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Journal articles on the topic 'Neutrinole'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

Khatun, Amina, та Fedor Šimkovic. "Effective Majorana Neutrino Mass for ΔL = 2 Neutrino Oscillations". Symmetry 14, № 7 (2022): 1383. http://dx.doi.org/10.3390/sym14071383.

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It is well known that the observations of neutrinoless double-beta decay prove the Majorana nature of the neutrino. However, with specific values of Majorana phases, the effective Majorana neutrino mass to be estimated from the observation of neutrinoless double-beta decay experiments is strongly suppressed if the neutrino mass pattern adheres to a normal ordering. In this case, double-beta decay might not be observed even though the neutrino is Majorana in nature. We show if neutrinos oscillate to antineutrinos in their propagation; then, the observation of this oscillation proves that neutri

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2

Lu, Jianlong, Aik Hui Chan, and Choo Hiap Oh. "A Phenomenological Model of Effectively Oscillating Massless Neutrinos and Its Implications." EPJ Web of Conferences 240 (2020): 02002. http://dx.doi.org/10.1051/epjconf/202024002002.

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We discuss an alternative picture of neutrino oscillation. In this phenomenological model, the flavor-changing phenomena of massless neutrinos arise from scattering processes between neutrinos and four types of undetected spin-0 massive particles pervading throughout the Universe, instead of neutrinos’ own nature. These scattering processes are kinematically similar to Compton scattering. One type of left-handed massless sterile neutrino is needed in order to reproduce the neutrino oscillation modes predicted in the theory of neutrino mixing. Implications of our model include the existence of

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3

Faessler, A. "Super-Kamiokande neutrino oscillations and the supersymmetric model." HNPS Proceedings 9 (February 11, 2020): 14. http://dx.doi.org/10.12681/hnps.2773.

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The standard model predicts a ratio of 2 for the number of atmospheric muon to electron neutrinos, while super-Kamiokande and others measure a much smaller value (1.30±0.02 for super-Kamiokande). Super-Kamiokande is also able to measure roughly the direction and the energy of the neutrinos. The zenith-angle dependence for the muon neutrinos suggests that the muon neutrinos oscillate into a third neutrino species, either into the r neutrino or a sterile neutrino. This finding is inves- tigated within the supersymmetric model. The neutrinos mix with the neutralinos, this meaning the wino, the bi

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4

BILENKY, S. M. "NEUTRINOS: A BRIEF REVIEW." Modern Physics Letters A 19, no. 33 (2004): 2451–77. http://dx.doi.org/10.1142/s0217732304015944.

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The major steps in the development of our knowledge about neutrinos are reviewed. The basics of neutrino oscillation formalism is presented. Neutrino oscillations in the framework of three-neutrino mixing are considered. The evidence for neutrino oscillations is discussed. Neutrinoless double β-decay is briefly considered.

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5

Giunti, Carlo, and Thierry Lasserre. "eV-Scale Sterile Neutrinos." Annual Review of Nuclear and Particle Science 69, no. 1 (2019): 163–90. http://dx.doi.org/10.1146/annurev-nucl-101918-023755.

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We address the phenomenology of light sterile neutrinos, with an emphasis on short-baseline neutrino oscillations. After reviewing the observed short-baseline neutrino oscillation anomalies, we discuss the global fit of the data and the current appearance–disappearance tension. We also review briefly the effects of light sterile neutrinos in β decay, neutrinoless double-β decay, and cosmology. Finally, we discuss future perspectives of the search for the effects of eV-scale sterile neutrinos.

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6

Verma, Rishu, Monal Kashav, Ankush B, Gazal Sharma, Surender Verma, and B. C. Chauhan. "Texture One Zero Model Based on A4 Flavor Symmetry and its Implications to Neutrinoless Double Beta Decay." Journal of Nuclear Physics, Material Sciences, Radiation and Applications 9, no. 1 (2021): 67–71. http://dx.doi.org/10.15415/jnp.2021.91012.

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Neutrinos are perhaps the most elusive particles in our Universe. Neutrino physics could be counted as a benchmark for various new theories in elementary particle physics and also for the better understanding of the evolution of the Universe. To complete the neutrino picture, the missing information whether it is about their mass or their nature that the neutrinos are Majorana particles could be provided by the observation of a process called neutrinoless double beta (0νββ) decay. Neutrinoless double beta decay is a hypothesised nuclear process in which two neutrons simultaneously decay into p

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7

Francis, Ng K., and Ankur Nath. "The Effects of Majorana Phases in Estimating the Masses of Neutrinos." International Journal of Modern Physics: Conference Series 47 (January 2018): 1860100. http://dx.doi.org/10.1142/s201019451860100x.

