The upper bound on the lightest Higgs mass in the NMSSM revisited

We update the upper bound on the lightest CP-even Higgs mass in the NMSSM, which is given as a function of tan beta and lambda. It is pointed out that large values of tan beta, with lambda not too small, imply a large value for the MSSM-like parameter M-A. We include the available one- and two-loop corrections to the NMSSM Higgs masses, and constraints from the absence of Landau singularities below the GUT scale as well as from the stability of the NMSSM Higgs potential. For m(top) varying between 171.4 and 178 GeV, squark masses of 1 TeV and maximal mixing the upper bound is assumed near tan beta similar to 2 and varies between 139.9 and 141.4 GeV.