New Limit for Neutrinoless Double-Beta Decay of 
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 from the CUPID-Mo Experiment

Armengaud, E.; Augier, C.; Barabash, A. S.; Bellini, F.; Benato, G.; Benoı̂t, A.; Beretta, M.; Bergé, L.; Billard, J.; Borovlev, Yu. A.; Bourgeois, C.; Brudanin, V.; Camus, P.; Cardani, L.; Casali, N.; Cazes, A.; Chapellier, M.; Charlieux, F.; Chiesa, D.; Combarieu, M. de; Dafinei, I.; Danevich, F.A.; Jésus, M. de; Dixon, T.; Dumoulin, L.; Eitel, K.; Ferri, F.; Fujikawa, B. K.; Gascon, J.; Gironi, L.; Giuliani, A.; Grigorieva, V. D.; Gros, M.; Guerard, E.; Helis, D.; Huang, H. Z.; Huang, R. G.; Johnston, J.; Juillard, A.; Khalife, H.; Kleifges, M.; Kobychev, V.; Kolomensky, Yu. G.; Коновалов, С. И.; Leder, A.; Loaiza, P.; Ma, L.; Makarov, E. P.; Marcillac, P. de; Mariam, R.; Marini, L.; Marnieros, S.; Misiak, D.; Navick, X.F.; Nones, C.; Norman, E. B.; Novati, V.; Olivieri, E.; Ouellet, J. L.; Pagnanini, L.; Pari, P.; Pattavina, L.; Paul, Biswajit; Pavan, M.; Peng, H.; Pessina, G.; Pirro, S.; Poda, D.V.; Polischuk, O. G.; Pozzi, S.; Previtali, E.; Redon, T.; Rojas, Alma D.; Rozov, S.; Rusconi, C.; Sanglard, V.; Scarpaci, J. A.; Schäffner, K.; Schmidt, Benjamin; Shen, Yang; Shlegel, V.N.; Siebenborn, B.; Singh, V.; Tomei, C.; Tretyak, V. I.; Umatov, V. I.; Vagneron, L.; Velázquez, M.; Welliver, B.; Winslow, L. A.; Xue, M.; Yakushev, E.; Zarytskyy, M. M.; Zolotarova, A.

doi:10.1103/physrevlett.126.181802

Cited by 82 publications

(52 citation statements)

References 72 publications

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“…For example, in the analysis of CUORE data [30], delayed coincidences could help to better constrain the background sources [31] and to reject the time-correlated events falling in the region of interest. Moreover, the R&D activities for CUPID [32,33], CUPID-Mo [34][35][36], and in general the experiments searching for rare events can profit from this technique to study the radioactive contaminations of detector components and to select ultra-pure materials, with also the possibility to analyze other decay sequences in 238 U, 232 Th and 235 U chains [37]. Finally, the analysis of delayed coinci-dences in CUPID-0 allowed to measure the half-life of 216 Po [38].…”

Section: Discussionmentioning

confidence: 99%

Background identification in cryogenic calorimeters through $$\alpha -\alpha $$ delayed coincidences

et al. 2021

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Localization and modeling of radioactive contaminations is a challenge that ultra-low background experiments are constantly facing. These are fundamental steps both to extract scientific results and to further reduce the background of the detectors. Here we present an innovative technique based on the analysis of $$\alpha -\alpha $$ α - α delayed coincidences in $${}^{232}$$ 232 Th and $${}^{238}$$ 238 U decay chains, developed to investigate the contaminations of the ZnSe crystals in the CUPID-0 experiment. This method allows to disentangle surface and bulk contaminations of the detectors relying on the different probability to tag delayed coincidences as function of the $$\alpha $$ α decay position.

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Section: Discussionmentioning

confidence: 99%

Background identification in cryogenic calorimeters through $$\alpha -\alpha $$ delayed coincidences

et al. 2021

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“…The search for neutrinoless double beta (0νββ) decay is the most promising experimental path to determine whether the neutrino is a Majorana fermion, with far-reaching implications in particle physics and cosmology [1][2][3][4][5]. Presently, several collaborations pursue different technologies for detecting 0νββ decay with the leading experiments focusing on 76 Ge [6][7][8], 136 Xe [9][10][11][12][13][14][15], 130 Te [10,16,17], and 100 Mo [18][19][20]. The long half-life of 0νββ decay (above 1.8 × 10 26 yr in 76 Ge [6] and 1.07 × 10 26 yr in 136 Xe [9]) makes its detection extremely difficult, with only a few candidate 0νββ events expected throughout the running life of an experiment, calling for outstanding background suppression capabilities.…”

