Possible sneutrino-pair signatures with R-parity breaking

Abstract

If sneutrinos are the lightest supersymmetry partners and $R$-parity is not conserved, the process $e^+e^- \to \tilde {\barν} \tilde ν$ can have striking signatures due to the decay modes $\tildeν\to\ell^+\ell'^-$ or $\tildeν\to q \bar q'$. We present cross section formulas and discuss event rates and detection at the upgraded $e^+e^-$ collider LEP. Four-lepton signals should be detectable up to sneutrino mass $\tilde {m}_ν= 80$ GeV and maybe beyond; four-jet signals should be detectable up to $\tilde {m}_ν= 70$ GeV, but would probably be obscured thereafter by $WW$ background.

standard Latex, 9 pages, 2 uufiled postscript figures included via figures command. Compressed postscript version with figures available at http://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-903.ps.Z or ftp://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-903.ps.Z