Trilepton Signal of Minimal Supergravity at the Tevatron Including $\tau$-lepton Contributions

Abstract

The trilepton signal with missing transverse energy ($3\ell+\notE_T$, with $\ell =e$ or $\mu$) from chargino-neutralino (${\chi }_1^{\pm }{\chi }_2^0$) 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, ${\chi }_1^{\pm }$ and ${\chi }_2^0$ decay dominantly into final states with $\tau$ leptons via real or virtual ${\tilde{\tau }}_1$ sleptons. The contributions from $\tau -$leptonic decays increase the trilepton signal from ${\chi }_1^{\pm }{\chi }_2^0$ 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 $\tan \beta \equiv v_2/v_1\sim 3$ for universal masses $m_{1/2}, m_0 \alt$ 200 GeV.

13 pages, REVTEX, 4 figures

References in corpus (1)

• Supersymmetry Reach of Tevatron Upgrades: The Large $\tan \beta$ Case

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