Section: Introductionmentioning

confidence: 99%

Boosting background suppression in the NEXT experiment through Richardson-Lucy deconvolution

Simón¹,

Ifergan²,

Redwine³

et al. 2021

J. High Energ. Phys.

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Next-generation neutrinoless double beta decay experiments aim for half-life sensitivities of ∼ 1027 yr, requiring suppressing backgrounds to < 1 count/tonne/yr. For this, any extra background rejection handle, beyond excellent energy resolution and the use of extremely radiopure materials, is of utmost importance. The NEXT experiment exploits differences in the spatial ionization patterns of double beta decay and single-electron events to discriminate signal from background. While the former display two Bragg peak dense ionization regions at the opposite ends of the track, the latter typically have only one such feature. Thus, comparing the energies at the track extremes provides an additional rejection tool. The unique combination of the topology-based background discrimination and excellent energy resolution (1% FWHM at the Q-value of the decay) is the distinguishing feature of NEXT. Previous studies demonstrated a topological background rejection factor of ∼ 5 when reconstructing electron-positron pairs in the 208Tl 1.6 MeV double escape peak (with Compton events as background), recorded in the NEXT-White demonstrator at the Laboratorio Subterráneo de Canfranc, with 72% signal efficiency. This was recently improved through the use of a deep convolutional neural network to yield a background rejection factor of ∼ 10 with 65% signal efficiency. Here, we present a new reconstruction method, based on the Richardson-Lucy deconvolution algorithm, which allows reversing the blurring induced by electron diffusion and electroluminescence light production in the NEXT TPC. The new method yields highly refined 3D images of reconstructed events, and, as a result, significantly improves the topological background discrimination. When applied to real-data 1.6 MeV e−e+ pairs, it leads to a background rejection factor of 27 at 57% signal efficiency.

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“…We find that our model predicts the effective Majorana neutrino mass parameter in the range m ββ (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) meV for the case of normal hierarchy. The new limit T 0νββ 1/2 ( 100 Mo) ≥ 1.5 × 10 24 yr on the half-life of 0νββ decay in 100 Mo has been recently obtained [81]. This new limit translates into a corresponding upper bound on m ββ ≤ (300-500) meV at 90% CL.…”

Section: Lepton Masses and Mixingsmentioning

confidence: 88%

Controlled fermion mixing and FCNCs in a ∆(27) 3+1 Higgs Doublet Model

Hernández

Varzielas

López-Ibáñez

et al. 2021

J. High Energ. Phys.

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We propose a 3+1 Higgs Doublet Model based on the ∆(27) family symmetry supplemented by several auxiliary cyclic symmetries leading to viable Yukawa textures for the Standard Model fermions, consistent with the observed pattern of fermion masses and mixings. The charged fermion mass hierarchy and the quark mixing pattern is generated by the spontaneous breaking of the discrete symmetries due to flavons that act as Froggatt-Nielsen fields. The tiny neutrino masses arise from a radiative seesaw mechanism at one loop level, thanks to a preserved $$ {Z}_2^{(1)} $$ Z 2 1 discrete symmetry, which also leads to stable scalar and fermionic dark matter candidates. The leptonic sector features the predictive cobimaximal mixing pattern, consistent with the experimental data from neutrino oscillations. For the scenario of normal neutrino mass hierarchy, the model predicts an effective Majorana neutrino mass parameter in the range 3 meV ≲ mββ ≲ 18 meV, which is within the declared range of sensitivity of modern experiments. The model predicts Flavour Changing Neutral Currents which constrain the model, for instance, μ→e nuclear conversion processes and Kaon mixing are found to be within the reach of the forthcoming experiments.

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New Limit for Neutrinoless Double-Beta Decay of Mo100 from the CUPID-Mo Experiment

Abstract: opens the question of neutrino mass generation. Instead of having Dirac nature as charged leptons and quarks, the scale of neutrino masses could be well motivated by the Majorana theory [2,3]. In this scenario neutrinos could coincide with their antimatter partner [4, 5] which

Cited by 82 publications

References 72 publications

Background identification in cryogenic calorimeters through $$\alpha -\alpha $$ delayed coincidences

Background identification in cryogenic calorimeters through $$\alpha -\alpha $$ delayed coincidences

Boosting background suppression in the NEXT experiment through Richardson-Lucy deconvolution

Controlled fermion mixing and FCNCs in a ∆(27) 3+1 Higgs Doublet Model

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