### The Mu and Tau Number of SupernovaeThe Mu and Tau Number of Supernovae

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 Author Horowitz, C. J. ♦ Li, Gang Source arXiv.org Content type Text File Format PDF Date of Submission 1998-09-22 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Astronomy & allied sciences ♦ Physics Subject Keyword High Energy Physics - Phenomenology ♦ Astrophysics ♦ Nuclear Theory ♦ physics:astro-ph ♦ physics:hep-ph ♦ physics:nucl-th Abstract The neutrino-nucleon cross section is slightly larger than that for $\bar\nu-N$. Therefore, $\bar\nu$ will escape more quickly from core collapse supernovae leaving the star $\nu$ rich. A diffusion formalism is used to calculate the time evolution of the mu and tau lepton number densities. These quickly reach steady state equilibria. We estimate that a protoneutron star with a maximum temperature near 50 MeV will contain over 50 % more $\nu_\mu$ and $\nu_\tau$ than $\bar\nu_\mu$ and $\bar\nu_\tau$. Supernovae may be the only known systems with large mu and or tau lepton numbers. Description Reference: Phys.Lett. B443 (1998) 58-62 Educational Use Research Learning Resource Type Article Page Count 5