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Artykuły w czasopismach na temat „Neutrino mass and mixing”

Autor: Grafiati

Data publikacji: 2 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

BILENKY, S. M., C. GIUNTI, and C. W. KIM. "FINALLY NEUTRINO HAS MASS." International Journal of Modern Physics A 15, no. 05 (2000): 625–50. http://dx.doi.org/10.1142/s0217751x00000318.

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The present status of the problem of neutrino mass, mixing and neutrino oscillations is briefly summarized. The evidence for oscillations of atmospheric neutrinos found recently in the Super-Kamiokande experiment is discussed. Indications in favor of neutrino oscillations obtained in solar neutrino experiments and in the accelerator LSND experiment are also considered. Implications of existing neutrino oscillation data for neutrino masses and mixing are discussed.

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2

KANG, KYUNGSIK, SIN KYU KANG, C. S. KIM, and SUN MYONG KIM. "NEUTRINO OSCILLATIONS AND LEPTON FLAVOR MIXING." Modern Physics Letters A 16, no. 33 (2001): 2169–75. http://dx.doi.org/10.1142/s0217732301005473.

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In view of the recent announcement on nonzero neutrino mass from Super-Kamiokande experiment, it would be very timely to investigate all the possible scenarios on masses and mixings of light neutrinos. Recently suggested mass matrix texture for the quark CKM mixing, which can be originated from the family permutation symmetry and its suitable breakings, is assumed for the neutrino mass matrix and determined by the four combinations of solar, atmospheric and LSND neutrino data and cosmological hot dark matter bound as input constraints. The charged-lepton mass matrix is assumed to be diagonal s

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3

Saez, M. M., O. Civitarese, and M. E. Mosquera. "Neutrino mixing in nuclear rapid neutron-capture processes." International Journal of Modern Physics E 29, no. 04 (2020): 2050022. http://dx.doi.org/10.1142/s0218301320500226.

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A possible mechanism for the formation of heavy-mass elements in supernovae is the rapid neutron-capture-mechanism ([Formula: see text]-process). It depends upon the electron-fraction [Formula: see text], a quantity which is determined by beta-decay-rates. In this paper, we focus on the calculation of electroweak decay-rates in presence of massive neutrinos. The resulting expressions are then used to calculate nuclear reactions entering the rapid-neutron capture. We fix the astrophysical parameters to the case of a core-collapse supernova. The neutrino sector includes a mass scheme and mixing

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4

Bhatti, A. Aziz, and Harald Fritzsch. "Zero texture lepton mass matrices and near tribimaximal mixing in the SO(10) theory." Modern Physics Letters A 29, no. 12 (2014): 1450059. http://dx.doi.org/10.1142/s021773231450059x.

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We have described the quark and lepton masses and mixings in context of non-SUSY SO(10) and "four-zero-texture" (FZT). In the FZT case, the fermion masses and the mixing angles can be related. We predict the neutrino masses using the near tribimaximal (TBM) mixing and the triminimal mixing. Our results show that under TBM, the neutrinos have a normal, but weak hierarchy. Variations of the neutrino masses under the "Near TBM-scenario" are also discussed.

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5

FRITZSCH, HARALD. "FLAVOR SYMMETRIES, NEUTRINO MASSES AND NEUTRINO MIXING." International Journal of Modern Physics A 23, no. 21 (2008): 3179–82. http://dx.doi.org/10.1142/s0217751x08041773.

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We discuss the neutrino mixing, using the texture 0 mass matrices, which work very well for the quarks. The solar mixing angle is directly linked to the mass ratio of the first two neutrinos. The neutrino masses are hierarchical, but the mass ratios turn out to be much smaller than for quarks. The atmospheric mixing angle is 38°. The CP violation for leptons should be much smaller than for quarks.

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6

Nicolaidis, Argyris. "Neutrinos and the structure of space-time." Facta universitatis - series: Physics, Chemistry and Technology 12, no. 2 (2014): 179–88. http://dx.doi.org/10.2298/fupct1402179n.

