On in situ Determination of Earth Matter Density in Neutrino Factory

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dc.creatorMinakata, Hisakazu
dc.creatorUchinami, Shoichi
dc.date2006-12-01
dc.date2007-03-16
dc.date.accessioned2026-07-07T10:37:29Z
dc.date.available2026-07-07T10:37:29Z
dc.descriptionWe point out that an accurate in situ determination of the earth matter density ρis possible in neutrino factory by placing a detector at the magic baseline, L = \sqrt{2} π/ G_{F} N_{e} where N_{e} denotes electron number density. The accuracy of matter density determination is excellent in a region of relatively large theta_{13} with fractional uncertainty δρ/ ρof about 0.43%, 1.3%, and \lsim 3% at 1 sigma CL at sin^2 2theta_{13}=0.1, 10^{-2}, and 3 x 10^{-3}, respectively. At smaller theta_{13} the uncertainty depends upon the CP phase delta, but it remains small, 3%-7% in more than 3/4 of the entire region of delta at sin^2 2theta_{13} = 10^{-4}. The results would allow us to solve the problem of obscured CP violation due to the uncertainty of earth matter density in a wide range of theta_{13} and delta. It may provide a test for the geophysical model of the earth, or it may serve as a method for stringent test of the MSW theory of neutrino propagation in matter once an accurate geophysical estimation of the matter density is available.
dc.description21 pages, 4 figures, version to appear in PRD
dc.identifierhttps://arxiv.org/abs/hep-ph/0612002
dc.identifierhttp://arxiv.org/abs/hep-ph/0612002
dc.identifierPhys.Rev.D75:073013,2007
dc.identifierdoi:10.1103/PhysRevD.75.073013
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/180395
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.subjectGeophysics
dc.titleOn in situ Determination of Earth Matter Density in Neutrino Factory
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