Search for neutrinoless double beta decay with 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.; Bode, T.; Borowicz, D.; Brudanin, V.; Brugnera, R.; Caldwell, A.; Cattadori, C.; Chernogorov, A.; D’Andrea, V.; Demidova, É. V.; Marco, N. Di; Domula, A.; Doroshkevich, E.; Egorov, V.; Falkenstein, R.; Gangapshev, A. M.; Garfagnini, A.; Gooch, C.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Hakenmüller, J.; Hegai, A.; Heisel, M.; Hemmer, S.; Hofmann, W.; Hult, M.; Инжечик, Л. В.; Csáthy, J. Janicskó; Jochum, J.; Junker, M.; Kazalov, V. V.; Kihm, T.; Kirpichnikov, I. V.; Kirsch, A.; Kish, A.; Klimenko, A.; Kneißl, R.; Knies, J.; Knöpfle, K. T.; Kochetov, O.; Kornoukhov, V. N.; Kuzminov, V. V.; Laubenstein, M.; Lazzaro, A.; Lebedev, V. I.; Liao, H.; Lindner, M.; Lippi, I.; Lubashevskiy, A.; Лубсандоржиев, Б.; Lutter, G.; Majorovits, B.; Maneschg, W.; Marissens, G.; Miloradovic, M.; Mingazheva, R.; Misiaszek, M.; Moseev, P.; Nemchenok, I.; Panas, K.; Pandola, L.; Pelczar, K.; Pullia, A.; Ransom, C.; Reissfelder, M.; Riboldi, S.; Rumyantseva, N.; Sada, Cinzia; Salamida, F.; Schmitt, C.; Schneider, B.; Schönert, S.; Schreiner, J.; Schulz, O.; Schütz, A.-K.; Schwingenheuer, B.; Seitz, H.; 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.; Zuber, Κ.; Zuzel, G.

doi:10.1063/1.5007637

Cited by 19 publications

(32 citation statements)

References 4 publications

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“…We study scenarios involving multiple couplings in section 8. We apply the following experimental limits [7,12,13,86] In table 6 we show bounds on m ββ and the low-energy dimension-six, -seven, and -nine operators of eq. (3.4), which were derived using the NMEs of refs.…”

Section: Single-coupling Constraintsmentioning

confidence: 99%

“…The observation of 0νββ would have far reaching implications: it would demonstrate that neutrinos are Majorana fermions [2], shed light on the mechanism of neutrino mass generation, and give insight on leptogenesis scenarios for the generation of the matterantimatter asymmetry in the universe [3]. The current experimental limits on the halflives are already impressive [4][5][6][7][8][9][10][11][12][13], at the level of T 0ν 1/2 > 5.3 × 10 25 y for 76 Ge [12] and T 0ν 1/2 > 1.07 × 10 26 y for 136 Xe [13], with next generation ton-scale experiments aiming at a sensitivity of T 0ν 1/2 ∼ 10 27−28 y. By itself, the observation of 0νββ would not immediately point to the underlying physical origin of LNV.…”

Section: Introductionmentioning

confidence: 98%

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Neutrinoless double beta decay in chiral effective field theory: lepton number violation at dimension seven

Cirigliano

Dekens

Vries

et al. 2017

J. High Energ. Phys.

113

156

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We analyze neutrinoless double beta decay (0νββ) within the framework of the Standard Model Effective Field Theory. Apart from the dimension-five Weinberg operator, the first contributions appear at dimension seven. We classify the operators and evolve them to the electroweak scale, where we match them to effective dimension-six, -seven, and -nine operators. In the next step, after renormalization group evolution to the QCD scale, we construct the chiral Lagrangian arising from these operators. We develop a power-counting scheme and derive the two-nucleon 0νββ currents up to leading order in the power counting for each lepton-number-violating operator. We argue that the leadingorder contribution to the decay rate depends on a relatively small number of nuclear matrix elements. We test our power counting by comparing nuclear matrix elements obtained by various methods and by different groups. We find that the power counting works well for nuclear matrix elements calculated from a specific method, while, as in the case of light Majorana neutrino exchange, the overall magnitude of the matrix elements can differ by factors of two to three between methods. We calculate the constraints that can be set on dimension-seven lepton-number-violating operators from 0νββ experiments and study the interplay between dimension-five and -seven operators, discussing how dimension-seven contributions affect the interpretation of 0νββ in terms of the effective Majorana mass m ββ .

