Models with two Higgs doublets and a light pseudoscalar: A portal to dark matter and the possible (g−2)μ excess Arcadi, Giorgio Djouadi, Abdelhak da Silva Queiroz, Farinaldo Acknowledgements AD is supported by the Estonian Research Council (ERC) grant MOBTT86 and by the Junta de Andalucíathrough the Talentia Se-nior program as well as by A-FQM-211-UGR18, P18-FR-4314 with ERDF. FSQ have been supported by the São Paulo Research Foun-dation (FAPESP) through Grant No. 2015/15897-1 and ICTP-SAIFR FAPESP grant 2016/01343-7. FSQ work was supported by the Ser-rapilheira Institute (grant number Serra-1912-31613), ANID – Millennium Program – ICN2019-044, and CNPq grants303817/2018-6and 421952/2018-0. In the context of a two-Higgs doublet model, supplemented by an additional light pseudoscalar Higgs boson and a stable isosinglet fermion, we consider the possibility of addressing simultaneously the discrepancy from the standard expectation of the anomalous magnetic moment of the muon recently measured at Fermilab and the longstanding problem of the dark matter in the universe which can be accounted for by a thermal weakly interacting massive particle. We show that it is indeed possible, for a range of masses and couplings of the new light pseudoscalar and the fermionic states, to explain at the same time the two features while satisfying all other constraints from astroparticle physics and collider searches, including the constraints from flavor physics. 2022-10-18T08:15:06Z 2022-10-18T08:15:06Z 2022-09-07 journal article G. Arcadi,A. Djouadi and F.S. Queiroz. Models with two Higgs doublets and a light pseudoscalar: A portal to dark matter and the possible (g−2)μ excess. Physics Letters B834 (2022) 137436 [https://doi.org/10.1016/j.physletb.2022.137436] https://hdl.handle.net/10481/77374 10.1016/j.physletb.2022.137436 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Elsevier