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The phenomenon of neutrino oscillations is studied usually as a mixing between the flavor neutrinos and the neutrinos having a definite mass. The mixing angles and the mass eigenvalues are treated independently in order to accommodate the experimental data. We suggest that neutrino oscillations are connected to the structure of spacetime. We expand on a recently proposed model, where two ?mirror? branes coexist. One brane hosts left-handed particles (our brane), while the other brane hosts right-handed particles. Majorana-type couplings mixes neutrinos in an individual brane, while Dirac-type

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7

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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8

Vien, V. V. "Lepton mass and mixing in a neutrino mass model based onS4flavor symmetry." International Journal of Modern Physics A 31, no. 09 (2016): 1650039. http://dx.doi.org/10.1142/s0217751x16500391.

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We study a neutrino mass model based on [Formula: see text] flavor symmetry which accommodates lepton mass, mixing with nonzero [Formula: see text] and CP violation phase. The spontaneous symmetry breaking in the model is imposed to obtain the realistic neutrino mass and mixing pattern at the tree-level with renormalizable interactions. Indeed, the neutrinos get small masses from one [Formula: see text] doublet and two [Formula: see text] singlets in which one being in [Formula: see text] and the two others in [Formula: see text] under [Formula: see text] with both the breakings [Formula: see

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9

Verma, Surender. "Theoretical and Phenomenological Status of Neutrino Physics: A Brief Review." Advances in High Energy Physics 2015 (2015): 1–15. http://dx.doi.org/10.1155/2015/385968.

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We present an overview of recent progress in the theoretical and phenomenological studies of neutrino masses, lepton avor mixing, and CP violation. Firstly, We discuss the status of neutrino mass with in the Standard Model (SM) of particle physics. Then the possible ways in which neutrino mass terms can be included in the SM are discussed. The inclusion of new physics beyond the SM inevitably brings new parameters which are not constrained by the present experimental data on neutrino masses and mixing angles and, thus, are free parameters of the theory. We, also, discuss various theoretically

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10

FRITZSCH, H. "FLAVOR MIXING, QUARK MASSES, NEUTRINO MASSES AND NEUTRINO OSCILLATIONS." International Journal of Modern Physics A 24, no. 18n19 (2009): 3354–58. http://dx.doi.org/10.1142/s0217751x09046941.

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We study a model for the mass matrices of the quarks and leptons. Two of the three flavor mixing angles of the quarks can be calculated in terms of the quark mass ratios. They agree very well with the experiments. We are able to relate the mass eigen values of the charged leptons and of the neutrinos to the mixing angles and can predict the masses of the neutrinos. We find a normal hierarchy -the masses are 0.004 eV, 0.01 eV and 0.05 eV. The atmospheric mixing angle is given by the mass ratios of the charged leptons and the neutrinos. We find 38 degrees, consistent with the experiments. The mi

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11

FRITZSCH, H. "FLAVOR MIXING, QUARK MASSES, NEUTRINO MASSES AND NEUTRINO OSCILLATIONS." International Journal of Modern Physics A 25, no. 02n03 (2010): 597–601. http://dx.doi.org/10.1142/s0217751x10048883.

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We discuss first the flavor mixing of the quarks, using the texture zero mass matrices. Then we study a similar model for the mass matrices of the leptons. We are able to relate the mass eigenvalues of the charged leptons and of the neutrinos to the mixing angles and can predict the masses of the neutrinos. We find a normal hierarchy - the masses are 0.004 eV, 0.01 eV and 0.05 eV. The atmospheric mixing angle is given by the mass ratios of the charged leptons and the neutrinos. We find about 40°, consistent with the experiments. The mixing element, connecting the first neutrino with the electr

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12

Alberico, W. M., and S. M. Bilenky. "New developments in neutrino physics." HNPS Proceedings 9 (February 11, 2020): 40. http://dx.doi.org/10.12681/hnps.2775.

