Search for New Particles Decaying into $\mathit{b}\overline{\mathit{b}}$ and Produced in Association with $\mathit{W}$ Bosons Decaying into $\mathit{e}\mathit{\nu }$ or $\mathit{\mu }\mathit{\nu }$ at the Fermilab Tevatron

We search for new particles that decay into $b\overline{b}$ and are produced with $W$ bosons in $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{}\mathrm{TeV}$. The search uses $109\pm 7{\mathrm{pb}}^{-1\mathrm{}}$ accumulated by the CDF experiment at Fermilab. We select events with an $e\nu$ or $\mu \nu$, and two jets, one of them $b$ tagged. The number of events and the two-jet mass distribution are consistent with expectations. Using $W+\mathrm{Higgs}$ production as a model for the acceptance, we set an upper limit on the production cross section times branching ratio for the new particle ranging from 14 to 19 pb (95% C.L.) as the particle mass varies from 70 to $120\mathrm{GeV}{/c}^2$.