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Section: Single-coupling Constraintsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Neutrinoless double beta decay in chiral effective field theory: lepton number violation at dimension seven

Cirigliano

Dekens

Vries

et al. 2017

J. High Energ. Phys.

113

156

View full text Add to dashboard Cite

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“…High-purity Germanium (HPGe) is a good target and detector that can be used in both experiments. Since a lot of efforts have been devoted to suppress the background of the HPGe detector system, including operating in deep underground laboratories, carefully selecting low radioactive materials, producing necessary parts underground, and building active and passive shields, the background level can be typically decreased to about 1 count/(keV·kg·day) (cpkkd) for direct light dark matter detection at 2 ∼ 4 keV energy range [1,2] and about 10 −6 cpkkd for 0νββ decay detection at Q ββ of 2039 keV in recent years [3][4][5][6]. In addition to primordial radionuclides, cosmogenic radionuclides in crystals can contribute crucial backgrounds.…”

mentioning

confidence: 99%

Study on cosmogenic activation in germanium detectors for future tonne-scale CDEX experiment

Yue

Lin

et al. 2018

Sci. China Phys. Mech. Astron.

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A study on cosmogenic activation in germanium was carried out to evaluate the cosmogenic background level of natural and 70 Ge depleted germanium detectors. The production rates of longlived radionuclides were calculated with Geant4 and CRY. Results were validated by comparing the simulated and experimental spectra of CDEX-1B detector. Based on the validated codes, the cosmogenic background level was predicted for further tonne-scale CDEX experiment. The suppression of cosmogenic background level could be achieved by underground germanium crystal growth and high-purity germanium detector fabrication to reach the sensitivity requirement for direct detection of dark matter. With the low cosmogenic background, new physics channels, such as solar neutrino research and neutrinoless double-beta decay experiments, were opened and the corresponding simulations and evaluations were carried out.PACS numbers: 95.35.+d, 95.55.Vj,

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“…The ability to detect scintillation light allows to reject backgrounds with coincident energy release in HPGe detectors and LAr [8]. Results from Phase II were published in [9,11]. A detailed description of the GERDA Phase II setup can be found in [12].…”

Section: Gerdamentioning

confidence: 99%

Virtual depth by active background suppression: revisiting the cosmic muon induced background of Gerda Phase II

2018

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In-situ production of radioisotopes by cosmic muon interactions may generate a non-negligible background for deep underground rare event searches. Previous Monte Carlo studies for the Gerda experiment at Lngs identified the delayed decays of 77 Ge and its metastable state 77m Ge as dominant cosmogenic background in the search for neutrinoless double beta decay of 76 Ge. This might limit the sensitivity of next generation experiments aiming for increased 76 Ge mass at background-free conditions and thereby define a minimum depth requirement. A re-evaluation of the 77(m) Ge background for the Gerda experiment has been carried out by a set of Monte Carlo simulations. The obtained 77(m) Ge production rate is (0.21±0.01) nuclei/(kg·year). After application of state-of-the-art active background suppression techniques and simple delayed coincidence cuts this corresponds to a background contribution of (2.7 ± 0.3) × 10 −6 cts/(keV·kg·year). The suppression achieved by this strategy equals an effective muon flux reduction of more than one order of magnitude. This virtual depth increase opens the way for next generation rare event searches.

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Search for neutrinoless double beta decay with GERDA phase II

Cited by 19 publications

References 4 publications

Neutrinoless double beta decay in chiral effective field theory: lepton number violation at dimension seven

Neutrinoless double beta decay in chiral effective field theory: lepton number violation at dimension seven

Study on cosmogenic activation in germanium detectors for future tonne-scale CDEX experiment

Virtual depth by active background suppression: revisiting the cosmic muon induced background of Gerda Phase II

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