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NOvA and T2K: The Race for the neutrino mass hierarchy

Description: The determination of the ordering of the neutrino masses (the hierarchy) is probably a crucial prerequisite to understand the origin of lepton masses and mixings and to establish their relationship to the analogous properties in the quark sector. Here, we follow an alternative strategy to the usual neutrino-antineutrino comparison in long baseline neutrino oscillation experiments: we exploit the combination of the neutrino-only data from the NOvA and the T2K experiments by performing these two off-axis experiments at different distances but at the same <E>/L, where <E> is the mean neutrino energy and L is the baseline. This would require a minor adjustment to the proposed off-axis angle for one or both of the proposed experiments.
Date: September 1, 2006
Creator: Mena, Olga; /Fermilab; Nunokawa, Hiroshi; /Rio de Janeiro, Pont. U. Catol.; Parke, Stephen J. & /Fermilab
Partner: UNT Libraries Government Documents Department

On the mass eigenstate purity of Boron-8 solar neutrinos

Description: We give a brief report on our recent paper, Ref. [1], in which we calculate the {nu}{sub 2} mass eigenstate purity of {sup 8}B solar neutrinos as 91 {+-} 2%.
Date: January 1, 2006
Creator: Parke, Stephen J.; /Fermilab; Nunokawa, Hiroshi; /Rio de Janeiro, Pont. U. Catol.; Zukanovich Funchal, Renata & U., /Sao Paulo
Partner: UNT Libraries Government Documents Department

Determining neutrino mass hierarchy by precise measurements of two delta m**2 in electron-neutrino and muon-neutrino disappearance experiments

Description: In this talk, the authors discuss the possibility of determining the neutrino mass hierarchy by comparing the two effective atmospheric neutrino mass squared differences measured, respectively, in electron, and in muon neutrino disappearance oscillation experiments. if the former, is larger (smaller) than the latter, the mass hierarchy is of normal (inverted) type. They consider two very high precision (a few per mil) measurements of such mass squared differences by the phase II of the T2K (Tokai-to-Kamioka) experiment and by the novel Moessbauer enhanced resonant {bar {nu}}{sub e} absorption technique. Under optimistic assumptions for the systematic errors of both measurements, they determine the region of sensitivities where the mass hierarchy can be distinguished. Due to the tight space limitation, they present only the general idea and show a few most important plots.
Date: September 1, 2006
Creator: Minakata, H.; U., /Tokyo Metropolitan; Nunokawa, H.; /Rio de Janeiro, Pont. U. Catol.; Parke, Stephen J.; /Fermilab et al.
Partner: UNT Libraries Government Documents Department

Determining neutrino mass hierarchy by precision measurements in electron and muon neutrino disappearance experiments

Description: Recently a new method for determining the neutrino mass hierarchy by comparing the effective values of the atmospheric {Delta}m{sup 2} measured in the electron neutrino disappearance channel, {Delta}m{sup 2}(ee), with the one measured in the muon neutrino disappearance channel, {Delta}m{sup 2}({mu}{mu}), was proposed. If {Delta}m{sup 2}(ee) is larger (smaller) than {Delta}m{sup 2} ({mu}{mu}) the hierarchy is of the normal (inverted) type. We re-examine this proposition in the light of two very high precision measurements: {Delta}m{sup 2}({mu}{mu}) that may be accomplished by the phase II of the Tokai-to-Kamioka (T2K) experiment, for example, and {Delta}m{sup 2}(ee) that can be envisaged using the novel Moessbauer enhanced resonant {bar {nu}}{sub e} absorption technique. Under optimistic assumptions for the systematic uncertainties of both measurements, we estimate the parameter region of ({theta}{sub 13}, {delta}) in which the mass hierarchy can be determined. If {theta}{sub 13} is relatively large, sin{sup 2} 2{theta}{sub 13} {approx}> 0.05, and both of {Delta}m{sup 2}(ee) and {Delta}m{sup 2}({mu}{mu}) can be measured with the precision of {approx} 0.5 % it is possible to determine the neutrino mass hierarchy at > 95% CL for 0.3{pi} {approx}< {delta} {approx}< 1.7 {pi} for the current best fit values of all the other oscillation parameters.
Date: July 1, 2006
Creator: Minakata, H.; U., /Tokyo Metropolitan; Nunokawa, H.; /Rio de Janeiro, Pont. U. Catol.; Parke, S.J.; /Fermilab et al.
Partner: UNT Libraries Government Documents Department

Mass Hierarchy via Mossbauer and Reactor Neutrinos

Description: The authors show how one could determine the neutrino mass hierarchy with Moessbauer neutrinos and also revisit the questions of whether the hierarchy can be determined with reactor neutrinos.
Date: December 1, 2008
Creator: Parke, Stephen J.; /Fermilab; Minakata, Hisakazu; U., /Tokyo Metropolitan; Nunokawa, Hiroshi; /Rio de Janeiro, Pont. U. Catol. et al.
Partner: UNT Libraries Government Documents Department

Why do a precision measurement of delta m(atm)**2 in the electron-neutrino and anti-electron-neutrino disappearance channel?

Description: We discuss why high precision measurements of {delta}m{sub atm}{sup 2} in the {nu}{sub e}/{bar {nu}}{sub e} disappearance channels would be desirable in conjunction with the {delta}m{sub atms}{sup 2} high precision measurements that will be performed in the {nu}{sub {mu}} and {bar {nu}}{sub {mu}} disappearance channels by long baseline experiments such as T2K and NOvA. We show that if these measurements can achieve the challenging precision of about 0.5%, it will be possible to determine the mass hierarchy of the neutrino sector without the need of matter effects.
Date: July 1, 2005
Creator: Nunokawa, H.; /Rio de Janeiro, Pont. U. Catol.; Parke, Stephen J.; /Fermilab; Zukanovich Funchal, R. & U., /Sao Paulo
Partner: UNT Libraries Government Documents Department