Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 76: Higgs-Zerfälle in Bosonen
T 76.10: Talk
Thursday, March 28, 2019, 18:15–18:30, H04
Search for a pseudoscalar boson produced in decays of the 125 GeV Higgs boson and decaying into τ leptons — Somnath Choudhury4, Sandra Consuegra Rodríguez1, Elisabetta Gallo2, Alexis Kalogeropoulos3, Teresa Lenz1, •Danyer Pérez Adán1, and Alexei Raspereza1 — 1DESY, Germany — 2DESY and University of Hamburg, Germany — 3Princeton University, USA — 4Indian Institute of Science, India
Several theories extending the Standard Model (SM) have predicted the existence of additional Higgs bosons. Searches for these extra Higgs bosons have focused primarily on general two Higgs doublet models (2HDM) as well as the minimal supersymmetric standard model, whose Higgs sector corresponds to the 2HDM. However, models where the two Higgs doublets are extended by one additional Higgs singlet complex field (2HD+1S) are consistent with SM measurements and constraints from searches for additional Higgs bosons. The Higgs sector of the 2HD+1S models contains seven physical states, namely three CP-even, two CP-odd and two charged bosons. There exist scenarios where the lightest pseudoscalar boson (a1) can have a mass in the range 2mτ<ma1<2mb, and this case becomes potentially accessible in the channel H(125)→ a1 a1 → 4τ. This analysis presents a search for pairs of very light pseudoscalar bosons, in the mass range between 4 and 15 GeV, produced in the decay of the 125 GeV Higgs boson, and each decaying to pairs of τ leptons. This search is based on proton-proton collision data collected by the CMS experiment at a centre-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 35.9 fb−1.