Improved Limit on Neutrinoless Double-
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 Decay of 
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 from GERDA Phase II

Agostini, M.; Bakalyarov, A. M.; Balata, M.; Барабанов, И. Р.; Baudis, L.; Bauer, C.; Bellotti, E.; Belogurov, S.; Bettini, A.; Bezrukov, L.; Biernat, J.; Bode, T.; Borowicz, D.; Brudanin, V.; Brugnera, R.; Caldwell, A.; Cattadori, C.; Chernogorov, A.; Comellato, T.; D’Andrea, V.; Demidova, É. V.; Marco, N. Di; Domula, A.; Doroshkevich, E.; Egorov, V.; Falkenstein, R.; Gangapshev, A. M.; Garfagnini, A.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Hakenmüller, J.; Hegai, A.; Heisel, M.; Hemmer, S.; Hiller, R.; Hofmann, W.; Hult, M.; Инжечик, Л. В.; Csáthy, J. Janicskó; Jochum, J.; Junker, M.; Kazalov, V. V.; Kermaïdic, Y.; Kihm, T.; Kirpichnikov, I. V.; Kirsch, A.; Kish, A.; Klimenko, A.; Kneißl, R.; Knöpfle, K. T.; Kochetov, O.; Kornoukhov, V. N.; Kuzminov, V. V.; Laubenstein, M.; Lazzaro, A.; Lindner, M.; Lippi, I.; Lubashevskiy, A.; Лубсандоржиев, Б.; Lutter, G.; Macolino, C.; Majorovits, B.; Maneschg, W.; Miloradovic, M.; Mingazheva, R.; Misiaszek, M.; Moseev, P.; Nemchenok, I.; Panas, K.; Pandola, L.; Pelczar, K.; Pertoldi, L.; Pullia, A.; Ransom, C.; Riboldi, S.; Rumyantseva, N.; Sada, Cinzia; Salamida, F.; Schmitt, C.; Schneider, B.; Schönert, S.; Schütz, A.-K.; Schulz, O.; Schwingenheuer, B.; Selivanenko, O.; Shevchik, E.; Shirchenko, M.; Simgen, H.; Smolnikov, A.; Stančo, L.; Vanhoefer, L.; Vasenko, A. A.; Veresnikova, A.; Sturm, K. von; Wagner, Victoria; Wegmann, A.; Wester, T.; Wiesinger, Christoph; Wójcik, Marcin; Yanovich, E.; Zhitnikov, I.; Жуков, С. В.; Zinatulina, D.; Zschocke, A.; Zsigmond, Anna Julia; Zuber, Κ.; Zuzel, G.

doi:10.1103/physrevlett.120.132503

Cited by 300 publications

(253 citation statements)

References 27 publications

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“…The 0νββ decay (A, Z) −→ (A, Z + 2) + 2e − is the unique process which can probes the Majorana nature of massive neutrinos. The experiments that are currently searching for the signature of 0νββ-decay are GERDA Phase II [22], CUORE [23], SuperNEMO [24], KamLAND-Zen [25] and EXO [26]. However, this process violate lepton number by two-units.…”

Section: Spontaneous Breaking Of Tmmmentioning

confidence: 99%

Breaking of the tetra-maximal neutrino mixing pattern

Nath

2020

Nuclear Physics B

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We make an attempt to study the present status of the tetra-maximal neutrino mixing (TMM) pattern. It predicts all the three leptonic mixing angles θ13 ≈ 8.4 • , θ12 ≈ 30.4 • , and θ23 = 45 • together with the three CP-violating phases −δ = ρ = σ = 90 • . However, the latest global analysis of neutrino oscillation data prefer relatively higher best-fit value of θ12 as well as non-maximal values of both θ23, δ. In order to explain the realistic data, we study the breaking of TMM pattern. We first examine the breaking of TMM due to renormalization group (RG) running effects and then study the impact of explicit breaking terms. We also examine the effect of RG-induced symmetry breaking on the effective Majorana neutrino mass in neutrinoless double beta decay experiments.

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Section: Spontaneous Breaking Of Tmmmentioning

confidence: 99%

Breaking of the tetra-maximal neutrino mixing pattern

Nath

2020

Nuclear Physics B

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“…Because of these outstanding scientific motivations, a vigorous worldwide experimental program exists searching for 0νββ. Current experimental limits are very stringent [12][13][14][15][16][17][18][19][20][21][22][23][24]; for example, the 0νββ lifetime of 136 Xe is T 0ν 1/2 > 1.07 × 10 26 yr [16]. Next-generation, ton-scale, experiments aim to improve sensitivity by one or two orders of magnitude.…”