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A review of the problems of neutrino mass, mixing and oscillations is given. Possible phenomenological schemes of neutrino mixing are discussed. The most important consequences of neutrino mixing-neutrino oscillations are considered in some detail. The data of atmospheric, solar and LSND experiments are discussed. The results of phenomenological analysis of the data under the assumption of the mixing of three and four massive neutrinos are briefly presented.

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13

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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14

CHAO, WEI, SHU LUO, ZHI-ZHONG XING, and SHUN ZHOU. "TeV-SCALE TYPE-II SEESAW MODELS AND POSSIBLE COLLIDER SIGNATURES." International Journal of Modern Physics A 23, no. 21 (2008): 3420–24. http://dx.doi.org/10.1142/s0217751x08042249.

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A natural extension of the standard model to accommodate massive neutrinos is to introduce one Higgs triplet and three right-handed Majorana neutrinos, leading to a 6×6 neutrino mass matrix. We show that three light Majorana neutrinos (i.e., the mass eigenstates of νe, νμ and ντ) are exactly massless, if and only if [Formula: see text] exactly holds in this seesaw model. We propose three simple Type-II seesaw scenarios with broken A4 × U(1)x flavor symmetry to interpret the observed neutrino mass spectrum and neutrino mixing pattern. Such a TeV-scale neutrino model can be tested in two complem

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15

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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16

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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17

Krasnov, Igor. "Numerical estimate of minimal active-sterile neutrino mixing." EPJ Web of Conferences 191 (2018): 03003. http://dx.doi.org/10.1051/epjconf/201819103003.

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Seesaw mechanism constrains from below mixing between active and sterile neutrinos for fixed sterile neutrino masses. Signal events associated with sterile neutrino decays inside a detector at fixed target experiment are suppressed by the mixing angle to the power of four. Therefore sensitivity of experiments such as SHiP and DUNE should take into account minimal possible values of the mixing angles. We extend the previous study of this subject [1] to a more general case of non-zero CP-violating phases in the neutrino sector. Namely, we provide numerical estimate of minimal value of mixing ang

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18

DE GOUVÊA, ANDRÉ. "NEUTRINOS HAVE MASS — SO WHAT?" Modern Physics Letters A 19, no. 38 (2004): 2799–813. http://dx.doi.org/10.1142/s0217732304016032.

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In this brief review, we discuss the new physics unveiled by neutrino oscillation experiments over the past several years, and discuss several attempts at understanding the mechanism behind neutrino masses and lepton mixing. It is fair to say that, while significant theoretical progress has been made, we are yet to construct a coherent picture that naturally explains nonzero, yet tiny, neutrino masses and the newly revealed, puzzling patterns of lepton mixing. We discuss what the challenges are, and point to the fact that more experimental input (from both neutrino and "non-neutrino" experimen

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19

SCHWIENHORST, REINHARD. "COLLIDING NEUTRINO BEAMS." Modern Physics Letters A 23, no. 32 (2008): 2751–61. http://dx.doi.org/10.1142/s0217732308028193.

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From several neutrino oscillation experiments, we understand now that neutrinos have mass. However, we really do not know what mechanism is responsible for producing this neutrino mass. Current or planned neutrino experiments utilize neutrino beams and long-baseline detectors to explore flavor mixing but do not address the question of the origin of neutrino mass. In order to begin answering that question, neutrino interactions need to be explored at much higher energies. This paper outlines a program to explore neutrinos and their interactions with various particles through a series of experim

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20

TAKAHASHI, RYO, and MORIMITSU TANIMOTO. "DARK ENERGY AND NEUTRINO MODEL IN SUSY." International Journal of Modern Physics E 16, no. 05 (2007): 1529–39. http://dx.doi.org/10.1142/s0218301307006861.

