Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 52: Higgs-Zerfälle in Fermionen II
T 52.9: Talk
Wednesday, March 27, 2019, 18:00–18:15, H04
Search for a very light pseudoscalar boson produced in decays of the 125 GeV Higgs boson in final state with two muons and two tau leptons in pp collisions at √s = 13 TeV — Somnath Choudhury4, •Sandra Consuegra Rodríguez1, Elisabetta Gallo2, Alexis Kalogeropoulos3, Danyer Pérez Adán1, Alexei Raspereza1, and Prabhat Solanki4 — 1DESY, Germany — 2DESY and University of Hamburg, Germany — 3Princeton University, USA — 4Indian Institute of Science, India
The results of the study of the H(125) boson properties allow the branching fraction of H(125) into non-SM particles to be as high as 34%. A vast set of models containing two Higgs doublets plus one additional Higgs singlet complex field (2HD+1S) are consistent with SM measurements, constraints from additional Higgs bosons and searches for supersymmetry, as well as with the measured properties of the H(125) boson. The Higgs sector of the 2HD+1S models features seven physical states: three CP-even, two CP-odd and two charged bosons. The lightest pseudoscalar boson a1 is potentially accessible in the H(125)→ a1 a1 decay, with sufficiently high rate to be detected at the LHC. A new search for a very light pseudoscalar higgs boson will be presented, investigating final states where one a1 boson decays into a pair of muons and the other into a pair of tau leptons. The search is based on a dataset corresponding to an integrated luminosity of 35.9 fb−1, collected with the CMS detector at √s=13 TeV, probing low mass a1 region between 3.6 and 19 GeV.