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A. S. Barabash - One of the best experts on this subject based on the ideXlab platform.
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Double Beta Decay to the excited states: Review
2017Co-Authors: A. S. BarabashAbstract:A brief review of Double Beta Decay to the excited states of daughter nuclei is given. Results of the most sensitive experiments are presented.A brief review of Double Beta Decay to the excited states of daughter nuclei is given. Results of the most sensitive experiments are presented.
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Review of modern Double Beta Decay experiments
2015Co-Authors: A. S. BarabashAbstract:The review of modern experiments on search and studying of Double Beta Decay processes is done. Results of the most sensitive current experiments are discussed. The main attention is paid to EXO-200, KamLAND-Zen, GERDA-I and CUORE-0 experiments. Modern values of T1/2(2ν) and best present limits on neutrinoless Double Beta Decay and Double Beta Decay with Majoron emission are presented. Conservative limits on effective mass of a Majorana neutrino (〈mν〉 < 0.46 eV) and a coupling constant of Majoron to neutrino (〈gee〉 < 1.3 · 10−5) are obtained. Prospects of search for neutrinoless Double Beta Decay in new experiments with sensitivity to 〈mν〉 at the level of ∼ 0.01-0.1 eV are discussed.
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Double Beta Decay experiments: current status and prospects
Physics-Uspekhi, 2014Co-Authors: A. S. BarabashAbstract:Double Beta Decay experiments are reviewed and the results of the most sensitive of them are examined. Current half-life values for two-neutrino Double Beta Decay are presented together with the best available limits on neutrinoless Double Beta Decay and Decay with a Majoron emission. The most promising next-generation experiments with a Majorana-neutrino mass sensitivity of 0.01-0.1 eV are described.
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Double Beta Decay experiments: beginning of a new era
arXiv: Nuclear Experiment, 2012Co-Authors: A. S. BarabashAbstract:The review of current experiments on search and studying of Double Beta Decay processes is done. Results of the most sensitive experiments are discussed and values of modern limits on effective Majorana neutrino mass ($ ) are given. New results on two neutrino Double Beta Decay are presented. The special attention is given to new current experiments with mass of studied isotopes more than 100 kg, EXO--200 and KamLAND--Zen. These experiments open a new era in research of Double Beta Decay. In the second part of the review prospects of search for neutrinoless Double Beta Decay in new experiments with sensitivity to $ $ at the level of $\sim 0.01-0.1$ eV are discussed. Parameters and characteristics of the most perspective projects (CUORE, GERDA, MAJORANA, SuperNEMO, EXO, KamLAND--Zen, SNO+) are given.
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Double Beta Decay: present status
Physics of Atomic Nuclei, 2010Co-Authors: A. S. BarabashAbstract:The present status of Double Beta Decay experiments (including the search for $2\Beta^{+}$, EC$\Beta^{+}$ and ECEC processes) are reviewed. The results of the most sensitive experiments are discussed. Average and recommended half-life values for two-neutrino Double Beta Decay are presented. Conservative upper limits on effective Majorana neutrino mass and the coupling constant of the Majoron to the neutrino are established as $ $ at the level of (0.01-0.1) eV are considered.
Martin Hirsch - One of the best experts on this subject based on the ideXlab platform.
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LHC dijet constraints on Double Beta Decay
Physical Review D, 2015Co-Authors: Juan Carlos Helo, Martin HirschAbstract:We use LHC dijet data to derive constraints on neutrinoless Double Beta Decay. Upper limits on cross sections for the production of ``exotic'' resonances, such as a right-handed $W$ boson or a diquark, can be converted into lower limits on the Double Beta Decay half-life for fixed choices of other parameters. Constraints derived from run-I data are already surprisingly strong and complementary to results from searches using same-sign dileptons plus jets. For the case of the left-right symmetric model, in case no new resonance is found in future runs of the LHC and assuming ${g}_{L}={g}_{R}$, we estimate a lower limit on the Double Beta Decay half-life larger than ${10}^{27}$ yr can be derived from future dijet data, except in the window of relatively light right-handed neutrino masses in the range 0.5 MeV to 50 GeV. Part of this mass window will be tested in the upcoming SHiP experiment. We also discuss current and future limits on possible scalar diquark contributions to Double Beta Decay that can be derived from dijet data.