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We consider a Mass Varying Neutrinos (MaVaNs) model in supersymmetric theory. The model includes effects of supersymmetry breaking transmitted by the gravitational interaction from the hidden sector, in which supersymmetry was broken, to the dark energy sector. Then evolutions of the neutrino mass and the equation of state parameter of the dark energy are presented in the model. It is remarked that only the mass of a sterile neutrino is variable in the case of the vanishing mixing between the left-handed and a sterile neutrino on cosmological time scale. The finite mixing makes the mass of the

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21

Nguyen Thi Kim, Ha, Van Nguyen Thi Hong, and Son Cao Van. "Unitarity of neutrino mixing matrix." EPJ Web of Conferences 206 (2019): 09009. http://dx.doi.org/10.1051/epjconf/201920609009.

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Neutrinos are neutral leptons and there exist three types of neutrinos (electron neutrinos νe, muon neutrinos νµ and tau neutrinos ντ). These classifications are referred to as neutrinos’s “flavors”. Oscillations between the different flavors are known as neutrino oscillations, which occurs when neutrinos have mass and non-zero mixing. Neutrino mixing is governed by the PMNS mixing matrix. The PMNS mixing matrix is constructed as the product of three independent rotations. With that, we can describe the numerical parameters of the matrix in a graphical form called the unitary triangle, giving

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22

Fritzsch, Harald. "Neutrino masses and flavor mixing." Modern Physics Letters A 30, no. 16 (2015): 1530012. http://dx.doi.org/10.1142/s0217732315300128.

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We discuss the neutrino oscillations, using texture zero mass matrices for the leptons. The reactor mixing angle θl is calculated. The ratio of the masses of two neutrinos is determined by the solar mixing angle. We can calculate the masses of the three neutrinos: m1 ≈ 0.003 eV , m2 ≈ 0.012 eV , m3 ≈ 0.048 eV .

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23

MA, BO-QIANG. "NEUTRINO OSCILLATIONS: FROM STANDARD AND NON-STANDARD VIEWPOINTS." International Journal of Modern Physics: Conference Series 01 (January 2011): 291–96. http://dx.doi.org/10.1142/s2010194511000420.

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In the standard model of neutrino oscillations, the neutrino flavor states are mixtures of mass-eigenstates, and the phenomena are well described by the neutrino mixing matrix, i.e., the PMNS matrix. I review the recent progress on parametrization of the neutrino mixing matrix. Besides that I also discuss on the possibility to describe the neutrino oscillations by a non-standard model in which the neutrino mixing is caused by the Lorentz violation (LV) contribution in the effective field theory for LV. We assume that neutrinos are massless and that neutrino flavor states are mixing states of e

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24

Petcov, S. T. "Leptonic CP violation and leptogenesis." International Journal of Modern Physics A 29, no. 11n12 (2014): 1430028. http://dx.doi.org/10.1142/s0217751x14300282.

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The phenomenology of 3-neutrino mixing, the current status of our knowledge about the 3-neutrino mixing parameters, including the absolute neutrino mass scale, and of the Dirac and Majorana CP violation in the lepton sector, are reviewed. The problems of CP violation in neutrino oscillations and of determining the nature — Dirac or Majorana — of massive neutrinos, are discussed. The seesaw mechanism of neutrino mass generation and the related leptogenesis scenario of generation of the baryon asymmetry of the universe, are considered. The results showing that the CP violation necessary for the

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25

Matute, Ernesto A. "Low-scale minimal linear seesaw model for neutrino mass and flavor mixing." Modern Physics Letters A 36, no. 22 (2021): 2150159. http://dx.doi.org/10.1142/s0217732321501595.

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We consider an extension of the Standard Model with three right-handed (RH) neutrinos and a Dirac pair of extra sterile neutrinos, odd under a discrete [Formula: see text] symmetry, in order to have left–right symmetry in the neutrino content and obtain tiny neutrino masses from the latter ones only. Our working hypothesis is that the heavy RH neutrinos do not influence phenomenology at low energies. We use the usual high-scale seesaw to suppress all of the mass terms involving RH neutrinos and a low-scale minimal variant of the linear seesaw led by the Dirac mass of the extra sterile neutrino

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26

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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27

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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28

PAKVASA, SANDIP. "NEUTRINO PROPERTIES FROM HIGH ENERGY ASTROPHYSICAL NEUTRINOS." Modern Physics Letters A 19, no. 13n16 (2004): 1163–69. http://dx.doi.org/10.1142/s0217732304014513.

