Determination of absolute neutrino masses from Z-bursts

Details Determination of absolute neutrino masses from Z-bursts Determination of absolute neutrino masses from Z-bursts

2001-05-07

arxiv.org/abs/hep-ph/0105064v2

Phys.Rev.Lett. 88 (2002) 171101

Physics

High Energy Physics

High Energy Physics - Phenomenology

slight rewording, revised neutrino fluxes, conclusions unchanged, version to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.88.171101

Ultrahigh energy neutrinos (UHE\nu) scatter on relic neutrinos (R\nu) producing Z bosons, which can decay hadronically producing protons (Z-burst). We compare the predicted proton spectrum with the observed ultrahigh energy cosmic ray (UHECR) spectrum and determine the mass of the heaviest R\nu via a maximum likelihood analysis. Our prediction depends on the origin of the power-like part of the UHECR spectrum: m_\nu=2.75^{+1.28}_{-0.97} eV for Galactic halo and 0.26^{+0.20}_{-0.14} eV for extragalactic (EG) origin. The necessary UHE\nu flux should be detected in the near future.

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