## PTPlot: $Z_2$-symmetric singlet scalar benchmark points

Benchmark points for the SM extended with a scalar singlet with $Z_2$ symmetry (supplied by J. Kozaczuk).

The new physics potential reads $$\Delta V = \frac{1}{2}a_2 |H|^2 S^2 + \frac{1}{2} b_2 S^2 + \frac{1}{4} b_4 S^4.$$ The parameter $m$ below stands for the physical mass of the singlet. For each pair $(m, a_2)$, the remaining free parameter, namely the singlet self coupling $b_4$, is taken to be the one that maximizes the strength of the phase transition, computed using a modified version of CosmoTransitions (see https://arxiv.org/abs/1109.4189).

General parameters used for plotting: $v_\mathrm{w} = 1.0$, $T_* = 50.0 \, \mathrm{GeV}$ (when all points are plotted), $g_* = 106.75$.

Mission profile: Science Requirements Document (3 years)