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Systematic decomposition of the neutrinoless Double Beta Decay operator
Journal of High Energy Physics, 2013Co-Authors: Florian Bonnet, Martin Hirsch, Toshihiko Ota, Walter WinterAbstract:We discuss the systematic decomposition of the dimension nine neutrinoless Double Beta Decay operator, focusing on mechanisms with potentially small contributions to neutrino mass, while being accessible at the LHC. We first provide a (d=9 tree-level) complete list of diagrams for neutrinoless Double Beta Decay. From this list one can easily recover all previously discussed contributions to the neutrinoless Double Beta Decay process, such as the celebrated mass mechanism or "exotics", such as contributions from left-right symmetric models, R-parity violating supersymmetry and leptoquarks. More interestingly, however, we identify a number of new possibilities which have not been discussed in the literature previously. Contact to earlier works based on a general Lorentz-invariant parametrisation of the neutrinoless Double Beta Decay rate is made, which allows, in principle, to derive limits on all possible contributions. We furthermore discuss possible signals at the LHC for mediators leading to the short-range part of the amplitude with one specific example. The study of such contributions would gain particular importance if there were a tension between different measurements of neutrino mass such as coming from neutrinoless Double Beta Decay and cosmology or single Beta Decay.
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Neutrinoless Double-Beta Decay and physics beyond the standard model
Journal of Physics G: Nuclear and Particle Physics, 2012Co-Authors: Frank F. Deppisch, Martin Hirsch, Heinrich PäsAbstract:Neutrinoless Double-Beta Decay is the most powerful tool to probe not only for Majorana neutrino masses but for lepton number violating physics in general. We discuss relations between lepton number violation, Double-Beta Decay and neutrino mass, review a general Lorentz-invariant parametrization of the Double-Beta Decay rate, highlight a number of different new physics models showing how different mechanisms can trigger Double-Beta Decay and, finally, discuss possibilities of discriminating and testing these models and mechanisms in complementary experiments.
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neutrinoless Double Beta Decay and physics beyond the standard model
arXiv: High Energy Physics - Phenomenology, 2012Co-Authors: Frank F. Deppisch, Martin Hirsch, Heinrich PäsAbstract:Neutrinoless Double Beta Decay is the most powerful tool to probe not only for Majorana neutrino masses but for lepton number violating physics in general. We discuss relations between lepton number violation, Double Beta Decay and neutrino mass, review a general Lorentz invariant parametrization of the Double Beta Decay rate, highlight a number of different new physics models showing how different mechanisms can trigger Double Beta Decay, and finally discuss possibilities to discriminate and test these models and mechanisms in complementary experiments.
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Phenomenology of neutrinoless Double Beta Decay
arXiv: High Energy Physics - Phenomenology, 2006Co-Authors: Martin HirschAbstract:Neutrinoless Double Beta Decay violates lepton number by two units, a positive observation therefore necessarily implies physics beyond the standard model. Here, three possible contributions to neutrinoless Double Beta Decay are briefly reviewed: (a) The mass mechanism and its connection to neutrino oscillations; (b) Left-right symmetric models and the lower limit on the right-handed W boson mass; and (c) R-parity violating supersymmetry. In addition, the recently published ``extended black box'' theorem is briefly discussed. Combined with data from oscillation experiments this theorem provides proof that the neutrinoless Double Beta Decay amplitude must receive a non-zero contribution from the mass mechanism, if neutrinos are indeed Majorana particles.
