scholarly journals ANALYSIS OF NEUTRINO OSCILLATION IN THREE-FLAVOR NEUTRINOS

1999 ◽  
Vol 14 (12) ◽  
pp. 1953-1974 ◽  
Author(s):  
T. SAKAI ◽  
O. INAGAKI ◽  
T. TESHIMA
Keyword(s):  
Neutrino Oscillation ◽  
Zenith Angle ◽  
Small Angle ◽  
Solar Neutrino ◽  
Atmospheric Neutrino ◽  
Large Angle ◽  
Angle Dependence ◽  
Significant Difference ◽  
Neutrino Experiments

We analyze the solar, terrestrial and atmospheric neutrino experiments including SuperKamiokande data using the three-flavor neutrinos framework and obtain the allowed region for parameters [Formula: see text]. In solar neutrino experiments, we obtain the large angle solution [Formula: see text] and small angle solution (3×10-6-1.2×10-5 eV 2, 0.003-0.01) for θ13=0°-20°. From the terrestrial and atmospheric neutrino experiments including the sub-GeV and multi-GeV zenith angle dependence in SuperKamiokande 535 days data, we found that the νμ-ντ mixing is large and the range of [Formula: see text] as 0.02~0.0002  eV 2. There is no significant difference between large θ12 angle solution and small one.

scholarly journals ON RECONCILING ATMOSPHERIC, LSND, AND SOLAR NEUTRINO-OSCILLATION DATA

1998 ◽  
Vol 13 (28) ◽  
pp. 2249-2264 ◽  
Author(s):  
D. V. AHLUWALIA
Keyword(s):  
Neutrino Oscillation ◽  
Solar Neutrino ◽  
Sterile Neutrino ◽  
Atmospheric Neutrino ◽  
Neutrino Flux ◽  
Cpt Symmetry ◽  
Charge Conjugate ◽  
Mixing Matrix ◽  
Quantum Operators ◽  
Neutrino Experiments

The L/E-flatness of the e-like events observed in the recent atmospheric-neutrino data from super-Kamiokande (SuperK) is interpreted to reflect a new symmetry of the neutrino-oscillation mixing matrix. From that we obtain an analytical set of constraints yielding a class of mixing matrices of the property to simultaneously fit both the SuperK and the LSND data. The resulting mass squared difference relevant for the LSND experiment is found as 0.3 eV2. The discussed symmetry, e.g., carries the nature that expectation values of masses for νμ and ντ are identical. These considerations are purely data dictated. A different framework is then applied to the solar neutrino problem. It is argued that a single sterile neutrino is an unlikely candidate to accommodate the data from the four solar neutrino experiments. A scenario is discussed which violates CPT symmetry, and favors the [Formula: see text] system to belong to the "self"–"anti-self" charge conjugate construct in the (1/2, 0)⊕(0,1/2) representation space, where the needed helicity flipping amplitudes are preferred, rather than the usual Dirac, or Majorana, constructs. In the presented framework the emerging SuperK data on solar neutrino flux is reconciled with the Homestake, GALLEX, and SAGE experiments. This happens because the former detects not only the solar νe but also, at a lower cross-section, the oscillated solar [Formula: see text]; while the latter are sensitive only to the oscillation-diminished solar νe flux. A direct observation of solar [Formula: see text] by SNO will confirm our scenario. Finally, we consider the possibility for flavor-dependent gravitational couplings of neutrinos as emerging out of the noncommutativity of the quantum operators associated with the measurements of energy and flavor.

Future prospects in neutrino physics

2021 ◽  
pp. 2130007
Author(s):  
Sandhya Choubey
Keyword(s):  
Neutrino Physics ◽  
Neutrino Oscillation ◽  
Atmospheric Neutrino ◽  
New Physics ◽  
Future Prospects ◽  
The Past ◽  
Long Baseline ◽  
Neutrino Experiments

Neutrino physics has come a long way and made great strides in the past decades. We discuss the prospects of what more can be learned in this field in the forthcoming neutrino oscillation facilities. We will mostly focus on the potential of the long-baseline experiments and the atmospheric neutrino experiments. Sensitivity of these experiments to standard neutrino oscillation parameters will be presented. We will also discuss the prospects of new physics searches at these facilities.

scholarly journals Combined Effect of NSI and SFP on Solar Electron Neutrino Oscillation

