Trilepton Signal of Minimal Supergravity at the Tevatron Including $\ddot{I}„$-lepton Contributions

Abstract

The trilepton signal with missing transverse energy ($3\ell+\notE_T$, with $\ell =e$ or $\hat{I}¼$) from chargino-neutralino ($\ddot{I}{‡}_1^{\pm }\ddot{I}{‡}_2^0$) associated production and decays is studied for the upgraded Fermilab Tevatron Collider with 2 TeV center of mass energy and integrated luminosity of 2 fb${}^{-1}$ (MI) to 20 fb${}^{-1}$ (TeV33). In some regions of parameter space in the minimal supergravity model, $\ddot{I}{‡}_1^{\pm }$ and $\ddot{I}{‡}_2^0$ decay dominantly into final states with $\ddot{I}„$ leptons via real or virtual $\tilde{\ddot{I}}{„}_1$ sleptons. The contributions from $\ddot{I}„-$leptonic decays increase the trilepton signal from $\ddot{I}{‡}_1^{\pm }\ddot{I}{‡}_2^0$ by at least a factor of two when soft but realistic cuts on lepton transverse momenta are used. With the Main Injector, a trilepton signal can be detected at $\tan {\hat{I}}^2\equiv v_2/v_1\sim 3$ for universal masses $m_{1/2}, m_0 \alt$ 200 GeV.

13 pages, REVTEX, 4 figures