Cosmological bounds on the lifetime of a fourth generation charged lepton

Details Cosmological bounds on the lifetime of a fourth generation charged lepton Cosmological bounds on the lifetime of a fourth generation charged lepton

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phlb..285..336s&link_type=abstract

Physics Letters B, Volume 285, Issue 4, p. 336-342.

Physics

11

Scientific paper

If a fourth generation of leptons exists, both the neutrino and the charged lepton must have masses in excess of 45 GeV. It is certainly possible that the neutrino will be the heavier of the two. In this case, the charged lepton can only decay through mixing with lighter generations, and might thus be extremely long-lived. We calculate the bounds on the mass and lifetime of long-lived charged particles which arise from terrestrial experiments, from astrophysical searches for the decay products and from cosmology. The strongest bounds come from the requirement that the decay products not unacceptably distort the cosmic microwave background. Phenomenological implications are also briefly discussed.

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