Mass spectrum of the minimal SUSY B-L model

Abstract

The origin of R-parity in supersymmetric models can be explained if \BL is part of the gauge group. We discuss the mass spectrum of the minimal $U(1{)}_Y\times U(1{)}_{B-L}$ model based on a GUT implementation using CMSSM-like boundary conditions. Here we focus in particular on the Higgs and neutralino sectors in this class of models. While the neutralinos can have masses as low as 100 GeV, we show that the requirement of being consistent with existing bounds on the $Z^{\prime }$ implies that in general the sfermions have masses in the multi-TeV range. In the extended Higgs sector we show the existence of a second light state which, however, will be difficult to observe, while having at the same time a SM-like Higgs in a mass range of 123-126 GeV.. Moreover, we propose a set of benchmark scenarios for phenomenological studies. On the technical side we demonstrate that gauge kinetic mixing effects can be quite important, affecting in particular the Higgs and the neutralino sectors. Not only can they shift the mass of the lightest neutralino by about 10 per-cent but also they can change the nature of neutralinos and Higgs bosons in a significant way.

37 pages; 14 figures; v2: updated benchmark points and corresponding figures, extended discussions, conclusions unchanged

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