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Deniz Yilmaz
Keyword(s):  
Neutrino Oscillation ◽  
Solar Neutrino ◽  
Survival Probability ◽  
Low Energy ◽  
Electron Neutrino ◽  
Combined Effect ◽  
Neutrino Interaction ◽  
Dirac Particles ◽  
Electron Neutrinos ◽  
Neutrino Experiments

The combined effect of spin-flavor precession (SFP) and the nonstandard neutrino interaction (NSI) on the survival probability of solar electron neutrinos (assumed to be Dirac particles) is examined for various values ofϵ11,ϵ12, andμB. It is found that the neutrino survival probability curves affected by SFP and NSI effects individually for some values of the parameters (ϵ11,ϵ12, andμB) get close to the standard MSW curve when both effects are combined. Therefore, the combined effect of SFP and NSI needs to be taken into account when the solar electron neutrino data obtained by low energy solar neutrino experiments is investigated.

STATUS AND PERSPECTIVES OF DOUBLE BETA DECAY — WINDOW TO NEW PHYSICS BEYOND THE STANDARD MODEL OF PARTICLE PHYSICS

1998 ◽  
Vol 13 (23) ◽  
pp. 3953-3992 ◽  
Author(s):  
H. V. KLAPDOR-KLEINGROTHAUS
Keyword(s):  
Standard Model ◽  
Beta Decay ◽  
Neutrino Oscillation ◽  
Atmospheric Neutrino ◽  
Large Angle ◽  
High Energy ◽  
New Physics ◽  
Double Beta Decay ◽  
Boson Mass ◽  
Electron Mass

Nuclear double beta decay provides an extraordinarily broad potential to search for beyond Standard Model physics, probing already now the TeV scale, on which new physics should manifest itself. These possibilities are reviewed here. First, the results of present generation experiments are presented. The most sensitive one of them — the Heidelberg–Moscow experiment in the Gran Sasso — probes the electron mass now in the sub eV region and will reach a limit of ~ 0.1 eV in a few years. Basing to a large extent on the theoretical work of the Heidelberg Double Beta Group in the last two years, results are obtained also for SUSY models (R-parity breaking, sneutrino mass), leptoquarks (leptoquark–Higgs coupling), compositeness, right-handed W boson mass and others. These results are comfortably competitive to corresponding results from high-energy accelerators like TEVATRON, HERA, etc. Second, future perspectives of ββ research are discussed. A new Heidelberg experimental proposal (GENIUS) is presented which would allow one to increase the sensitivity for Majorana neutrino masses from the present level of at best 0.1 eV down to 0.01 or even 0.001 eV. Its physical potential would be a breakthrough into the multi-TeV range for many beyond standard models. Its sensitivity for neutrino oscillation parameters would be higher than that for all present terrestrial neutrino oscillation experiments and of those planned for the future. It could probe directly the atmospheric neutrino problem and even the large angle solution of the solar neutrino problem. It would further, already in a first step, using only 100 kg of natural Ge detectors, cover almost the full MSSM parameter space for prediction of neutralinos as cold dark matter, making the experiment competitive to LHC in the search for supersymmetry.

RECENT SOLAR NEUTRINO OBSERVATIONS AND RESONANT NEUTRINO MIXING

1991 ◽  
Vol 06 (01) ◽  
pp. 15-20 ◽  
Author(s):  
T. K. KUO ◽  
JAMES PANTALEONE
Keyword(s):  
Solar Neutrino ◽  
Neutrino Oscillations ◽  
Large Angle ◽  
Solar Model ◽  
Neutrino Mixing ◽  
Standard Solar Model ◽  
Solar Neutrino Problem ◽  
Neutrino Experiments ◽  
Good Agreement

The results of recent data from the 37 Cl , Kamiokande-II (K-II) and 71 Ga solar neutrino experiments are quantitatively analyzed. The results suggest that non-standard neutrino properties, instead of a non-standard solar model, are the correct explanation for the "solar neutrino problem." Assuming resonant neutrino oscillations, it is found that the "non-adiabatic" and "large angle" solutions are in quite good agreement with the data. The implications of these solutions for forthcoming solar neutrino experiments are discussed.