H. V. Klapdor-kleingrothaus - One of the best experts on this subject based on the ideXlab platform.
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Consequences of Neutrinoless Double Beta Decay and WMAP
Modern Physics Letters A, 2003Co-Authors: H. V. Klapdor-kleingrothaus, Utpal SarkarAbstract:Observation of the neutrinoless Double Beta Decay (0νββ) has established that there is lepton number violation in nature and the neutrino masses are Majorana in nature. It also gives the absolute mass of the neutrinos and discriminates between different models of neutrino masses. The allowed amount of lepton number violation puts severe constraints on some possible new physics beyond the standard model. The recent results from WMAP are consistent with the consequences of the neutrinoless Double Beta Decay. They improve some of these constraints very marginally, which we shall summarize here. We mention the new physics which is not affected by WMAP, and which could make the limits from the neutrinoless Double Beta Decay even consistent with much tighter future cosmological limits.
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Neutrinoless Double Beta Decay with scalar bilinears
Physics Letters B, 2003Co-Authors: H. V. Klapdor-kleingrothaus, Utpal SarkarAbstract:One possible probe to physics beyond the standard model is to look for scalar bilinears, which couple to two fermions of the standard model. We point out that the scalar bilinears allow new diagrams contributing to the neutrinoless Double Beta Decay. The neutrinoless Double Beta Decay lifetime would then give new constraints on the ratio of the masses of these scalars to their couplings to the fermions.
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Neutrinoless Double Beta Decay: Status of Evidence
Foundations of Physics, 2002Co-Authors: H. V. Klapdor-kleingrothaus, A. Dietz, I. V. KrivosheinaAbstract:The present experimental status in the search for neutrinoless Double Beta Decay is reviewed, with emphasis on the first indication for neutrinoless Double Beta Decay found in the HEIDELBERG-MOSCOW experiment, giving first evidence for lepton number violation and a Majorana nature of the neutrinos. Future perspectives of the field are briefly outlined.
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Status of Evidence for Neutrinoless Double Beta Decay
Foundations of Physics, 2002Co-Authors: H. V. Klapdor-kleingrothaus, A. Dietz, I. V. KrivosheinaAbstract:The present experimental status in the search for neutrinoless Double Beta Decay is reviewed, with emphasis on the first indication for neutrinoless Double Beta Decay found in the Heidelberg-Moscow experiment, giving first evidence for lepton number violation and a Majorana nature of the neutrinos. Future perspectives of the field are briefly outlined.
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New exotics in the Double Beta Decay contributions zoo
arXiv: High Energy Physics - Phenomenology, 2000Co-Authors: H. V. Klapdor-kleingrothaus, H. Päs, Utpal SarkarAbstract:We discuss the potential of neutrinoless Double Beta Decay for testing Lorentz invariance and the weak equivalence principle as well as contributions from dilaton exchange gravity in the neutrino sector. While neutrino oscillation bounds constrain the region of large mixing of the weak and gravitational eigenstates, we obtain new constraints on violations of Lorentz invariance and the equivalence principle from neutrinoless Double Beta Decay, applying even in the case of no mixing. Double Beta Decay thus probes a totally unconstrained region in the parameter space.
Utpal Sarkar - One of the best experts on this subject based on the ideXlab platform.
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Consequences of Neutrinoless Double Beta Decay and WMAP
Modern Physics Letters A, 2003Co-Authors: H. V. Klapdor-kleingrothaus, Utpal SarkarAbstract:Observation of the neutrinoless Double Beta Decay (0νββ) has established that there is lepton number violation in nature and the neutrino masses are Majorana in nature. It also gives the absolute mass of the neutrinos and discriminates between different models of neutrino masses. The allowed amount of lepton number violation puts severe constraints on some possible new physics beyond the standard model. The recent results from WMAP are consistent with the consequences of the neutrinoless Double Beta Decay. They improve some of these constraints very marginally, which we shall summarize here. We mention the new physics which is not affected by WMAP, and which could make the limits from the neutrinoless Double Beta Decay even consistent with much tighter future cosmological limits.
