Measuring CP violation by low-energy medium-baseline neutrino
  oscillation experiments

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Abstract

In this talk we discuss the possibility to measure CP violation in neutrino oscillation experiments using the neutrino beam with energy which is lower (E_\nu \gsim 100 MeV) than the one usually considered (typically > 1 GeV) in accelerator experiments. The advantage of using such lower energy neutrino beam is that despite the smaller detection cross sections, the effect of CP violation is larger and the optimal length of baseline can be rather short, 30-50 km, being free from matter effect contamination.

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CP-Violation in the Renormalizable Theory of Weak Interaction

Makoto Kobayashi, Toshihide Maskawa (1973)

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CP Violation vs. Matter Effect in Long-Baseline Neutrino Oscillation Experiments

Hisakazu Minakata, Hiroshi Nunokawa (1997)

We investigate, within the framework of three generations of neutrinos, the effects of CP violation in long-baseline neutrino oscillation experiments. We aim at illuminating the global feature of the interplay between genuine effect due to the CP violating phase and a fake one due to the earth matter effect. To this goal, we develop a formalism based on the adiabatic approximation and perturbative treatment of the matter effect which allows us to obtain approximate analytic expressions of the oscillation probabilities. We present an order-of-magnitude estimation and a detailed numerical computation of the absolute and the relative magnitudes of the CP violations under the mass hierarchy suggested by the atmospheric neutrino anomaly and the cosmological dark matter. We find that the genuine CP violating effect is at most \sim 1%, and the matter effect dominates over the intrinsic CP violation only in a region of parameters where the oscillation probability of \(\nu_\mu\to\nu_e\) is large.

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Author and article information

Journal

Publication date Created: 07 September 2000

Article

DOI: 10.1016/S0168-9002(01)01281-5

ArXiV ID: hep-ph/0009091

SO-VID: eb1164b8-a797-4424-a50c-f6f1a3bc8b75

History

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Journal reference Nucl.Instrum.Meth. A472 (2000) 421-426

Comments 5 pages with 2 postscript figures, uses espcrc2.sty, Talk presented by H. Nunokawa at ``NuFact'00'' workshop, Monterey, CA, USA, May 22-26, 2000

Categories hep-ph

ScienceOpen disciplines: High energy & Particle physics

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ScienceOpen disciplines: High energy & Particle physics