Cosmogenic neutrino fluxes under the effect of active-sterile secret interactions

Damiano Fiorillo (Dipartimento di Fisica “Ettore Pancini”, Università degli studi di Napoli Federico II, Complesso University Monte S. Angelo, I-80126 Napoli, Italy and INFN—Sezione di Napoli, Complesso University Monte S. Angelo, I-80126 Napoli, Italy) ; Gennaro Miele (Dipartimento di Fisica “Ettore Pancini”, Università degli studi di Napoli Federico II, Complesso University Monte S. Angelo, I-80126 Napoli, Italy and INFN—Sezione di Napoli, Complesso University Monte S. Angelo, I-80126 Napoli, Italy) ; Stefano Morisi (Dipartimento di Fisica “Ettore Pancini”, Università degli studi di Napoli Federico II, Complesso University Monte S. Angelo, I-80126 Napoli, Italy and INFN—Sezione di Napoli, Complesso University Monte S. Angelo, I-80126 Napoli, Italy) ; Ninetta Saviano (INFN—Sezione di Napoli, Complesso University Monte S. Angelo, I-80126 Napoli, Italy)

Ultra high energy cosmogenic neutrinos may represent a unique opportunity to unveil possible new physics interactions once restricted to the neutrino sector only. In the present paper we study the observable effects of a secret active-sterile interactions, mediated by a pseudoscalar, on the expected flux of cosmogenic neutrinos. The results show that for masses of sterile neutrinos and pseudoscalars of hundreds MeV, necessary to evade cosmological, astrophysical, and elementary particle constraints, the presence of such new interactions can significantly change the energy spectrum of cosmogenic neutrinos at Earth in the energy range from PeV to ZeV. Interestingly, the distortion of the spectrum results to be detectable at apparatus like GRAND or ARIANNA if the mediator mass is around 250 MeV and the UHECRs are dominated by the proton component. Larger mediator masses or a chemical composition of UHECRs dominated by heavier nuclei would require much larger cosmic rays apparatus which might be available in future.

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      "value": "Ultra high energy cosmogenic neutrinos may represent a unique opportunity to unveil possible new physics interactions once restricted to the neutrino sector only. In the present paper we study the observable effects of a secret active-sterile interactions, mediated by a pseudoscalar, on the expected flux of cosmogenic neutrinos. The results show that for masses of sterile neutrinos and pseudoscalars of hundreds MeV, necessary to evade cosmological, astrophysical, and elementary particle constraints, the presence of such new interactions can significantly change the energy spectrum of cosmogenic neutrinos at Earth in the energy range from PeV to ZeV. Interestingly, the distortion of the spectrum results to be detectable at apparatus like GRAND or ARIANNA if the mediator mass is around 250 MeV and the UHECRs are dominated by the proton component. Larger mediator masses or a chemical composition of UHECRs dominated by heavier nuclei would require much larger cosmic rays apparatus which might be available in future."
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Published on:
20 April 2020
Publisher:
APS
Published in:
Physical Review D , Volume 101 (2020)
Issue 8
DOI:
https://doi.org/10.1103/PhysRevD.101.083024
arXiv:
2002.10125
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

Fulltext files: