Bounds on Dirac Neutrino Masses from Nucleosynthesis

Details Bounds on Dirac Neutrino Masses from Nucleosynthesis Bounds on Dirac Neutrino Masses from Nucleosynthesis

1994-07-28

arxiv.org/abs/hep-ph/9407395v1

Phys.Rev.D51:4129-4133,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, UM-TH-94-21, UMN-TH-1303-94, FERMILAB-Pub-94/199-A

Scientific paper

10.1103/PhysRevD.51.4129

We derive new bounds on the Dirac mass of the tau and muonic neutrinos. By solving the kinetic equation for the rate of energy deposition due to helicity flipping processes and imposing the constraint that the number of effective species contributing to the energy density at the time of nucleosynthesis be $\Delta k_\nu<~0.3$, we find the bounds $m_{\nu_\mu} < ~150$ KeV and $m_{\nu_\tau} < ~190$ KeV for $T_{\rm QCD}= 200$ MeV. The constraint $\Delta k_\nu~<0.1~$ leads to the much stronger bound $m_\nu <10$ KeV for both species of neutrinos.

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