Search for a light pseudoscalar Higgs boson in the boosted μμττ final state in proton-proton collisions at s$$ \sqrt{s} $$ = 13 TeV
Abstract A search for a light pseudoscalar Higgs boson (a) decaying from the 125 GeV (or a heavier) scalar Higgs boson (H) is performed using the 2016 LHC proton-proton collision data at s $$ \sqrt{s} $$ = 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1, collected by t...
| Main Authors: | , , , , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2021
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| Online Access: | https://hdl.handle.net/1721.1/131940 |
| _version_ | 1826213424939401216 |
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| author | Sirunyan, A. M Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Dragicevic, M. Erö, J. Escalante Del Valle, A. Frühwirth, R. Jeitler, M. Krammer, N. Lechner, L. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Sirunyan, A. M Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Dragicevic, M. Erö, J. Escalante Del Valle, A. Frühwirth, R. Jeitler, M. Krammer, N. Lechner, L. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. |
| author_sort | Sirunyan, A. M |
| collection | MIT |
| description | Abstract
A search for a light pseudoscalar Higgs boson (a) decaying from the 125 GeV (or a heavier) scalar Higgs boson (H) is performed using the 2016 LHC proton-proton collision data at
s
$$ \sqrt{s} $$
= 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1, collected by the CMS experiment. The analysis considers gluon fusion and vector boson fusion production of the H, followed by the decay H → aa → μμττ, and considers pseudoscalar masses in the range 3.6 < ma < 21 GeV. Because of the large mass difference between the H and the a bosons and the small masses of the a boson decay products, both the μμ and the ττ pairs have high Lorentz boost and are collimated. The ττ reconstruction efficiency is increased by modifying the standard technique for hadronic τ lepton decay reconstruction to account for a nearby muon. No significant signal is observed. Model-independent limits are set at 95% confidence level, as a function of ma, on the branching fraction (ℬ) for H → aa → μμττ, down to 1.5 (2.0) × 10−4 for mH = 125 (300) GeV. Model-dependent limits on ℬ(H → aa) are set within the context of two Higgs doublets plus singlet models, with the most stringent results obtained for Type-III models. These results extend current LHC searches for heavier a bosons that decay to resolved lepton pairs and provide the first such bounds for an H boson with a mass above 125 GeV. |
| first_indexed | 2024-09-23T15:49:19Z |
| format | Article |
| id | mit-1721.1/131940 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:49:19Z |
| publishDate | 2021 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | mit-1721.1/1319402024-01-02T16:10:38Z Search for a light pseudoscalar Higgs boson in the boosted μμττ final state in proton-proton collisions at s$$ \sqrt{s} $$ = 13 TeV Sirunyan, A. M Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Dragicevic, M. Erö, J. Escalante Del Valle, A. Frühwirth, R. Jeitler, M. Krammer, N. Lechner, L. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. Massachusetts Institute of Technology. Department of Physics Abstract A search for a light pseudoscalar Higgs boson (a) decaying from the 125 GeV (or a heavier) scalar Higgs boson (H) is performed using the 2016 LHC proton-proton collision data at s $$ \sqrt{s} $$ = 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1, collected by the CMS experiment. The analysis considers gluon fusion and vector boson fusion production of the H, followed by the decay H → aa → μμττ, and considers pseudoscalar masses in the range 3.6 < ma < 21 GeV. Because of the large mass difference between the H and the a bosons and the small masses of the a boson decay products, both the μμ and the ττ pairs have high Lorentz boost and are collimated. The ττ reconstruction efficiency is increased by modifying the standard technique for hadronic τ lepton decay reconstruction to account for a nearby muon. No significant signal is observed. Model-independent limits are set at 95% confidence level, as a function of ma, on the branching fraction (ℬ) for H → aa → μμττ, down to 1.5 (2.0) × 10−4 for mH = 125 (300) GeV. Model-dependent limits on ℬ(H → aa) are set within the context of two Higgs doublets plus singlet models, with the most stringent results obtained for Type-III models. These results extend current LHC searches for heavier a bosons that decay to resolved lepton pairs and provide the first such bounds for an H boson with a mass above 125 GeV. 2021-09-20T17:31:02Z 2021-09-20T17:31:02Z 2020-08-27 2020-11-29T04:22:07Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/131940 Journal of High Energy Physics. 2020 Aug 27;2020(8):139 PUBLISHER_CC en https://doi.org/10.1007/JHEP08(2020)139 Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Berlin Heidelberg Springer Berlin Heidelberg |
| spellingShingle | Sirunyan, A. M Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Dragicevic, M. Erö, J. Escalante Del Valle, A. Frühwirth, R. Jeitler, M. Krammer, N. Lechner, L. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. Search for a light pseudoscalar Higgs boson in the boosted μμττ final state in proton-proton collisions at s$$ \sqrt{s} $$ = 13 TeV |
| title | Search for a light pseudoscalar Higgs boson in the boosted μμττ final state in proton-proton collisions at s$$ \sqrt{s} $$ = 13 TeV |
| title_full | Search for a light pseudoscalar Higgs boson in the boosted μμττ final state in proton-proton collisions at s$$ \sqrt{s} $$ = 13 TeV |
| title_fullStr | Search for a light pseudoscalar Higgs boson in the boosted μμττ final state in proton-proton collisions at s$$ \sqrt{s} $$ = 13 TeV |
| title_full_unstemmed | Search for a light pseudoscalar Higgs boson in the boosted μμττ final state in proton-proton collisions at s$$ \sqrt{s} $$ = 13 TeV |
| title_short | Search for a light pseudoscalar Higgs boson in the boosted μμττ final state in proton-proton collisions at s$$ \sqrt{s} $$ = 13 TeV |
| title_sort | search for a light pseudoscalar higgs boson in the boosted μμττ final state in proton proton collisions at s sqrt s 13 tev |
| url | https://hdl.handle.net/1721.1/131940 |
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