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Majorana CP violating phases coming from heavy right-handed Majorana mass matrices([Formula: see text]) are considered to estimate the masses of neutrinos. The effects of phases on quasi-degenerate neutrinos mass matrix obeying [Formula: see text] symmetry predicts the results consistent with observations for (i) solar mixing angle([Formula: see text]) below TBM, (ii) absolute neutrino mass parameters[[Formula: see text]] in neutrinoless double beta([Formula: see text]) decay, and (iii) cosmological upper bound [Formula: see text]. Analysis is carried out through parameterization of light left

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8

Kudenko, Yury. "New results and perspectives in neutrino physics." EPJ Web of Conferences 212 (2019): 01005. http://dx.doi.org/10.1051/epjconf/201921201005.

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A brief review of new results and perspectives in neutrino physics is presented. An emphasis on a search for CP violation in neutrino oscillations and a search for sterile neutrinos is given. Status of measurement of the direct neutrino mass measurement and searches for neutrinoless double beta decay are also discussed.

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9

Petcov, S. T. "The Nature of Massive Neutrinos." Advances in High Energy Physics 2013 (2013): 1–20. http://dx.doi.org/10.1155/2013/852987.

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The compelling experimental evidences for oscillations of solar, reactor, atmospheric, and accelerator neutrinos imply the existence of 3-neutrino mixing in the weak charged lepton current. The current data on the 3-neutrino mixing parameters are summarised and the phenomenology of 3-νmixing is reviewed. The properties of massive Majorana neutrinos and of their various possible couplings are discussed in detail. Two models of neutrino mass generation with massive Majorana neutrinos—the type I see-saw and the Higgs triplet model—are briefly reviewed. The problem of determining the nature, Dirac

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10

Okada, Nobuchika, and Osamu Yasuda. "A Sterile Neutrino Scenario Constrained By Experiments and Cosmology." International Journal of Modern Physics A 12, no. 21 (1997): 3669–94. http://dx.doi.org/10.1142/s0217751x97001894.

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We analyze a scheme in which three active neutrinos and one sterile neutrino account for the solar, the atmospheric and the LSND neutrino anomalies in a model-independent way. It is shown that if the equivalent number, Nν, of the light neutrino species is less than 4, then the constraints from these anomalies, accelerator and reactor experiments and big bang nucleosynthesis force a general 4 × 4 mixing matrix to be effectively split into two 2 × 2 matrices. If these neutrinos are of the Majorana type, then negative results of neutrinoless double beta decay experiments imply that the total mass

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11

DEV, S., and SANJEEV KUMAR. "NEUTRINO PARAMETER SPACE FOR A VANISHING ee ELEMENT IN THE NEUTRINO MASS MATRIX." Modern Physics Letters A 22, no. 19 (2007): 1401–10. http://dx.doi.org/10.1142/s0217732307021767.

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The consequences of a texture zero at the ee entry of neutrino mass matrix in the flavor basis, which also implies a vanishing effective Majorana mass for neutrinoless double beta decay, have been studied for Majorana neutrinos. The neutrino parameter space under this condition has been constrained in the light of all available neutrino data including the CHOOZ bound on [Formula: see text].

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12

CHAKRABORTTY, JOYDEEP, MOUMITA DAS, and SUBHENDRA MOHANTY. "CONSTRAINTS ON TeV SCALE MAJORANA NEUTRINO PHENOMENOLOGY FROM THE VACUUM STABILITY OF THE HIGGS." Modern Physics Letters A 28, no. 11 (2013): 1350032. http://dx.doi.org/10.1142/s0217732313500326.

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The vacuum stability condition of the Standard Model (SM) Higgs potential with mass in the range of 124–127 GeV puts an upper bound on the Dirac mass of the neutrinos. We study this constraint with the right-handed neutrino masses up to TeV scale. The heavy neutrinos contribute to ΔL = 2 processes like neutrinoless double beta decay and same-sign-dilepton (SSD) production in the colliders. The vacuum stability criterion also restricts the light-heavy neutrino mixing and constrains the branching ratio (BR) of lepton flavor-violating process, like μ→eγ mediated by the heavy neutrinos. We show th

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13

XING, ZHI-ZHONG. "FLAVOR MIXING AND CP VIOLATION OF MASSIVE NEUTRINOS." International Journal of Modern Physics A 19, no. 01 (2004): 1–79. http://dx.doi.org/10.1142/s0217751x04016969.

