scholarly journals Using low energy atmospheric neutrinos for precision measurement of the mixing parameters

2020 ◽  
Author(s):  
Hisakazu Minakata ◽  
Ivan Martinez-Soler ◽  
Kimihiro Okumura
Keyword(s):  
Precision Measurement ◽  
Low Energy ◽  
Atmospheric Neutrinos ◽  
Mixing Parameters

Oscillations of very low energy atmospheric neutrinos

2009 ◽  
Vol 79 (11) ◽  
Author(s):  
Orlando L. G. Peres ◽  
A. Yu. Smirnov
Keyword(s):  
Low Energy ◽  
Atmospheric Neutrinos

scholarly journals Fermion mass and mixing in a low-scale seesaw model based on the S4 flavor symmetry

2019 ◽  
Vol 2019 (11) ◽  
Author(s):  
V V Vien ◽  
H N Long ◽  
A E Cárcamo Hernández
Keyword(s):  
Low Energy ◽  
Spontaneous Breaking ◽  
Fermion Mass ◽  
Recent Experimental Data ◽  
Neutrino Masses ◽  
Flavor Symmetry ◽  
Seesaw Model ◽  
Mixing Parameters ◽  
The Masses ◽  
Good Agreement

Abstract We construct a low-scale seesaw model to generate the masses of active neutrinos based on $S_4$ flavor symmetry supplemented by the $Z_2 \times Z_3 \times Z_4 \times Z_{14}\times U(1)_L$ group, capable of reproducing the low-energy Standard Model (SM) fermion flavor data. The masses of the SM fermions and the fermionic mixing parameters are generated from a Froggatt–Nielsen mechanism after spontaneous breaking of the $S_4\times Z_2 \times Z_3 \times Z_4 \times Z_{14}\times U(1)_L$ group. The obtained values for the physical observables of the quark and lepton sectors are in good agreement with the most recent experimental data. The leptonic Dirac CP-violating phase $\delta _\mathrm{CP}$ is predicted to be $259.579^\circ$ and the predictions for the absolute neutrino masses in the model can also saturate the recent constraints.

scholarly journals Perturbing neutrino oscillations around the solar resonance

2019 ◽  
Vol 2019 (7) ◽  
Author(s):  
Ivan Martinez-Soler ◽  
Hisakazu Minakata
Keyword(s):  
Perturbation Theory ◽  
Cp Violation ◽  
Underlying Mechanism ◽  
Atmospheric Neutrinos ◽  
Mixing Parameters ◽  
Low Energies ◽  
Matter Effect ◽  
Characteristic Features ◽  
Higher Order Corrections ◽  
Source Of Information

Abstract Atmospheric neutrinos at low energies, $E \lesssim 500$ MeV, are known to be a rich source of information on lepton mixing parameters. We formulate a simple perturbative framework to elucidate the characteristic features of neutrino oscillation at around the solar-scale enhancement due to the matter effect. The clearest message that we could extract from our perturbation theory is that CP violation in the appearance oscillation probability is large, a factor of $\sim 10$ times larger than CP violation at around the atmospheric-scale oscillation maximum. The underlying mechanism for this is that one of the suppression factors on the CP phase-dependent terms due to the smallness of $\Delta m^2_{21} / \Delta m^2_{31}$ is dynamically lifted by the solar-scale enhancement. Our framework has a unique feature as a perturbation theory in which a large $\Delta m^2_{31}$ term outside the key 1-2 sector for the solar-scale resonance does not yield sizable corrections. On the contrary, the larger the $\Delta m^2_{31}$, the smaller the higher-order corrections.

scholarly journals Potential for precision measurement of low-energy antiprotons with GAPS for dark matter and primordial black hole physics

2014 ◽  
Vol 59 ◽  
pp. 12-17 ◽  
Author(s):  
T. Aramaki ◽  
S.E. Boggs ◽  
P. von Doetinchem ◽  
H. Fuke ◽  
C.J. Hailey ◽  
...  
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Precision Measurement ◽  
Black Hole Physics ◽  
Low Energy ◽  
Primordial Black Hole

