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Physical Review D

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Probing neutrino flavor transition mechanism with ultrahigh energy astrophysical neutrinos

Kwang-Chang Lai^1,2,*, Guey-Lin Lin^3,2, and Tsung-Che Liu²

¹Center for General Education, Chang Gung University, Kwei-Shan, Taoyuan 333, Taiwan
²Leung Center for Cosmology and Particle Astrophysics (LeCosPA), National Taiwan University, Taipei 106, Taiwan
³Institute of Physics, National Chiao Tung University, Hsinchu 300, Taiwan

^*kcl@mail.cgu.edu.tw

Phys. Rev. D 89, 033002 – Published 6 February, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.033002

Abstract

Observation of ultrahigh energy astrophysical neutrinos and identification of their flavors have been proposed for future neutrino telescopes. The flavor ratio of astrophysical neutrinos observed on the Earth depends on both the initial flavor ratio at the source and flavor transitions taking place during propagations of these neutrinos. The flavor transition mechanisms are well classified with our model-independent parametrization. We find that a new parameter $R \equiv ϕ_{e} / (ϕ_{μ} + ϕ_{τ})$ can probe directly the flavor transition in the framework of our model-independent parametrization, without the assumption of the $ν_{μ} − ν_{τ}$ symmetry. A few flavor-transition models are employed to test our parametrization with this new observable. The observational constraints on flavor transition mechanisms by the new observable are discussed through our model-independent parametrization.

See Also

Flavor transition mechanisms of propagating astrophysical neutrinos: A model independent parametrization

Kwang-Chang Lai, Guey-Lin Lin, and T. C. Liu

Phys. Rev. D 82, 103003 (2010)

Article Text

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