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Neutrinoless Double Beta Decay with scalar bilinears
Physics Letters B, 2003Co-Authors: H. V. Klapdor-kleingrothaus, Utpal SarkarAbstract:One possible probe to physics beyond the standard model is to look for scalar bilinears, which couple to two fermions of the standard model. We point out that the scalar bilinears allow new diagrams contributing to the neutrinoless Double Beta Decay. The neutrinoless Double Beta Decay lifetime would then give new constraints on the ratio of the masses of these scalars to their couplings to the fermions.
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New exotics in the Double Beta Decay contributions zoo
arXiv: High Energy Physics - Phenomenology, 2000Co-Authors: H. V. Klapdor-kleingrothaus, H. Päs, Utpal SarkarAbstract:We discuss the potential of neutrinoless Double Beta Decay for testing Lorentz invariance and the weak equivalence principle as well as contributions from dilaton exchange gravity in the neutrino sector. While neutrino oscillation bounds constrain the region of large mixing of the weak and gravitational eigenstates, we obtain new constraints on violations of Lorentz invariance and the equivalence principle from neutrinoless Double Beta Decay, applying even in the case of no mixing. Double Beta Decay thus probes a totally unconstrained region in the parameter space.
Fedor Šimkovic - One of the best experts on this subject based on the ideXlab platform.
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Searching for New Physics in Two-Neutrino Double Beta Decay.
Physical review letters, 2020Co-Authors: Frank F. Deppisch, Lukas Graf, Fedor ŠimkovicAbstract:Motivated by nonzero neutrino masses and the possibility of new physics discovery, a number of experiments search for neutrinoless Double Beta Decay. While hunting for this hypothetical nuclear process, a significant amount of two-neutrino Double Beta Decay data have become available. Although these events are regarded and studied mostly as the background of neutrinoless Double Beta Decay, they can also be used to probe physics beyond the standard model. In this Letter, we show how the presence of right-handed leptonic currents would affect the energy distribution and angular correlation of the outgoing electrons in two-neutrino Double Beta Decay. Consequently, we estimate constraints imposed by currently available data on the existence of right-handed neutrino interactions without having to assume their nature. In this way, our results complement the bounds coming from the nonobservation of neutrinoless Double Beta Decay as they limit also the exotic interactions of Dirac neutrinos. We perform a detailed calculation of two-neutrino Double Beta Decay under the presence of exotic (axial-) vector currents, and we demonstrate that current experimental searches can be competitive to existing limits.
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Neutrinoless Double Beta Decay: Theoretical challenges
Nuclear and Particle Physics Proceedings, 2015Co-Authors: Fedor ŠimkovicAbstract:Abstract The recent progress in theoretical description of the neutrinoless Double Beta Decay (0 νββ -Decay) is briefly reviewed. A possible effect of nuclear medium on exchange of three light neutrinos is addressed. It is shown that non-standard neutrino interaction generates in-medium Majorana neutrino masses, which influences the 0 νββ -Decay rate. A subject of interest is also a problem of reliable calculation of the 0 νββ -Decay nuclear matrix elements. An impact of the quenching of the axial-vector coupling constant on Double Beta Decay processes is discussed. A connection between two-neutrino and neutrinoless Double Beta Decay nuclear matrix elements is analyzed.
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Double Beta Decay
Journal of Physics G: Nuclear and Particle Physics, 1998Co-Authors: Amand Faessler, Fedor ŠimkovicAbstract:We review the recent developments in the field of nuclear Double Beta Decay, which is presently an important topic in both nuclear and particle physics. The mechanism of lepton number violation within the neutrinoless Double Beta Decay is discussed in context of the problem of neutrino mixing and the R-parity violating supersymmetric extensions of the Standard model. The problem of reliable determination of the nuclear matrix elements governing both two-neutrino and neutrinoless modes of the Double Beta Decay is addressed. The validity of different approximation schemes in the considered nuclear structure studies is analyzed and the role of the Pauli exclusion principle for a correct treatment of nuclear matrix elements is emphasized. The constraints on different lepton number violating parameters like effective electron neutrino mass, effective right-handed weak interaction parameters, effective Majoron coupling constant and R-parity violating SUSY parameters are derived from the best presently available experimental limits on the half life of neutrinoless mode of this process.