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It is shown how high energy neutrino beams from very distant sources can be utilized to yield information about properties of neutrinos such as lifetimes and the possible mass hierarchy.Furthermore, mixing elements such as Ue3 and the CPV phase in the neutrino mixing matrix can be determined in principle. Pseudo-Dirac mass differences as small as 10-18eV2 can be probed as well.

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29

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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30

Borah, Debasish. "Relating lepton mixing angles with lepton mass hierarchy." International Journal of Modern Physics A 31, no. 04n05 (2016): 1650002. http://dx.doi.org/10.1142/s0217751x16500020.

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We revisit the possibility of relating lepton mixing angles with lepton mass hierarchies in a model-independent way. Guided by the existence of such relations in the quark sector, we first consider all the mixing angles, both in charged lepton and neutrino sectors to be related to the respective mass ratios. This allows us to calculate the leptonic mixing angles observed in neutrino oscillations as functions of the lightest neutrino mass. We show that for both normal and inverted hierarchical neutrino masses, this scenario does not give rise to correct leptonic mixing angles. We then show that

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31

DAMANIK, ASAN. "NONZERO θ13 AND NEUTRINO MASSES FROM MODIFIED NEUTRINO MIXING MATRIX". International Journal of Modern Physics A 27, № 17 (2012): 1250091. http://dx.doi.org/10.1142/s0217751x12500911.

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The nonzero and relatively large θ13 have been reported by Daya Bay, T2K, MINOS and Double Chooz Collaborations. In order to accommodate the nonzero θ13, we modified the tribimaximal (TB), bimaxima (BM) and democratic (DC) neutrino mixing matrices. From three modified neutrino mixing matrices, two of them (the modified BM and DC mixing matrices) can give nonzero θ13 which is compatible with the result of the Daya Bay and T2K experiments. The modified TB neutrino mixing matrix predicts the value of θ13 which is greater than the upper bound value of the latest experimental results. By using the

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32

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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33

Nath, Newton, Monojit Ghosh, and Shivani Gupta. "Understanding the masses and mixings of one-zero textures in 3+1 scenario." International Journal of Modern Physics A 31, no. 24 (2016): 1650132. http://dx.doi.org/10.1142/s0217751x16501323.

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We present a detailed analysis and phenomenological consequences of neutrino mass matrix, [Formula: see text], with one-zero texture in the flavor basis where the active neutrino sector is extended by one sterile neutrino (3[Formula: see text]+[Formula: see text]1 case). In particular, our aim is to explore behavior of the sterile mixing parameters in detail when one of the elements of the neutrino mass matrix goes to zero. To study this, we consider two distinct mass spectrum of the active neutrinos: (i) completely hierarchical mass spectrum with a vanishing neutrino mass and (ii) completely

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34

Zhou, Shun. "Supernova bounds on keV-mass sterile neutrinos." International Journal of Modern Physics A 30, no. 13 (2015): 1530033. http://dx.doi.org/10.1142/s0217751x15300331.

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Sterile neutrinos of keV masses are one of the most promising candidates for the warm dark matter, which could solve the small-scale problems encountered in the scenario of cold dark matter. We present a detailed study of the production of such sterile neutrinos in a supernova core, and derive stringent bounds on the active-sterile neutrino mixing angles and sterile neutrino masses based on the standard energy-loss argument.

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35

Pramanick, Soumita, and Amitava Raychaudhuri. "Relating small neutrino masses and mixing." International Journal of Modern Physics A 30, no. 14 (2015): 1530036. http://dx.doi.org/10.1142/s0217751x15300367.