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We present an overview of recent progress in the phenomenological study of neutrino masses, lepton flavor mixing and CP violation. We concentrate on the model-independent properties of massive neutrinos, both in vacuum and in matter. Current experimental constraints on the neutrino mass spectrum and the lepton flavor mixing parameters are summarized. The Dirac- and Majorana-like phases of CP violation, which are associated respectively with the long-baseline neutrino oscillations and the neutrinoless double beta decay, are discussed in detail. The seesaw mechanism, the leptogenesis scenario an

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14

Merle, Alexander, and Werner Rodejohann. "Getting Information on|Ue3|2from Neutrinoless Double Beta Decay." Advances in High Energy Physics 2007 (2007): 1–15. http://dx.doi.org/10.1155/2007/82674.

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We consider the possibility to gain information on the lepton mixing matrix element|Ue3|from an improved experimental limit on the effective neutrino mass governing neutrinoless double beta decay. We show that typically a lower limit on|Ue3|as a function of the smallest neutrino mass can be set. Furthermore, we give the values of the sum of neutrino masses and|Ue3|which are allowed and forbidden by an experimental upper limit on the effective mass. Alternative explanations for neutrinoless double beta decay, Dirac neutrinos or unexplained cosmological features would be required if future measu

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15

WANG, YIFANG. "RECENT RESULTS OF NON-ACCELERATOR-BASED NEUTRINO EXPERIMENTS." International Journal of Modern Physics A 20, no. 22 (2005): 5244–53. http://dx.doi.org/10.1142/s0217751x05028752.

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Recent results of non-accelerator-based experiments, including those of solar, atmospheric, and reactor neutrinos oscillations, neutrinoless double-beta decays, and neutrino magnetic moments, are reviewed. Future projects and their respective prospects are summarized.

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16

Liu, Jun-Hao, and Shun Zhou. "Another look at the impact of an eV-mass sterile neutrino on the effective neutrino mass of neutrinoless double-beta decays." International Journal of Modern Physics A 33, no. 02 (2018): 1850014. http://dx.doi.org/10.1142/s0217751x18500148.

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The possible existence of an eV-mass sterile neutrino, slightly mixing with ordinary active neutrinos, is not yet excluded by neutrino oscillation experiments. Assuming neutrinos to be Majorana particles, we explore the impact of such a sterile neutrino on the effective neutrino mass of neutrinoless double-beta decays [Formula: see text], where [Formula: see text] and [Formula: see text] (for [Formula: see text]) denote respectively the absolute masses and the first-row elements of the [Formula: see text] neutrino flavor mixing matrix [Formula: see text], for which a full parametrization invol

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17

Klapdor-Kleingrothaus, H. V., and U. Sarkar. "Consequences of Neutrinoless Double Beta Decay and WMAP." Modern Physics Letters A 18, no. 32 (2003): 2243–54. http://dx.doi.org/10.1142/s0217732303011988.

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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. W

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18

Grange, Joseph, and Teppei Katori. "Charged current quasi-elastic cross-section measurements in MiniBooNE." Modern Physics Letters A 29, no. 12 (2014): 1430011. http://dx.doi.org/10.1142/s0217732314300110.

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The neutrino-induced charged-current quasi-elastic (CCQE, νl + n → l- + p or [Formula: see text]) interaction is the most abundant interaction around 1 GeV, and it is the most fundamental channel to study neutrino oscillations. Recently, MiniBooNE published both muon neutrino1 and muon anti-neutrino2 double differential cross-sections on carbon. In this review, we describe the details of these analyses and include some historical remarks.

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19

CREMONESI, OLIVIERO. "NEUTRINOLESS DOUBLE BETA DECAY." International Journal of Modern Physics: Conference Series 12 (January 2012): 80–89. http://dx.doi.org/10.1142/s2010194512006289.

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Neutrinoless double beta decay (ββ(0ν)) is presently the only practical tool for probing the character of neutrinos. In case neutrinos are Majorana particles ββ(0ν) can provide also fundamental informations on their absolute mass scale. The present status of experiments searching for ββ(0ν) is reviewed and the most relevant results discussed. A possibility to observe ββ(0ν) at a neutrino mass scale in the range 10-50 meV looks possible according to our present knowledge of the neutrino masses and mixing parameters. A review of the future projects and of the most relevant parameters contributin

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20

Berger, Micheal S., and Maria Dawid. "A Froggatt–Nielsen flavor model for neutrino physics." International Journal of Modern Physics A 34, no. 19 (2019): 1950102. http://dx.doi.org/10.1142/s0217751x19501021.

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Superheavy neutrinos can, via the seesaw model, provide a mechanism for lepton number violation. If they are combined with flavor violation as characterized by the Froggatt–Nielsen mechanism, then the phenomenology for the neutrinos in oscillation experiments, neutrinoless double beta decay, and other experiments can be described by a relatively few number of parameters. We describe the low-energy neutrino mass matrix and show that the results are consistent with currently available data.

