OperaV1, Main, Exploration, bibRecord, 000926

BEAMING NEUTRINOS AND ANTI-NEUTRINOS ACROSS THE EARTH TO DISENTANGLE NEUTRINO MIXING PARAMETERS

Identifieur interne : 000926 ( Main/Exploration ); précédent : 000925; suivant : 000927

BEAMING NEUTRINOS AND ANTI-NEUTRINOS ACROSS THE EARTH TO DISENTANGLE NEUTRINO MIXING PARAMETERS

Auteurs : Daniele Fargion [Italie] ; Daniele D'Armiento [Italie] ; Paolo Desiati [États-Unis] ; Paolo Paggi [Italie]

Source :

The Astrophysical journal [ 0004-637X ] ; 2012.

RBID : Pascal:12-0410344

Descripteurs français

Pascal (Inist)
- Neutrino muonique, Mélangeage, Violation parité, Invariance CPT, Lepton tau, Flaveur, Hiérarchie, Masse neutrino, Anisotropie, Asymétrie, Oscillation neutrino, Diamètre, CERN, Courant neutre, Matrice détecteur, Rayonnement cosmique, Nucléosynthèse, Abondance, Particule sans masse, Masse particule élémentaire, Particule élémentaire.
Wicri :
- topic : Particule élémentaire.

English descriptors

KwdEn :
- Abundance, Anisotropy, Asymmetry, CERN, CPT invariance, Cosmic radiation, Dectector arrays, Diameter, Elementary particle mass, Elementary particles, Flavor, Hierarchy, Massless particles, Mixing, Muon neutrinos, Neutral currents, Neutrino mass, Neutrino oscillations, Nucleosynthesis, Parity violation, Tau leptons.

Abstract

A result from MINOS seemed to indicate that the mass splitting and mixing angle of anti-neutrinos is different from that of neutrinos, suggesting a charge-parity-time (CPT) violation in the lepton sector. However, more recent MINOS data reduced the ν_μ-ν_μ differences leading to a narrow discrepancy nearly compatible with no CPT violation. However, the last few years of OPERA activity on the appearance of a tau lepton (one unique event) still has not been probed and more tools may be required to disentangle a list of parameters (μ-τ flavor mixing, tau appearance, any eventual CPT violation, θ₁₃ angle value, and any hierarchy neutrino mass). Atmospheric anisotropy in muon neutrino spectra in the DeepCore, at ten to tens of GeV (unpublished), can hardly reveal asymmetry in the eventual ν_μ-ν_μ oscillation parameters. Here we considered how the longest baseline neutrino oscillation available, crossing most of Earth's diameter, may improve the measurement and at best disentangle any hypothetical CPT violation occurring between the earliest (2010) and the present (2012) MINOS bounds (with 6σ a year), while testing τ and even the appearance of τ at the highest rate. The ν_μ and ν_μ disappearance correlated with the tau appearance is considered for those events at the largest distances. We thus propose a beam of ν_μ and ν_μ crossing through the Earth, within an OPERA-like experiment from CERN (or Fermilab), in the direction of the IceCube-DeepCore ν detector at the South Pole. The ideal energy lies at 21 GeV to test the disappearance or (for any tiny CPT violation) the partial ν_μ appearance. Such a tuned detection experiment may lead to a strong signature of τ or τ generation even within its neutral current noise background events: nearly one τ or two τ a day. The tau appearance signal is above (or within) 10σ a year, even for a 1% OPERA-like experiment. Peculiar configurations for θ₁₃ and the hierarchy neutrino mass test may also be better addressed by a DeepCore-PINGU array detector beaming ν_μ and observing ν_e at 6 GeV neutrino energy windows.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">A result from MINOS seemed to indicate that the mass splitting and mixing angle of anti-neutrinos is different from that of neutrinos, suggesting a charge-parity-time (CPT) violation in the lepton sector. However, more recent MINOS data reduced the ν<sub>μ</sub>
-ν<sub>μ</sub>
 differences leading to a narrow discrepancy nearly compatible with no CPT violation. However, the last few years of OPERA activity on the appearance of a tau lepton (one unique event) still has not been probed and more tools may be required to disentangle a list of parameters (μ-τ flavor mixing, tau appearance, any eventual CPT violation, θ<sub>13</sub>
 angle value, and any hierarchy neutrino mass). Atmospheric anisotropy in muon neutrino spectra in the DeepCore, at ten to tens of GeV (unpublished), can hardly reveal asymmetry in the eventual ν<sub>μ</sub>
-ν<sub>μ</sub>
 oscillation parameters. Here we considered how the longest baseline neutrino oscillation available, crossing most of Earth's diameter, may improve the measurement and at best disentangle any hypothetical CPT violation occurring between the earliest (2010) and the present (2012) MINOS bounds (with 6σ a year), while testing τ and even the appearance of τ at the highest rate. The ν<sub>μ</sub>
 and ν<sub>μ</sub>
 disappearance correlated with the tau appearance is considered for those events at the largest distances. We thus propose a beam of ν<sub>μ</sub>
 and ν<sub>μ</sub>
 crossing through the Earth, within an OPERA-like experiment from CERN (or Fermilab), in the direction of the IceCube-DeepCore ν detector at the South Pole. The ideal energy lies at 21 GeV to test the disappearance or (for any tiny CPT violation) the partial ν<sub>μ</sub>
 appearance. Such a tuned detection experiment may lead to a strong signature of τ or τ generation even within its neutral current noise background events: nearly one τ or two τ a day. The tau appearance signal is above (or within) 10σ a year, even for a 1% OPERA-like experiment. Peculiar configurations for θ<sub>13</sub>
 and the hierarchy neutrino mass test may also be better addressed by a DeepCore-PINGU array detector beaming ν<sub>μ</sub>
 and observing ν<sub>e</sub>
 at 6 GeV neutrino energy windows.</div>
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BEAMING NEUTRINOS AND ANTI-NEUTRINOS ACROSS THE EARTH TO DISENTANGLE NEUTRINO MIXING PARAMETERS

BEAMING NEUTRINOS AND ANTI-NEUTRINOS ACROSS THE EARTH TO DISENTANGLE NEUTRINO MIXING PARAMETERS

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri