paper

Neutron Oscillations to Parallel World: Earlier End to the Cosmic Ray Spectrum?

arXiv:1109.3725 · doi:10.1140/epjc/s10052-012-2111-1

Abstract

Present experimental data do not exclude fast oscillation of the neutron to its degenerate twin from a hypothetical parallel sector, the so called mirror neutron . We show that this effect brings to a remarkable modifications of the ultrahigh-energy cosmic ray spectrum testable by the present Pierre Auger Observatory (PAO) and Telescope Array (TA) detector, and the future JEM-EUSO experiment. In particular, the baryon non-conservation during UHECR propagation at large cosmological distances shifts the beginning of the GZK cutoff to lower energies, while in presence of mirror sources it may enhance the spectrum at EeV. As a consequence, a significant reduction of the expected diffuse cosmogenic neutrino flux is predicted.

7 pages, 3 figures. Final version published in Eur. Phys. J. C

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