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21

Lesgourgues, Julien, and Sergio Pastor. "Neutrino Mass from Cosmology." Advances in High Energy Physics 2012 (2012): 1–34. http://dx.doi.org/10.1155/2012/608515.

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Neutrinos can play an important role in the evolution of the universe, modifying some of the cosmological observables. 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 stru

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22

HE, XIAO-GANG, and A. ZEE. "GEOMETRIC MEAN NEUTRINO MASS RELATION." Modern Physics Letters A 22, no. 25n28 (2007): 2107–12. http://dx.doi.org/10.1142/s0217732307025352.

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Present experimental data from neutrino oscillations have provided much information about the neutrino mixing angles. Since neutrino oscillations only determine the mass squared differences [Formula: see text], the absolute values for neutrino masses mi, can not be determined using data just from oscillations. In this work we study implications on neutrino masses from a geometric mean mass relation [Formula: see text] which enables one to determined the absolute masses of the neutrinos. We find that the central values of the three neutrino masses and their 2σ errors to be m1 = (1.58 ± 0.18) me

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23

BARGER, V., D. MARFATIA, and K. WHISNANT. "PROGRESS IN THE PHYSICS OF MASSIVE NEUTRINOS." International Journal of Modern Physics E 12, no. 05 (2003): 569–647. http://dx.doi.org/10.1142/s0218301303001430.

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The current status of the physics of massive neutrinos is reviewed with a forward-looking emphasis. The article begins with the general phenomenology of neutrino oscillations in vacuum and matter and documents the experimental evidence for oscillations of solar, reactor, atmospheric and accelerator neutrinos. Both active and sterile oscillation possibilities are considered. The impact of cosmology (BBN, CMB, leptogenesis) and astrophysics (supernovae, highest energy cosmic rays) on neutrino observables and vice versa, is evaluated. The predictions of grand unified, radiative and other models o

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24

Valle, José W. F. "Status and implications of neutrino masses: A brief panorama." International Journal of Modern Physics A 30, no. 13 (2015): 1530034. http://dx.doi.org/10.1142/s0217751x15300343.

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With the historic discovery of the Higgs boson our picture of particle physics would have been complete were it not for the neutrino sector and cosmology. I briefly discuss the role of neutrino masses and mixing upon gauge coupling unification, electroweak breaking and the flavor sector. Time is ripe for new discoveries such as leptonic CP violation, charged lepton flavor violation and neutrinoless double beta decay. Neutrinos could also play a role in elucidating the nature of dark matter and cosmic inflation.

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25

Vivekanand, P. Verma, and K. Chaturvedi. "Limits on Effective Masses of Light and Heavy Majorana Neutrinos for Positron Emitting Modes of Double Beta Decay." Journal of Scientific Research 14, no. 1 (2022): 1–10. http://dx.doi.org/10.3329/jsr.v14i1.50390.

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Double beta decay is a rare weak interaction process in which two identical nucleons inside the nucleus decay with or without the emission of neutrinos. If the neutrinoless double beta decay is observed, the (e+DBD) processes will play a crucial role in discriminating the finer issues like the dominance of Majorana neutrino mass or the right-handed current. In the present work, we have obtained the limits on the effective mass of light and heavy Majorana neutrinos for the electron-positron conversion and double positron-emitting modes of 96Ru, 106Cd, 124Xe, and 130Ba isotopes, using the nuclea

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26

PATGIRI, MAHADEV, and N. NIMAI SINGH. "RIGHT-HANDED MAJORANA NEUTRINO MASS MATRICES FOR GENERATING BIMAXIMAL MIXINGS IN DEGENERATE AND INVERTED MODELS OF NEUTRINOS." International Journal of Modern Physics A 18, no. 05 (2003): 743–53. http://dx.doi.org/10.1142/s0217751x03014022.

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An attempt is made to generate the bimaximal mixings of the three species of neutrinos from the textures of the right-handed Majorana neutrino mass matrices. We extend our earlier work in this paper for the generation of the nearly degenerate as well as the inverted hierarchical models of the left-handed Majorana neutrino mass matrices using the non-diagonal textures of the right-handed Majorana neutrino mass matrices and the diagonal form of Dirac neutrino mass matrices, within the framework of the see-saw mechanism in a model independent way. Such Majorana neutrino mass models are important

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27

Chianese, Marco, Damiano F. G. Fiorillo, Gennaro Miele, and Stefano Morisi. "Investigating two heavy neutral leptons neutrino seesaw mechanism at SHiP." International Journal of Modern Physics A 34, no. 08 (2019): 1950047. http://dx.doi.org/10.1142/s0217751x19500477.

