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Title: Probing deviations from tribimaximal mixing through ultrahigh energy neutrino signals

Abstract

We investigate deviation from the tribimaximal mixing in the case of ultrahigh energy neutrino using the ICECUBE detector. We consider the ratio of the number of muon tracks to the shower generated due to eletrons and hadrons. Our analysis shows that for tribimaximal mixing the ratio comes out around 4.05. Keeping {theta}{sub 12} and {theta}{sub 23} fixed at tribimaximal value, we have varied the angle {theta}{sub 13}=3 deg. , 6 deg. , 9 deg. and the value of the ratio gradually decreases. The variation of ratio lies within 8% to 18% from the tribimaximal mixing value and it is very difficult to detect such a small variation by the ICECUBE detector.

Authors:
;  [1]
  1. Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700 064 (India)
Publication Date:
OSTI Identifier:
20929536
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevD.75.113004; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; HADRONS; MUONS; NEUTRINOS; PARTICLE TRACKS; SIGNALS

Citation Formats

Majumdar, Debasish, and Ghosal, Ambar. Probing deviations from tribimaximal mixing through ultrahigh energy neutrino signals. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.113004.
Majumdar, Debasish, & Ghosal, Ambar. Probing deviations from tribimaximal mixing through ultrahigh energy neutrino signals. United States. doi:10.1103/PHYSREVD.75.113004.
Majumdar, Debasish, and Ghosal, Ambar. Fri . "Probing deviations from tribimaximal mixing through ultrahigh energy neutrino signals". United States. doi:10.1103/PHYSREVD.75.113004.
@article{osti_20929536,
title = {Probing deviations from tribimaximal mixing through ultrahigh energy neutrino signals},
author = {Majumdar, Debasish and Ghosal, Ambar},
abstractNote = {We investigate deviation from the tribimaximal mixing in the case of ultrahigh energy neutrino using the ICECUBE detector. We consider the ratio of the number of muon tracks to the shower generated due to eletrons and hadrons. Our analysis shows that for tribimaximal mixing the ratio comes out around 4.05. Keeping {theta}{sub 12} and {theta}{sub 23} fixed at tribimaximal value, we have varied the angle {theta}{sub 13}=3 deg. , 6 deg. , 9 deg. and the value of the ratio gradually decreases. The variation of ratio lies within 8% to 18% from the tribimaximal mixing value and it is very difficult to detect such a small variation by the ICECUBE detector.},
doi = {10.1103/PHYSREVD.75.113004},
journal = {Physical Review. D, Particles Fields},
number = 11,
volume = 75,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2007},
month = {Fri Jun 01 00:00:00 EDT 2007}
}
  • Current experimental data allow the zero value for one neutrino mass, either m{sub 1}=0 or m{sub 3}=0. This observation implies that a realistic neutrino mass texture can be established by starting from the limit (a) m{sub 1}=m{sub 2}=0 and m{sub 3}{ne}0 or (b) m{sub 1}=m{sub 2}{ne}0 and m{sub 3}=0. In both cases, we may introduce a particular perturbation which ensures the resultant neutrino mixing matrix to be the tribimaximal mixing pattern or its viable variations with all entries being formed from small integers and their square roots. We find that it is natural to incorporate this kind of neutrino massmore » matrix in the minimal type-II seesaw model with only one heavy right-handed Majorana neutrino N in addition to the SU(2){sub L} Higgs triplet {delta}{sub L}. We show that it is possible to account for the cosmological baryon number asymmetry in the m{sub 3}=0 case via thermal leptogenesis, in which the one-loop vertex correction to N decays is mediated by {delta}{sub L} and the CP-violating asymmetry of N decays is attributed to the electron flavor.« less
  • We analyze the effects of charged lepton corrections and renormalization group (RG) running on the low energy predictions of theories which accurately predict tri-bimaximal neutrino mixing at the high energy scale. In particular we focus on grand unified theory (GUT) inspired seesaw models with accurate tri-bimaximal neutrino mixing at the GUT scale, in which the charged lepton corrections are Cabibbo-like and give rise to sum rules valid at the GUT scale. We study numerically the RG corrections to a variety of such neutrino mixing sum rules in order to assess their accuracy and reliability when comparing them to future lowmore » energy neutrino oscillation experiments. Our results indicate that the RG corrections to neutrino mixing sum rules are typically small (less than one degree), at least in the examples studied with hierarchical neutrinos.« less
  • No abstract prepared.
  • The addition of an A{sub 4} family symmetry and extended Higgs sector to the standard model can generate the tribimaximal mixing pattern for leptons, assuming the correct vacuum expectation value alignment of the Higgs scalars. Deviating this alignment affects the predictions for the neutrino oscillation and neutrino mass observables. An attempt is made to classify the plethora of models in the literature, with respect to the chosen A{sub 4} particle assignments. Of these models, two particularly popular examples have been analyzed for deviations from tribimaximal mixing by perturbing the vacuum expectation value alignments. The effect of perturbations on the mixingmore » angle observables is studied. However, it is only investigation of the mass-related observables (the effective mass for neutrinoless double beta decay and the sum of masses from cosmology) that can lead to the exclusion of particular models by constraints from future data, which indicates the importance of neutrino mass in disentangling models. The models have also been tested for fine-tuning of the parameters. Furthermore, a well-known seesaw model is generalized to include additional scalars, which transform as representations of A{sub 4} not included in the original model.« less