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Measurement of the CP structure of the Yukawa interaction in Higgs boson decays to tau leptons

The discovery of the Higgs boson in 2012 by the CMS and ATLAS collaborations marked the start of the exploration of the Higgs sector of particle physics. The properties of the Higgs sector under CP symmetry have been investigated mostly in its couplings to gauge bosons. With the full Run 2 data-taki...

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Autor principal: Cardini, Andrea
Lenguaje:eng
Publicado: 2021
Materias:
Acceso en línea:https://dx.doi.org/10.22323/1.397.0209
http://cds.cern.ch/record/2797520
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author Cardini, Andrea
author_facet Cardini, Andrea
author_sort Cardini, Andrea
collection CERN
description The discovery of the Higgs boson in 2012 by the CMS and ATLAS collaborations marked the start of the exploration of the Higgs sector of particle physics. The properties of the Higgs sector under CP symmetry have been investigated mostly in its couplings to gauge bosons. With the full Run 2 data-taking period it became possible to study the CP properties of the Yukawa coupling of the Higgs to fermions, and in particular to tau leptons. This was done reconstructing the decay planes of the two tau leptons and measuring their angular correlation. The measured mixing angle between CP-even and CP-odd couplings is (4$\pm$17)$^\circ$ and is consistent with the Standard Model prediction of a pure CP-even coupling and allows to constrain the allowed phase space for possible BSM scenarios. A pure CP-odd hypothesis is instead excluded with 99.7\% confidence level.
id cern-2797520
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2021
record_format invenio
spelling cern-27975202022-02-25T21:30:53Zdoi:10.22323/1.397.0209http://cds.cern.ch/record/2797520engCardini, AndreaMeasurement of the CP structure of the Yukawa interaction in Higgs boson decays to tau leptonsDetectors and Experimental TechniquesThe discovery of the Higgs boson in 2012 by the CMS and ATLAS collaborations marked the start of the exploration of the Higgs sector of particle physics. The properties of the Higgs sector under CP symmetry have been investigated mostly in its couplings to gauge bosons. With the full Run 2 data-taking period it became possible to study the CP properties of the Yukawa coupling of the Higgs to fermions, and in particular to tau leptons. This was done reconstructing the decay planes of the two tau leptons and measuring their angular correlation. The measured mixing angle between CP-even and CP-odd couplings is (4$\pm$17)$^\circ$ and is consistent with the Standard Model prediction of a pure CP-even coupling and allows to constrain the allowed phase space for possible BSM scenarios. A pure CP-odd hypothesis is instead excluded with 99.7\% confidence level.CMS-CR-2021-139oai:cds.cern.ch:27975202021-09-09
spellingShingle Detectors and Experimental Techniques
Cardini, Andrea
Measurement of the CP structure of the Yukawa interaction in Higgs boson decays to tau leptons
title Measurement of the CP structure of the Yukawa interaction in Higgs boson decays to tau leptons
title_full Measurement of the CP structure of the Yukawa interaction in Higgs boson decays to tau leptons
title_fullStr Measurement of the CP structure of the Yukawa interaction in Higgs boson decays to tau leptons
title_full_unstemmed Measurement of the CP structure of the Yukawa interaction in Higgs boson decays to tau leptons
title_short Measurement of the CP structure of the Yukawa interaction in Higgs boson decays to tau leptons
title_sort measurement of the cp structure of the yukawa interaction in higgs boson decays to tau leptons
topic Detectors and Experimental Techniques
url https://dx.doi.org/10.22323/1.397.0209
http://cds.cern.ch/record/2797520
work_keys_str_mv AT cardiniandrea measurementofthecpstructureoftheyukawainteractioninhiggsbosondecaystotauleptons