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One of the main purposes of SHiP experiment is to shed light on neutrino mass generation mechanisms like the so-called seesaw. We consider a minimal type-I seesaw neutrino mass mechanism model with two heavy neutral leptons (right-handed or sterile neutrinos) with arbitrary masses. Extremely high active-sterile mixing angle requires a correlation between the phases of the Dirac neutrino couplings. Actual experimental limits on the half-life of neutrinoless double beta decay [Formula: see text]-rate on the active-sterile mixing angle are not significative in constraining the masses or the mixin

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28

HEUSCH, CLEMENS A., and PETER MINKOWSKI. "A STRATEGY FOR DISCOVERING HEAVY NEUTRINOS." International Journal of Modern Physics A 11, no. 09 (1996): 1607–11. http://dx.doi.org/10.1142/s0217751x96000791.

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Same-sign lepton collisions in the TeV energy range may well have the unique capability to search for clear signals for the exchange of heavy Majorana neutrinos. Lepton-flavor-violating transitions e−e−→W−W− can thus contribute to the understanding of two unsolved riddles in particle physics: the neutrino mass problem and the question of the Dirac or Majorana character of heavy neutrinos. This search is not similarly accessible to such effects as neutrinoless double beta decay. The resulting experimental signatures are hard to miss.

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29

SENJANOVIĆ, GORAN. "SEESAW AT LHC THROUGH LEFT–RIGHT SYMMETRY." International Journal of Modern Physics A 26, no. 09 (2011): 1469–91. http://dx.doi.org/10.1142/s0217751x1105302x.

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I argue that LHC may shed light on the nature of neutrino mass through the probe of the seesaw mechanism. The smoking gun signature is lepton number violation through the production of same sign lepton pairs, a collider analogy of the neutrinoless double beta decay. I discuss this in the context of left–right symmetric theories, which led originally to neutrino mass and the seesaw mechanism. A WR gauge boson with a mass in a few TeV region could easily dominate neutrinoless double beta decay, and its discovery at LHC would have spectacular signatures of parity restoration and lepton number vio

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30

Nieuwenhuizen, Theodorus Maria. "The Standard Model of Particle Physics with Diracian Neutrino Sector." Symmetry 11, no. 8 (2019): 994. http://dx.doi.org/10.3390/sym11080994.

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The minimally extended standard model of particle physics contains three right handed or sterile neutrinos, coupled to the active ones by a Dirac mass matrix and mutually by a Majorana mass matrix. In the pseudo-Dirac case, the Majorana terms are small and maximal mixing of active and sterile states occurs, which is generally excluded for solar neutrinos. In a “Diracian” limit, the physical masses become pairwise degenerate and the neutrinos attain a Dirac signature. Members of a pair do not oscillate mutually so that their mixing can be undone, and the standard neutrino model follows as a lim

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31

Kotila, Jenni. "Rare weak decays and neutrino mass." Journal of Physics: Conference Series 2453, no. 1 (2023): 012012. http://dx.doi.org/10.1088/1742-6596/2453/1/012012.

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Abstract The question whether neutrinos are Majorana fermions (i.e., their own anti-particles) remains among the most fundamental open questions of subatomic physics. If neutrinos are Majorana particles it would revolutionize our understanding of physics. Although neutrinoless double beta decay, 0νββ, was proposed more than 80 years ago to establish the nature of neutrinos, it remains the most sensitive probe into the non-conservation of lepton number. 0νββ-decay is a postulated extremely slow and yet unobserved radioactive process in which two neutrons (or protons) inside a nucleus transform

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32

GÓŹDŹ, MAREK, та WIESŁAW A. KAMIŃSKI. "SUPPRESSION OF 0ν2β DECAY FROM CP VIOLATION". International Journal of Modern Physics E 16, № 02 (2007): 561–65. http://dx.doi.org/10.1142/s0218301307005995.

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The observed phenomenon of neutrino oscillations is interpreted as the proof that neutrinos must have mass. As this is true for the neutrinos in the mass basis, the mass matrix in the flavor (weak) basis may still contain zeros. This can happen if the CP violating phases, usually neglected, come into play and result in suppression of processes which half-life depends on the masses of νe, νμ, or ντ. In the present paper we investigate the possibility of such suppression of the neutrinoless double beta decay (0ν2β).

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33

Hernandez-Molinero, Beatriz, Raul Jimenez, and Carlos Peña Garay. "Distinguishing Dirac vs. Majorana neutrinos: a cosmological probe." Journal of Cosmology and Astroparticle Physics 2022, no. 08 (2022): 038. http://dx.doi.org/10.1088/1475-7516/2022/08/038.