Interactions of atmospheric neutrinos in nuclei at low energy

1986 ◽  
Vol 34 (3) ◽  
pp. 822-825 ◽  
Author(s):  
T. K. Gaisser ◽  
J. S. O’Connell
Keyword(s):  
Low Energy ◽  
Atmospheric Neutrinos

ICECUBE-DEEPCORE-PINGU: FUNDAMENTAL NEUTRINO AND DARK MATTER PHYSICS AT THE SOUTH POLE

2011 ◽  
Vol 26 (39) ◽  
pp. 2899-2915 ◽  
Author(s):  
D. JASON KOSKINEN
Keyword(s):  
Dark Matter ◽  
Atmospheric Neutrino ◽  
Neutrino Flux ◽  
Neutrino Telescope ◽  
Low Energy ◽  
Atmospheric Neutrinos ◽  
South Pole ◽  
The South ◽  
Original Design ◽  
Successful Observation

The IceCube neutrino observatory at the South Pole uses 1 km3 of instrumented ice to detect both astrophysical and atmospheric neutrinos. Expanding the capabilities of the original design, the DeepCore sub-array is a low-energy extension to IceCube which will collect [Formula: see text] atmospheric neutrinos a year. The high statistics sample will allow DeepCore to make neutrino oscillation measurements at higher energies and longer baselines than current experiments. The first successful observation of neutrino induced cascades in a neutrino telescope has recently been observed in DeepCore, which upon further cultivation should help refine atmospheric neutrino flux models. Besides the fundamental neutrino physics, the low-energy reach of DeepCore, down to as low as 10 GeV, and multi-megaton effective volume will enhance indirect searches for WIMP-like dark matter. A new proposal seeking to lower the energy reach down to [Formula: see text] GeV known as the Phased IceCube Next Generation Upgrade (or PINGU) will also be described.

scholarly journals Employing nucleon decay as a fingerprint of SUSY GUT models using SusyTCProton

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Stefan Antusch ◽  
Christian Hohl ◽  
Vasja Susič
Keyword(s):  
Software Tool ◽  
Decay Rates ◽  
Low Energy ◽  
Nucleon Decay ◽  
Mixing Parameters ◽  
Grand Unified Theories ◽  
Fermion Masses ◽  
Unified Theories ◽  
Rich Information ◽  
Gut Scale

Abstract While the observation of nucleon decay would be a smoking gun of Grand Unified Theories (GUTs) in general, the ratios between the decay rates of the various channels carry rich information about the specific GUT model realization. To investigate this fingerprint of GUT models in the context of supersymmetric (SUSY) GUTs, we present the software tool SusyTCProton, which is an extension of the module SusyTC to be used with the REAP package. It allows to calculate nucleon decay rates from the relevant dimension five GUT operators specified at the GUT scale, including the full loop-dressing at the SUSY scale. As an application, we investigate the fingerprints of two example GUT toy models with different flavor structures, performing an MCMC analysis to include the experimental uncertainties for the charged fermion masses and CKM mixing parameters. While both toy models provide equally good fits to the low energy data, we show how they could be distinguished via their predictions of ratios for nucleon decay rates. Together with SusyTCProton we also make the additional module ProtonDecay public. It can be used independently from REAP and allows to calculate nucleon decay rates from given D = 5 and D = 6 operator coefficients (accepting the required SUSY input for the D = 5 case in SLHA format). The D = 6 functionality can also be used to calculate nucleon decay in non-SUSY GUTs.

scholarly journals MuSun - Muon Capture on the Deuteron

2021 ◽  
Author(s):  
Peter Kammel
Keyword(s):  
Precision Measurement ◽  
Time Projection Chamber ◽  
Low Energy ◽  
Muon Capture ◽  
Energy Constant ◽  
Active Target ◽  
The Status ◽  
Time Projection

The MuSun experiment is a precision measurement of the rate for nuclear muon capture on the deuteron, designed to resolve a long-standing disagreement between experiment and theory, and to determine an important low-energy constant relevant for a variety of weak and strong dynamics. The experiment is based on a novel active target method employing a pure deuterium cryogenic time-projection chamber. The data taking was completed in two main campaigns and the analysis is well advanced. The unique challenges and corresponding strategy of the experiment as well as the status of the analysis are presented.

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