Present experimental data do not exclude fast oscillation of the neutron n to its degenerate twin from a hypothetical parallel sector, the so called mirror neutron n'. We show that this effect brings about remarkable modifications of the ultra-high energy cosmic ray spectrum testable by the present Pierre Auger Observatory and Telescope Array 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 E > 100 EeV. As a consequence, one can expect a significant reduction of the diffuse cosmogenic neutrino flux.
|Titolo:||Neutron oscillations to parallel world: earlier end to the cosmic ray spectrum?|
|Autori interni:||BEREJIANI, ZOURAB|
|Data di pubblicazione:||2012|
|Rivista:||THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS|
|Appare nelle tipologie:||1.1 Articolo in rivista|