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Abstract Cosmic background neutrinos (CνB) helicity composition is different for Dirac or Majorana neutrinos making detectors based on CνB capture sensitive to the nature of neutrinos. We calculate, for the first time, the helicity changes of neutrinos crossing dark matter fields, to quantitatively calculate this effect on the capture rate. We show that a fraction of neutrinos change their helicity, regardless of them being deflected by a void or a dark matter halo. The average signal from the 100 most massive voids or halos in a Gpc3 gives a prediction that if neutrinos are Dirac, the density

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AKASLAN, S., and A. U. YILMAZER. "EFFECTS OF CP VIOLATING PHASES ON THE INVERSE NEUTRINOLESS DOUBLE BETA SCATTERING e-e- → W-W-." Modern Physics Letters A 27, no. 14 (2012): 1250053. http://dx.doi.org/10.1142/s0217732312500538.

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The most important open problems of the today's neutrino physics are the absolute values of the neutrino masses, the determination of the Dirac or the Majorana character and better measurements of the mixing matrix elements. Results of the neutrino oscillations experiments strongly confirm that the neutrinos have nonzero masses. Experiments give information about the differences between the squares of the masses but not any knowledge on their absolute values. Similarly neutrino oscillation phenomena does not help us to understand their Dirac or Majorana character. One of the processes that cou

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35

Loverde, Marilena, and Zachary J. Weiner. "Massive neutrinos and cosmic composition." Journal of Cosmology and Astroparticle Physics 2024, no. 12 (2024): 048. https://doi.org/10.1088/1475-7516/2024/12/048.

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Abstract Cosmological data probe massive neutrinos via their effects on the geometry of the Universe and the growth of structure, both of which are degenerate with the late-time expansion history. We clarify the nature of these degeneracies and the individual roles of both probes in neutrino mass inference. Geometry is strongly sensitive to neutrino masses: within ΛCDM, the primary cosmic microwave background anisotropies alone impose that the matter fraction Ω m must increase fivefold with increasing neutrino mass. Moreover, large-scale structure observables, like weak lensing of the CMB, are

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Das, Pritam, and Mrinal Kumar Das. "Phenomenology of keV sterile neutrino in minimal extended seesaw." International Journal of Modern Physics A 35, no. 22 (2020): 2050125. http://dx.doi.org/10.1142/s0217751x20501250.

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We explore the possibility of a single generation of keV scale sterile neutrino [Formula: see text] as a dark matter candidate within the minimal extended seesaw (MES) framework and its influence in neutrinoless double beta decay [Formula: see text] study. Three hierarchical right-handed neutrinos were considered to explain neutrino mass. We also address baryogenesis via the mechanism of thermal leptogenesis considering the decay of the lightest RH neutrino to a lepton and Higgs doublet. A generic model based on [Formula: see text] flavor symmetry is constructed to explain both normal and inve

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37

Yu, C. H., S. I. Alvis, I. J. Arnquist, et al. "The Majorana Demonstrator Status and Preliminary Results." EPJ Web of Conferences 178 (2018): 01006. http://dx.doi.org/10.1051/epjconf/201817801006.

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The Majorana Collaboration is using an array of high-purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. Searches for neutrinoless double-beta decay are understood to be the only viable experimental method for testing the Majorana nature of the neutrino. Observation of this decay would imply violation of lepton number, that neutrinos are Majorana in nature, and provide information on the neutrino mass. The Majorana Demonstrator comprises 44.1 kg of p-type point-contact Ge detectors (29.7 kg enriched in 76Ge) surrounded by a low-background shield system. The experiment ach

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38

Pagliaroli, Giulia, and Christoph A. Ternes. "Observing neutrinos from failed Supernovae at LNGS." Journal of Cosmology and Astroparticle Physics 2024, no. 06 (2024): 022. http://dx.doi.org/10.1088/1475-7516/2024/06/022.

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Abstract We discuss the possibility to observe neutrinos emitted from a failed core collapse Supernova in the various experiments at Laboratori Nazionali del Gran Sasso. We show that the veto regions of dark matter and neutrinoless double beta decay experiments can be used as a network of small detectors to measure Supernova neutrinos. In addition we show that this network can measure very precisely the moment of black hole formation, which can be then used in the nearby VIRGO detector and future Einstein Telescope, in case the Sardinia site is selected, to look for the gravitational wave coun

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KLAPDOR-KLEINGROTHAUS, H. V., and U. SARKAR. "IMPLICATIONS OF OBSERVED NEUTRINOLESS DOUBLE BETA DECAY." Modern Physics Letters A 16, no. 38 (2001): 2469–82. http://dx.doi.org/10.1142/s0217732301005850.

