TeV-scale supersymmetric standard model with Higgs as a slepton

Recently it was pointed out that in the TeV-scale brane world there is a lo gical possibility where the electroweak Higgs can be identified with a four th generation slepton. In this paper we address various issues in this four -generation TeV-scale Supersymmetric Standard Model with Higgs as a slepton . In particular we discuss how to achieve proton stability by suppressing t he corresponding baryon number violating operators via gauging (a discrete subgroup of) the baryon number U(1) symmetry. Dimension five lepton number violating operators which would result in unacceptably large neutrino masse s can be similarly suppressed via gauging a discrete subgroup of the lepton number U(1) symmetry. In fact, the four generation feature allows for a no vel higher dimensional mechanism for generating small Majorana neutrino mas ses. We also discuss how to achieve gauge coupling unification, which can b e as precise at one loop as in the MSSM, and point out a possible geometric embedding of the corresponding matter content in the brane world context. Finally, we discuss adequate suppression of flavor changing neutral current s in this model, and also point out a novel possibility for supersymmetry b reaking via a non-zero F-term of the fourth generation lepton superfield. ( C) 1999 Published by Elsevier Science B.V. All rights reserved.