mass ordering, the absolute neutrino mass scale, the Dirac and Majorana CP-violation phases and, correspondingly, for the sum of neutrino masses and the neutrinoless double beta decay effective Majorana mass. We comment on how these models can be tested and conclude that they are all falsifiable. …”
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Deviations From μ‐τ Symmetry Using Δ27 Group on Neutrino Masses and Mixings by Ph. Wilina, N. Nimai Singh

“…The model further predicts effective neutrino masses for neutrinoless double beta decay, 4.15 meV≤mee≤30.6 meV; tritium beta decay, 8.4 meV≤mβ≤30.5 meV; Jarlskog invariant, JCP=±0.022 for CP violation; baryon asymmetry YB=1.15×10−10 for normal hierarchical case; and also 49.5 meV≤mee≤51.7 meV, 49.5 meV≤mβ≤51.4 meV, JCP=±0.022, and YB=1.12×10−10 for inverted hierarchical case, respectively.…”
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Current Status and Future Prospects of the SNO+ Experiment by S. Andringa, E. Arushanova, S. Asahi, M. Askins, D. J. Auty, A. R. Back, Z. Barnard, N. Barros, E. W. Beier, A. Bialek, S. D. Biller, E. Blucher, R. Bonventre, D. Braid, E. Caden, E. Callaghan, J. Caravaca, J. Carvalho, L. Cavalli, D. Chauhan, M. Chen, O. Chkvorets, K. Clark, B. Cleveland, I. T. Coulter, D. Cressy, X. Dai, C. Darrach, B. Davis-Purcell, R. Deen, M. M. Depatie, F. Descamps, F. Di Lodovico, N. Duhaime, F. Duncan, J. Dunger, E. Falk, N. Fatemighomi, R. Ford, P. Gorel, C. Grant, S. Grullon, E. Guillian, A. L. Hallin, D. Hallman, S. Hans, J. Hartnell, P. Harvey, M. Hedayatipour, W. J. Heintzelman, R. L. Helmer, B. Hreljac, J. Hu, T. Iida, C. M. Jackson, N. A. Jelley, C. Jillings, C. Jones, P. G. Jones, K. Kamdin, T. Kaptanoglu, J. Kaspar, P. Keener, P. Khaghani, L. Kippenbrock, J. R. Klein, R. Knapik, J. N. Kofron, L. L. Kormos, S. Korte, C. Kraus, C. B. Krauss, K. Labe, I. Lam, C. Lan, B. J. Land, S. Langrock, A. LaTorre, I. Lawson, G. M. Lefeuvre, E. J. Leming, J. Lidgard, X. Liu, Y. Liu, V. Lozza, S. Maguire, A. Maio, K. Majumdar, S. Manecki, J. Maneira, E. Marzec, A. Mastbaum, N. McCauley, A. B. McDonald, J. E. McMillan, P. Mekarski, C. Miller, Y. Mohan, E. Mony, M. J. Mottram, V. Novikov, H. M. O’Keeffe, E. O’Sullivan, G. D. Orebi Gann, M. J. Parnell, S. J. M. Peeters, T. Pershing, Z. Petriw, G. Prior, J. C. Prouty, S. Quirk, A. Reichold, A. Robertson, J. Rose, R. Rosero, P. M. Rost, J. Rumleskie, M. A. Schumaker, M. H. Schwendener, D. Scislowski, J. Secrest, M. Seddighin, L. Segui, S. Seibert, T. Shantz, T. M. Shokair, L. Sibley, J. R. Sinclair, K. Singh, P. Skensved, A. Sörensen, T. Sonley, R. Stainforth, M. Strait, M. I. Stringer, R. Svoboda, J. Tatar, L. Tian, N. Tolich, J. Tseng, H. W. C. Tseung, R. Van Berg, E. Vázquez-Jáuregui, C. Virtue, B. von Krosigk, J. M. G. Walker, M. Walker, O. Wasalski, J. Waterfield, R. F. White, J. R. Wilson, T. J. Winchester, A. Wright, M. Yeh, T. Zhao, K. Zuber

“…Designed as a multipurpose neutrino experiment, the primary goal of SNO+ is a search for the neutrinoless double-beta decay (0νββ) of 130Te. In Phase I, the detector will be loaded with 0.3% natural tellurium, corresponding to nearly 800 kg of 130Te, with an expected effective Majorana neutrino mass sensitivity in the region of 55–133 meV, just above the inverted mass hierarchy. …”
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