Search for neutral weakly interacting massive particles in the Fermilab Tevatron wideband neutrino beam.

A time-of-flight technique has been used to search for neutral weakly interacting massive particles in the wideband neutrino beam at the Fermilab Tevatron. Limits at the 90% confidence level are reported herein for (a) heavy neutrino production from the decay of heavy quark states, (b) massive objects directly produced in 800 GeV/{ital c} pN interactions that are noninteracting but unstable with a mean lifetime between 10{sup {minus}8} and 10{sup {minus}4} s, and (c) directly produced massive objects that are stable but weakly interacting with interaction cross sections between 10{sup {minus}29} and 10{sup {minus}31} cm{sup 2}.