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Recently a positive indication of the neutrinoless double beta decay has been announced. We study the implications of this result taking into consideration earlier results on atmospheric neutrinos and solar neutrinos. We also include in our discussions the recent results from SNO and K2K. We point out that on the confidence level given for the double beta signal, the neutrino mass matrices are now highly constrained. All models predicting Dirac masses are ruled out and leptogenesis becomes a natural choice. Only the degenerate and the inverted hierarchical solutions are allowed for the three-g

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Duyang, Hongyue, Teng Li, Jiaxi Liu, et al. "A multi-purpose reconstruction method based on machine learning for atmospheric neutrinos at JUNO." EPJ Web of Conferences 295 (2024): 03002. http://dx.doi.org/10.1051/epjconf/202429503002.

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The Jiangmen Underground Neutrino Observatory (JUNO) experiment is designed to measure the neutrino mass ordering (NMO) using a 20-kton liquid scintillator (LS) detector. Besides the precise measurement of the reactor neutrino’s oscillation spectrum, an atmospheric neutrino oscillation measurement in JUNO offers independent sensitivity for NMO, which can potentially increase JUNO’s total sensitivity in a joint analysis. In this contribution, we present a novel multi-purpose reconstruction method for atmospheric neutrinos in JUNO at few-GeV based on a machine learning technique. This method ext

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Di Grezia, Elisabetta, Salvatore Esposito, and Adele Naddeo. "Measuring a Mass: The Puzzling History of an Elusive Particle." Universe 10, no. 8 (2024): 317. http://dx.doi.org/10.3390/universe10080317.

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Since Pauli’s hypothesis of their existence in 1930, neutrinos never ceased to bring into play novel ideas and to add new pieces of physics in the whole picture of fundamental interactions. They are only weakly interacting and, at odds with Standard Model’s predictions, have a mass less than one millionth of the electron mass, which makes the investigation of their properties very challenging. The issue of the measurement of neutrino’s rest mass gained a wider and wider consensus since its discovery through neutrino oscillations in 1998. Various neutrino sources are available for experiments,

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NISHIURA, HIROYUKI, KOUICHI MATSUDA, and TAKESHI FUKUYAMA. "CONSTRAINTS OF MIXING ANGLES FROM LEPTON NUMBER VIOLATING PROCESSES." Modern Physics Letters A 14, no. 06 (1999): 433–45. http://dx.doi.org/10.1142/s0217732399000493.

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We discuss the constraints of lepton mixing angles from lepton number violating processes such as neutrinoless double beta decay, μ--e+ conversion and K decay, K-→π+μ-μ- which are allowed only if neutrinos are Majorana particles. The rates of these processes are proportional to the averaged neutrino mass defined by [Formula: see text] in the absence of right-handed weak coupling. Here a, b(j) are flavor(mass) eigenstates and Uaj is the left-handed lepton mixing matrix. We give general conditions imposed on <mν>ab in terms of mi, lepton mixing angles and CP violating phases (three phases

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Caravaca, J. "SNO+ status and prospects." International Journal of Modern Physics A 35, no. 34n35 (2020): 2044013. http://dx.doi.org/10.1142/s0217751x20440133.

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SNO+ is a multi-purpose experiment whose main goal is to study the nature of the neutrino mass through the observation of neutrinoless double-beta decay. Detection of this rare process would indicate that neutrinos are elementary Majorana particles, proving that lepton number is not conserved. The SNO+ detector will operate in three distinct phases with different target materials: water, pure liquid scintillator and tellurium-loaded liquid scintillator. During the water phase, the external backgrounds were confirmed to be within expectation, new limits on specific channels of invisible nucleon

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OBARA, MIDORI, and ZHI-ZHONG XING. "GENERALIZED FUKUGITA–TANIMOTO–YANAGIDA NEUTRINO MASS ANSATZ." International Journal of Modern Physics E 16, no. 05 (2007): 1405–16. http://dx.doi.org/10.1142/s0218301307006769.

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We generalize the Fukugita–Tanimoto–Yanagida ansatz by allowing the masses of three heavy right-handed Majorana neutrinos, Mi (i = 1,2,3), to be partially non-degenerate and search for the parameter space which can be consistent with the current neutrino oscillation data, for three non-degenerate mass cases (A) M3 = M2 ≠ M1, (B) M2 = M1 ≠ M3 and (C) M1 = M3 ≠ M2. We also examine the effect of the deviation from the complete mass degeneracy in each case. Finally, we obtain the numerical constraints on three light neutrino masses, three neutrino mixing angles and three CP-violating phases, toget

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KEUM, YONG-YEON. "NEUTRINO MASS BOUNDS." International Journal of Modern Physics: Conference Series 01 (January 2011): 140–50. http://dx.doi.org/10.1142/s2010194511000195.

