Revisiting lepton-specific 2HDM in light of muon g-2 anomaly

Abstract

We examine the lepton-specific 2HDM as a solution of muon g?2 anomaly under various theoretical and experimental constraints, especially the direct search limits from the LHC and the requirement of a strong first-order phase transition in the early universe. We find that the muon g?2 anomaly can be explained in the region of 32<tan?��<80, 10GeV<mA<65GeV, 260GeV<mH<620GeV and 180GeV<mH��<620GeV after imposing the joint constraints from the theory, the precision electroweak data, the 125 GeV Higgs data, the leptonic/semi-hadronic �� decays, the leptonic Z decays and Br(Bs���+��?). The direct searches from the h��AA channels can impose stringent upper limits on Br(h��AA) and the multi-lepton event searches can sizably reduce the allowed region of mA and tan?�� (10GeV<mA<44GeV and 32<tan?��<60). Finally, we find that the model can produce a strong first-order phase transition in the region of 14GeV<mA<25GeV, 310GeV<mH<355GeV and 250GeV<mH��<295GeV, allowed by the explanation of the muon g?2 anomaly. ? 2018 The Author