- Conference date: 8-12 September 2003
- Location: Sante Fe, New Mexico (USA)
The neutrino oscillation in GRB fireballs is studied by assuming the fireball as a plasma of photons and electrons‐positrons. We show that, in this medium, only the ve ↔ v μ,τ oscillation can take place resonantly depending on the fireball parameters. On the other hand the v̄e ↔ v̄ μ,τ oscillation is supressed. In most of the models for producing the GRB, the central engine will produce more ve and v̄e then v μ, v τ and the corresponding anti‐neutrinos. When these propagate through the fireball, they will undergo resonant conversion from one type to another and because of the higher flux of ve , the probability of obtaining v μ and v τ will be higher then in the reverse process, thus enhancing the fluxes of v μs and v τs.
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