Speaker
Description
Two Higgs doublet models (2HDM) are one of the simplest and most popular extensions to the SM and predict very different scalar interactions compared to the SM. These new interactions include new triple couplings of the SM-like Higgs bosons with itself and with the new Higgs bosons present in the 2HDM. In consequence, these new triple Higgs interactions can enter at tree-level in the cross section production of two Higgs bosons. In this talk, we analyze the main production channels at e^{+}e^{-} colliders in the 2HDM, namely e^{+}e^{-}\to h_{i}h_{j}\nu\bar{\nu} and e^{+}e^{-}\to h_{i}h_{j}Z with h_{i}h_{j}=hh,\ hH,\ HH\ \text{or}\ AA, and we study the possible effects coming from the triple Higgs couplings. The results of the cross sections are presented in benchmark planes where large triple Higgs couplings can be realized inside the region allowed by all the relevant theoretical and experimental constraints. We also discuss on the relevance of studying the differential cross section on the invariant mass of the two final Higgs bosons to extract the effects of the triple Higgs couplings at future e^{+}e^{-} colliders. We explore the differential cross sections for several benchmark points and sizable effects from \lambda_{hhh}, \lambda_{hhH}, \lambda_{hHH} and \lambda_{hAA} are found, specially at large center-of-mass energies in the h_{i}h_{j}\nu\bar{\nu} production channel.