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Experiments on neutrino oscillations have uncovered several small parameters, θ13 being a prominent one. Others are the solar mass splitting vis-à-vis the atmospheric one and the deviation of θ23 from maximal mixing. In this talk, (talk given at the International Conference on Massive Neutrinos, Singapore, 9–13 February 2015) we elaborate on a neutrino mass model based on the see-saw mechanism in which the mixing angles to start with are either vanishing (θ13 and θ12) or π/4 (θ23). The atmospheric mass splitting is taken as a part of this initial structure but the solar splitting is absent. A

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Ahuja, Gulsheen, and Manmohan Gupta. "Texture zero mass matrices and nature of neutrinos." International Journal of Modern Physics A 33, no. 31 (2018): 1844032. http://dx.doi.org/10.1142/s0217751x18440323.

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For Majorana as well as Dirac neutrinos, attempt has been made to carry out a comparative study of the predictions of Fritzsch-like texture 6, 5 and 4 zero leptonic mass matrices. In particular, considering normal hierarchy of neutrino masses, we have examined how the parameter space available to the mixing angles with respect to the lightest neutrino mass changes for the two types of neutrinos.

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37

XING, ZHI-ZHONG, HE ZHANG та SHUN ZHOU. "GENERALIZED FRIEDBERG-LEE MODEL FOR NEUTRINO MASSES AND LEPTONIC CP VIOLATION FROM μ-τ SYMMETRY BREAKING". International Journal of Modern Physics A 23, № 21 (2008): 3384–87. http://dx.doi.org/10.1142/s0217751x0804216x.

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Assuming the Majorana nature of massive neutrinos, we generalize the Friedberg-Lee neutrino mass model to include CP violation in the neutrino mass matrix Mν. The most general case with all the free parameters of Mν being complex is discussed. We show that a favorable neutrino mixing pattern (with θ12 ≈ 35.3°, θ23 = 45°, θ13 ≠ 0° and δ = 90°) can naturally be derived from Mν, if it has an approximate or softly-broken μ-τ symmetry. We also point out a different way to obtain the nearly tri-bimaximal neutrino mixing pattern with δ = 0° and non-vanishing Majorana phases.

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Sakashita, Ken. "Neutrino Physics." Journal of Physics: Conference Series 2446, no. 1 (2023): 012026. http://dx.doi.org/10.1088/1742-6596/2446/1/012026.

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Abstract The observation of neutrino oscillations is firm evidence of non-zero neutrino mass. Neutrino mass and mixing have been studied by neutrino oscillation experiments so far. One of the remaining questions is whether neutrinos violate CP symmetry. Exploring new CP violation is also a subject of kaon physics. There are other common physics topics between neutrino and kaon experiments. In this talk, recent progress and future prospects of neutrino experiments for topics related to kaon physics will be discussed.

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VIEN, V. V., and H. N. LONG. "THE D4FLAVOR SYMMETRY IN 3-3-1 MODEL WITH NEUTRAL LEPTONS." International Journal of Modern Physics A 28, no. 32 (2013): 1350159. http://dx.doi.org/10.1142/s0217751x13501595.

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We construct a D4flavor model based on SU(3)C⊗SU(3)L⊗U(1)Xgauge symmetry responsible for fermion masses and mixings. The neutrinos get small masses from antisextets which are in a singlet and a doublet under D4. If the D4symmetry is violated as perturbation by a Higgs triplet under SU(3)Land lying in [Formula: see text] of D4, the corresponding neutrino mass mixing matrix gets the most general form. In this case, the model can fit the experimental data in 2012 on neutrino masses and mixing. Our results show that the neutrino masses are naturally small and a little deviation from the tribimaxim

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Goswami, Srubabati, Amitava Raychaudhuri, and Kamales Kar. "Accelerator, Reactor and Atmospheric Neutrino Data: A Three-Flavor Oscillation Analysis." International Journal of Modern Physics A 12, no. 04 (1997): 781–99. http://dx.doi.org/10.1142/s0217751x97000621.