scholarly journals FINALLY NEUTRINO HAS MASS

2000 ◽  
Vol 15 (05) ◽  
pp. 625-650 ◽  
Author(s):  
S. M. BILENKY ◽  
C. GIUNTI ◽  
C. W. KIM
Keyword(s):  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Solar Neutrino ◽  
Present Status ◽  
Neutrino Oscillations ◽  
Neutrino Masses ◽  
Atmospheric Neutrinos ◽  
Neutrino Experiments

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.

scholarly journals Small 𝜃13 and solar neutrino oscillation parameters from μ − τ symmetry

2021 ◽  
Author(s):  
Abdel Pérez-Lorenzana
Keyword(s):  
Neutrino Oscillation ◽  
Solar Neutrino ◽  
Mass Matrix ◽  
Atmospheric Neutrino ◽  
Majorana Neutrino ◽  
Neutrino Mixing ◽  
Mass Eigenstates ◽  
Reactor Neutrino ◽  
Exact Symmetry ◽  
Majorana Neutrino Mass

Exchange [Formula: see text] symmetry in the effective Majorana neutrino mass matrix does predict a maximal mixing for atmospheric neutrino oscillations asides to a null mixing that cannot be straightforwardly identified with reactor neutrino oscillation mixing, [Formula: see text], unless a specific ordering is assumed for the mass eigenstates. Otherwise, a nonzero value for [Formula: see text] is predicted already at the level of an exact symmetry. In this case, solar neutrino mixing and scale, as well as the correct atmospheric mixing arise from the breaking of the symmetry. I present a mass matrix proposal for normal hierarchy that realizes this scenario, where the smallness of [Formula: see text] is naturally given by the parameter [Formula: see text] and the solar mixing is linked to the smallness of [Formula: see text]. The proposed matrix remains stable under renormalization effects and it also allows to account for CP violation within the expected region without further constrains.

BOUNDS ON LEPTON FLAVOR CHANGING CURRENTS AND THE SOLAR NEUTRINO PUZZLE: Bounds on Lepton Flavor Changing Currents

1993 ◽  
Vol 08 (06) ◽  
pp. 471-481 ◽  
Author(s):  
SCILLA DEGL’INNOCENTI ◽  
BARBARA RICCI
Keyword(s):  
Solar Neutrino ◽  
Atmospheric Neutrino ◽  
Coupling Constant ◽  
Vector Coupling ◽  
Neutrino Detectors ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Long Baseline ◽  
Neutrino Experiments ◽  
Charged Lepton Sector

We present a phenomenological analysis of a lepton flavor changing current, considering the case of interactions among leptons which change the neutrino flavor and are diagonal in the charged lepton sector. In the case of νe↔νµ transition, we derive a bound on the vector coupling constant GV≤0.16 GF from experimental data on νµ−e scattering. For a transition νe↔νx, from (anti) νe−e scattering experiments and from the analysis of advanced stellar evolutionary phases, we find GV≤0.55 GF. We discuss the compatibility of these data with a possible explanation of the solar neutrino puzzle. We also analyze how the present bounds can be improved in future long baseline neutrino experiments and atmospheric neutrino detectors.

Solar neutrino experiments and determination of the neutrino oscillation parameters

1994 ◽  
Vol 49 (12) ◽  
pp. 6298-6318 ◽  
Author(s):  
Gianni Fiorentini ◽  
Marcello Lissia ◽  
Giuseppe Mezzorani ◽  
Mauro Moretti ◽  
Daniel Vignaud
Keyword(s):  
Neutrino Oscillation ◽  
Solar Neutrino ◽  
Neutrino Experiments

BRANE-BULK NEUTRINO OSCILLATIONS

2001 ◽  
Vol 16 (supp01c) ◽  
pp. 934-936 ◽  
Author(s):  
ANDRÉ LUKAS ◽  
PIERRE RAMOND ◽  
ANDREA ROMANINO ◽  
GRAHAM G. ROSS
Keyword(s):  
Neutrino Oscillation ◽  
Small Angle ◽  
Solar Neutrino ◽  
Neutrino Oscillations ◽  
Sterile Neutrinos ◽  
Kaluza Klein

A plausible explanation for the existence of additional light sterile neutrinos is that they correspond to modulini, fermionic partners of moduli, which propagate in new large dimensions. We discuss the phenomenological implications of such states and show that solar neutrino oscillation is well described by small angle MSW oscillation to the tower of Kaluza Klein States associated with the Modulini. We also consider how all oscillation phenomena can be explained in a model including bulk neutrino states.

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