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We investigate the way how the total mass sum of neutrinos can be constrained from the neutrinoless double beta decay and cosmological probes with cosmic microwave background (WMAP 3-year results), large scale structures including 2dFGRS and SDSS data sets. First we discuss, in brief, on the current status of neutrino mass bounds from neutrino beta decays and cosmic constrain within the flat ΛCMD model. In addition, we explore the interacting neutrino dark-energy model, where the evolution of neutrino masses is determined by quintessence scalar filed, which is responsable for cosmic accelerati

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Vien, Vo Van, та Hoang Ngoc Long. "Neutrino mixing with nonzero θ13 and CP violation in the 3-3-1 model based on A4 flavor symmetry". International Journal of Modern Physics A 30, № 21 (2015): 1550117. http://dx.doi.org/10.1142/s0217751x15501171.

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We propose a 3-3-1 model with neutral fermions based on [Formula: see text] flavor symmetry responsible for fermion masses and mixings with nonzero [Formula: see text]. To get realistic neutrino mixing, we just add a new [Formula: see text] triplet being in [Formula: see text] under [Formula: see text]. The neutrinos get small masses from two [Formula: see text] antisextets and one [Formula: see text] triplet. The model can fit the present data on neutrino masses and mixing as well as the effective mass governing neutrinoless double beta decay. Our results show that the neutrino masses are nat

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Horoi, Mihai. "Double Beta Decay: A Shell Model Approach." Physics 4, no. 4 (2022): 1135–49. http://dx.doi.org/10.3390/physics4040074.

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Studies of weak interaction in nuclei are important tools for testing different aspects of the fundamental symmetries of the Standard Model. Neutrinoless double beta decay offers an unique venue of investigating the possibility that neutrinos are Majorana fermions and that the lepton number conservation law is violated. Here, I use a shell model approach to calculate the nuclear matrix elements needed to extract the lepton-number-violating parameters of a few nuclei of experimental interest from the latest experimental lower limits of neutrinoless double beta decay half-lives. The analysis pre

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Andringa, S., E. Arushanova, S. Asahi, et al. "Current Status and Future Prospects of the SNO+ Experiment." Advances in High Energy Physics 2016 (2016): 1–21. http://dx.doi.org/10.1155/2016/6194250.

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SNO+ is a large liquid scintillator-based experiment located 2 km underground at SNOLAB, Sudbury, Canada. It reuses the Sudbury Neutrino Observatory detector, consisting of a 12 m diameter acrylic vessel which will be filled with about 780 tonnes of ultra-pure liquid scintillator. Designed as a multipurpose neutrino experiment, the primary goal of SNO+ is a search for the neutrinoless double-beta decay (0νββ) of130Te. In Phase I, the detector will be loaded with 0.3% natural tellurium, corresponding to nearly 800 kg of130Te, with an expected effective Majorana neutrino mass sensitivity in the

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KLAPDOR-KLEINGROTHAUS, H. V. "TO BE OR NOT TO BE? — FIRST EVIDENCE FOR NEUTRINOLESS DOUBLE-BETA DECAY." International Journal of Modern Physics A 18, no. 22 (2003): 4113–28. http://dx.doi.org/10.1142/s0217751x03017403.

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Double beta decay is indispensable to solve the question of the neutrino mass matrix together with ν oscillation experiments. Recent analysis of the most sensitive experiment since nine years - the HEIDELBERG-MOSCOW experiment in Gran-Sasso - yields a first indication for the neutrinoless decay mode. This result is the first evidence for lepton number violation and proves the neutrino to be a Majorana particle. We give the present status of the analysis in this report. It excludes several of the neutrino mass scenarios allowed from present neutrino oscillation experiments - only degenerate sce

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Vien, V. V. "Neutrino mass and mixing in the 3-3-1 model with neutral leptons based on D4flavor symmetry." Modern Physics Letters A 29, no. 23 (2014): 1450122. http://dx.doi.org/10.1142/s0217732314501223.

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We propose a new D4flavor model based on SU (3)C⊗ SU (3)L⊗ U (1)Xgauge symmetry responsible for fermion masses and mixings in which all fermion fields act only as singlets under D4which differs from our previous work. The neutrinos get small masses from two SU (3)Lanti-sextets and one SU (3)Ltriplet which are all in singlets under D4. If a SU (3)LHiggs triplet, lying in [Formula: see text] under D4, is considered as a perturbation the corresponding neutrino mass mixing matrix gets the most general form. In this case, the model can fit the most recent data on neutrino masses and mixing with non

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