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We perform a three-flavor oscillation analysis of accelerator, reactor and atmospheric neutrino results. Motivated by the experimental data, the mass squared differences are chosen to be Δ12 = Δ13 in the range 0.5–10 eV2 and Δ23 = 10-2 eV2. In such a scenario, the oscillation probabilities for the accelerator and reactor neutrinos involve only two of the mixing angles and one mass scale. But the atmospheric neutrino oscillation is governed by both mass scales and all the three mixing angles. The greater latitude allowed by the scheme leads to some new and interesting solution regions for atmos

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Civitarese, Osvaldo, Mercedes Elisa Mosquera, and María Manuela Sáez. "Effects of active–sterile neutrino mixing during primordial nucleosynthesis." International Journal of Modern Physics E 23, no. 12 (2014): 1450080. http://dx.doi.org/10.1142/s0218301314500803.

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In the present work, we discuss the effects of the inclusion of sterile–active neutrino oscillations during the production of primordial light-nuclei. We assume that the sterile neutrino mass-eigenstate might oscillate with the two lightest active neutrino mass-eigenstates, with mixing angles ϕ1 and ϕ2. We also allow a constant renormalization (represented by a parameter (ζ)) of the sterile neutrino occupation factor. Taking ζ and the mixing angles as free parameters, we have computed distribution functions of active and sterile neutrinos and primordial abundances. Using observable data we set

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Jones, B. J. P. "IceCube Sterile Neutrino Searches." EPJ Web of Conferences 207 (2019): 04005. http://dx.doi.org/10.1051/epjconf/201920704005.

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Anomalies in short baseline experiments have been interpreted as evidence for additional neutrino mass states with large mass splittings from the known, active flavors. This explanation mandates a corresponding signature in the muon neutrino disappearance channel, which has yet to be observed. Searches for muon neutrino disappearance at the IceCube neutrino telescope presently provide the strongest limits in the space of mixing angles for eVscale sterile neutrinos. This proceeding for the Very Large Volume Neutrino Telescopes (VLVnT) Workshop summarizes the IceCube analyses that have searched

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Fanchi, John R. "Neutrino Flavor Transitions as Mass State Transitions." Symmetry 11, no. 8 (2019): 948. http://dx.doi.org/10.3390/sym11080948.

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Experiments have shown that transitions occur between electron neutrino, muon neutrino, and tau neutrino flavors. Some experiments indicate the possible existence of a fourth neutrino known as the sterile neutrino. The question arises: do all neutrino flavors participate in transitions between flavors? These transitions are viewed as mass state transitions in parametrized relativistic dynamics (PRD). PRD frameworks have been developed for neutrino flavor transitions associated with the mixing of two mass states or the mixing of three mass states. This paper presents an extension of the framewo

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TANIMOTO, MORIMITSU. "NEUTRINO MASSES AND MIXINGS IN FLIPPED SU(5)." Modern Physics Letters A 09, no. 20 (1994): 1827–34. http://dx.doi.org/10.1142/s0217732394001684.

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We study the neutrino masses and mixings in the flipped SU(5) model assuming the Dimopoulos-Hall-Raby type mass matrices. The neutrino masses are evolved down to low energies by using the renormalization group equation of the effective seesaw mass operator. The ντ mass and the νµ−ντ mixing are predicted by using the solar neutrino data. The predicted mass is consistent with the condition of the hot dark matter expected from COBE results. Our results are also compared with the ones in SO(10). Although the large νµ−ντ mixing could be obtained in our model, the ντ mass is too small to be consiste

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LEONTARIS, G. K., A. PSALLIDAS, and N. D. VLACHOS. "INVERTED NEUTRINO MASS HIERARCHIES FROM U(1) SYMMETRIES." International Journal of Modern Physics A 21, no. 26 (2006): 5187–204. http://dx.doi.org/10.1142/s0217751x06033921.

