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Title: Low energy neutrino factory for large {theta}{sub 13}

Abstract

If the value of {theta}{sub 13} is within the reach of the upcoming generation of long-baseline experiments, T2K and NO{nu}A, we show that a low-energy neutrino factory, with peak energy in the few GeV range, would provide a sensitive tool to explore CP violation and the neutrino mass hierarchy. We consider baselines with the typical length 1000-1500 km. The unique performance of the low-energy neutrino factory is due to the rich neutrino oscillation pattern at energies between 1 and 4 GeV at baselines O(1000) km. We perform both a semianalytical study of the sensitivities and a numerical analysis to explore how well this setup can measure {theta}{sub 13}, CP violation, and determine the type of mass hierarchy and the {theta}{sub 23} octant. A low-energy neutrino factory provides a powerful tool to resolve ambiguities and make precise parameter determinations, for both large and fairly small values of the mixing parameter {theta}{sub 13}.

Authors:
; ;  [1];  [2];  [3];  [4]
  1. Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500 (United States)
  2. (United States)
  3. (Italy)
  4. (United Kingdom)
Publication Date:
OSTI Identifier:
21020465
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.75.093001; (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; CP INVARIANCE; GEV RANGE; KOBAYASHI-MASKAWA MATRIX; MATRIX ELEMENTS; NEUTRINO DETECTION; NEUTRINO OSCILLATION; NEUTRINO REACTIONS; NEUTRINOS; NUMERICAL ANALYSIS; REST MASS; SENSITIVITY

Citation Formats

Geer, Steve, Mena, Olga, Pascoli, Silvia, Theoretical Physics Department, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, INFN-Sezione di Roma, Dipartimento di Fisica, Universita di Roma 'La Sapienza', Piazzale Aldo Moro, 5, I-00185 Rome, and IPPP, Department of Physics, Durham University, Durham DH1 3LE. Low energy neutrino factory for large {theta}{sub 13}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.093001.
Geer, Steve, Mena, Olga, Pascoli, Silvia, Theoretical Physics Department, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, INFN-Sezione di Roma, Dipartimento di Fisica, Universita di Roma 'La Sapienza', Piazzale Aldo Moro, 5, I-00185 Rome, & IPPP, Department of Physics, Durham University, Durham DH1 3LE. Low energy neutrino factory for large {theta}{sub 13}. United States. doi:10.1103/PHYSREVD.75.093001.
Geer, Steve, Mena, Olga, Pascoli, Silvia, Theoretical Physics Department, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, INFN-Sezione di Roma, Dipartimento di Fisica, Universita di Roma 'La Sapienza', Piazzale Aldo Moro, 5, I-00185 Rome, and IPPP, Department of Physics, Durham University, Durham DH1 3LE. Tue . "Low energy neutrino factory for large {theta}{sub 13}". United States. doi:10.1103/PHYSREVD.75.093001.
@article{osti_21020465,
title = {Low energy neutrino factory for large {theta}{sub 13}},
author = {Geer, Steve and Mena, Olga and Pascoli, Silvia and Theoretical Physics Department, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500 and INFN-Sezione di Roma, Dipartimento di Fisica, Universita di Roma 'La Sapienza', Piazzale Aldo Moro, 5, I-00185 Rome and IPPP, Department of Physics, Durham University, Durham DH1 3LE},
abstractNote = {If the value of {theta}{sub 13} is within the reach of the upcoming generation of long-baseline experiments, T2K and NO{nu}A, we show that a low-energy neutrino factory, with peak energy in the few GeV range, would provide a sensitive tool to explore CP violation and the neutrino mass hierarchy. We consider baselines with the typical length 1000-1500 km. The unique performance of the low-energy neutrino factory is due to the rich neutrino oscillation pattern at energies between 1 and 4 GeV at baselines O(1000) km. We perform both a semianalytical study of the sensitivities and a numerical analysis to explore how well this setup can measure {theta}{sub 13}, CP violation, and determine the type of mass hierarchy and the {theta}{sub 23} octant. A low-energy neutrino factory provides a powerful tool to resolve ambiguities and make precise parameter determinations, for both large and fairly small values of the mixing parameter {theta}{sub 13}.},
doi = {10.1103/PHYSREVD.75.093001},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 75,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}
  • If the value of {theta}{sub 13} is within the reach of the upcoming generation of long-baseline experiments, T2K and NOvA, they show that a low-energy neutrino factory, with peak energy in the few GeV range, would provide a sensitive tool to explore CP-violation and the neutrino mass hierarchy. They consider baselines with typical length 1000-1500 km. The unique performance of the low energy neutrino factory is due to the rich neutrino oscillation pattern at energies between 1 and 4 GeV at baselines {Omicron}(1000) km. They perform both a semi-analytical study of the sensitivities and a numerical analysis to explore howmore » well this setup can measure {theta}{sub 13}, CP-violation, and determine the type of mass hierarchy and the {theta}{sub 23} quadrant. A low energy neutrino factory provides a powerful tool to resolve ambiguities and make precise parameter determinations, for both large and fairly small values of the mixing parameter {theta}{sub 13}.« less
  • An analysis of the neutrino oscillation physics capability of a low-energy neutrino factory is presented, including a first simulation of the detector efficiency and event energy threshold. The sensitivity of the physics reach to the presence of backgrounds is also studied. We consider a representative baseline of 1480 km, we use muons with 4.12 GeV energy and we exploit a very conservative estimate of the energy resolution of the detector. Our analysis suggests an impressive physics reach for this setup, which can eliminate degenerate solutions, for both large and small values of the mixing angle {theta}{sub 13}, and can determinemore » leptonic CP violation and the neutrino mass hierarchy with extraordinary sensitivity.« less
  • We investigate the deviation from tribimaximal mixing value and the reach of {theta}{sub 13} using neutrino factory at CERN and ICAL detector at INO.
  • In a new simple application of the non-Abelian discrete symmetry A{sub 4} to charged-lepton and neutrino mass matrices, we show that for the current experimental central value of sin{sup 2} 2{theta}{sub 13} Asymptotically-Equal-To 0.1, leptonic CP violation is necessarily large, i.e. Double-Vertical-Line tan{delta}{sub CP} Double-Vertical-Line > 1.3. We also consider T{sub 7} model with one parameter to be complex, thus allowing for one Dirac CP phase {delta}{sub CP} and two Majorana CP phases {alpha}{sub 1,2}. We find a slight modification to this correlation as a function of {delta}{sub CP}. For a given set of input values of {Delta}m{sup 2}{sub 21},more » {Delta}m{sup 2}{sub 32}, {theta}{sub 12}, and {theta}{sub 13}, we obtain sin{sup 2} 2{theta}{sub 23} and m{sub ee} (the effective Majorana neutrino mass in neutrinoless double beta decay) as functions of tan {delta}{sub CP}. We find that the structure of this model always yields small Double-Vertical-Line tan {delta}{sub CP} Double-Vertical-Line .« less
  • We discuss the minimum requirements for a neutrino beta beam if {theta}{sub 13} is discovered by an upcoming reactor experiment, such as Double Chooz or Daya Bay. We require that both neutrino mass hierarchy and leptonic CP violation can be measured to competitive precisions with a single-baseline experiment in the entire remaining {theta}{sub 13} range. For example, we find that a ({sup 18}Ne,{sup 6}He) beta beam from Fermilab to a water Cherenkov detector at Homestake with {gamma} > or approx. 190 could outperform practically any other beam technology including wide-band beam and neutrino factory.