Section: Introductionmentioning

confidence: 99%

Lattice QCD Inputs for nuclear double beta decay

Cirigliano

Detmold

Nicholson

et al. 2020

Progress in Particle and Nuclear Physics

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Second order β-decay processes with and without neutrinos in the final state are key probes of nuclear physics and of the nature of neutrinos. Neutrinoful double-β decay is the rarest Standard Model process that has been observed and provides a unique test of the understanding of weak nuclear interactions. Observation of neutrinoless double-β decay would reveal that neutrinos are Majorana fermions and that lepton number conservation is violated in nature. While significant progress has been made in phenomenological approaches to understanding these processes, establishing a connection between these processes and the physics of the Standard Model and beyond is a critical task as it will provide input into the design and interpretation of future experiments. The strong-interaction contributions to double-β decay processes are non-perturbative and can only be addressed systematically through a combination of lattice Quantum Chromoodynamics (LQCD) and nuclear many-body calculations. In this review, current efforts to establish the LQCD connection are discussed for both neutrinoful and neutrinoless double-β decay. LQCD calculations of the hadronic contributions to the neutrinoful process nn → ppe − e −ν eνe and to various neutrinoless pionic transitions are reviewed, and the connections of these calculations to the phenomenology of double-β decay through the use of effective field theory (EFTs) is highlighted. At present, LQCD calculations are limited to small nuclear systems, and to pionic subsystems, and require matching to appropriate EFTs to have direct phenomenological impact. However, these calculations have already revealed qualitatively that there are terms in the EFTs that can only be constrained from double-β decay processes themselves or using inputs from LQCD. Future prospects for direct calculations in larger nuclei are also discussed. many-body methods and effective field theory (EFT) analysis of the transition operators, where lattice QCD can provide key input. To improve upon this situation, recent efforts have advocated an "endto-end" EFT analysis of 0νββ to link the scale Λ of LNV to nuclear scales. This multi-prong approach includes various steps:1. The use of the Standard Model EFT to link the scale Λ of LNV to the hadronic scale Λ χ ∼ O(1) GeV, where non-perturbative QCD effects arise. This step is by now mature: the operator basis (to which any underlying model can be matched) is known up to dimension-nine and the renormalization group evolution of these operators under strong interactions is known. Light new degrees of freedom (such as sterile neutrinos) can also be included in this framework.2. The matching of the quark-gluon level EFT to hadronic EFTs such as Chiral Perturbation Theory (χPT) in the meson and single nucleon sector, and chiral EFT and pionless EFT in the multinucleon sector. This step can be performed consistently in the strong and weak sectors of the theory, which in the case of interest here involves ∆L = 2 transition operators. The form of the transition operators is known to...

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“…The Germanium detector array (Gerda) is an experiment located in the underground laboratory LNGS (Laboratori Nazionali del Gran Sasso) and searches for the 0νββ decay in 76 Ge [1]. Gerda operates isotopically enriched HPGe (high purity germanium) detectors in liquid argon (LAr), which serves as a cooling and shielding against external radiation.…”

Section: Introductionmentioning

confidence: 99%

In-situ measurement of the scintillation light attenuation in liquid argon in the Gerda experiment

Barros

Domula

Lehnert

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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The Gerda experiment searches for the neutrinoless double beta (0νββ) decay in 76 Ge in order to probe whether the neutrino is a Majorana particle and to shed light on the neutrino mass ordering. For investigating such a rare decay it is necessary to minimize the background of the experiment. In Phase II of the Gerda experiment the scintillation light of liquid argon (LAr) is used as an additional background veto. In order to estimate the efficiency of such a LAr veto it has to be known how far the scintillation light can travel within the LAr. A dedicated setup was built to measure the attenuation length of the scintillation light in the LAr in-situ within the cryostat of Gerda. The setup is composed of a steel tube with a photomultiplier tube (PMT) at one side and a moveable 90 Sr source at the other side to measure the light intensity at different distances between source and PMT.Furthermore, a sophisticated simulation was developed in order to determine the solid angle correction as well as the background for this measurement, both are needed for the analysis. Additionally, a set of simulation data was generated to confirm the analysis which is performed for the measured data afterwards and to find a combination of simulation parameters that matches the measured data. The analysis results in an absorption length of 15.79±0.70(stat) +1.42 −3.14 (syst) cm under the assumption of a scattering length of 70 cm at 128 nm. The simulation matching best was produced with an absorption length of 18 cm and a light yield of 2500 γ/MeV.

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Improved Limit on Neutrinoless Double- β Decay of Ge76 from GERDA Phase II

Cited by 300 publications

References 27 publications

Breaking of the tetra-maximal neutrino mixing pattern

Breaking of the tetra-maximal neutrino mixing pattern

Lattice QCD Inputs for nuclear double beta decay

In-situ measurement of the scintillation light attenuation in liquid argon in the Gerda experiment

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