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Motivated by effective low energy models of string origin, we discuss the neutrino masses and mixing within the context of the Minimal Supersymmetric Standard Model supplemented by a U(1) anomalous family symmetry and additional Higgs singlet fields charged under this extra U(1). In particular, we interpret the solar and atmospheric neutrino data assuming that there are only three left-handed neutrinos which acquire Majorana masses via a lepton number violating dimension-five operator. We derive the general form of the charged lepton and neutrino mass matrices when two different pairs of singl

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FOOT, R. "NEUTRINO OSCILLATIONS AND THE EXACT PARITY MODEL." Modern Physics Letters A 09, no. 02 (1994): 169–79. http://dx.doi.org/10.1142/s0217732394000186.

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We re-examine neutrino oscillations in exact parity models. Previously it was shown in a specific model that large neutrino mixing angles result. We show here that this is a general result of neutrino mixing in exact parity models provided that the neutrino mass matrix is real. In this case, the effects of neutrino mixing in exact parity models is such that the probability of a given weak eigenstate remaining in that eigenstate averages to less than half when averaged over many oscillations. This result is interesting in view of the accumulating evidence for a significant deficit in the number

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Fritzsch, Harald. "Oscillating Neutrinos and Majorana Neutrino Masses." Universe 6, no. 2 (2020): 29. http://dx.doi.org/10.3390/universe6020029.

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We discuss the mass matrices with texture zeros for the quarks and leptons. The flavor mixing angles for the quarks are functions of the quark masses and can be calculated. The results agree with the experimental data. The texture zero mass matrices for the leptons and the see-saw mechanism are used to derive relations between the matrix elements of the lepton mixing matrix and the ratios of the neutrino masses. Using the measured neutrino mass differences, the neutrino masses can be calculated. The neutrinoless double beta decay is discussed. The effective Majorana neutrino mass, describing t

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Upadhyay, A., and M. Batra. "Phenomenology of Neutrino Mixing in Vacuum and Matter." ISRN High Energy Physics 2013 (February 13, 2013): 1–15. http://dx.doi.org/10.1155/2013/206516.

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The current status and some perspectives of the phenomenology of massive neutrinos is reviewed. We start with the phenomenology of neutrino oscillations in vacuum and in matter. We summarize the results of neutrino experiments using solar, atmospheric. The fundamental theory of flavor changing neutrinos that has confirmed the neutrino oscillations and the various parameters affecting these oscillations have been discussed in detail. Specifically we will take the solar and atmospheric neutrino case. The oscillation plots will be discussed in detail, based on their behavior in vacuum and matter.

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Dev, S., and Desh Raj. "Phenomenology of Trimaximal Mixing with One Texture Equality." Advances in High Energy Physics 2022 (September 30, 2022): 1–17. http://dx.doi.org/10.1155/2022/4952562.

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We study neutrino mass matrices with one texture equality and the neutrino mixing matrix having either its first ( T M 1 ) or second ( T M 2 ) column identical to that of the tribimaximal mixing matrix. We found that out of total fifteen possible neutrino mass matrices with one texture equality, only six textures are compatible with T M 1 mixing and six textures are compatible with T M 2 mixing in the light of the current neutrino oscillation data. These textures have interesting implications for the presently unknown parameters such as the neutrino mass scale, effective Majorana neutrino mass

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Granelli, Alessandro. "Standard and Non-Standard Aspects of Neutrino Physics." Universe 10, no. 4 (2024): 164. http://dx.doi.org/10.3390/universe10040164.

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This review provides a succinct overview of the basic aspects of neutrino physics. The topics covered include neutrinos in the standard model and the three-neutrino mixing scheme; the current status of neutrino oscillation measurements and what remains to be determined; the seesaw mechanisms for neutrino mass generation and the associated phenomenology, including the leptogenesis mechanism to explain the observed matter–antimatter asymmetry of the Universe; and models for the origin of the pattern of neutrino mixing and lepton masses based on discrete flavour symmetries and modular invariance.

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