Search for the Exotic Decay of the Higgs Boson into a Pair of Light (Pseudo-)Scalar Higgs Boson in e+e− Collider
This study focuses on the exotic decay of the Higgs boson into a pair of light (pseudo-)scalar bosons (h → aa), where the mass of a boson ranges from 10 to 60 GeV. The primary objective is to assess the sensitivity of e+e− collider in probing these decays, particularly in the h → aa → bbττ channel....
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EDP Sciences
2024-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2024/25/epjconf_lcws2024_01029.pdf |
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| author | Nee Cheng-Hsu Mohammadi Abdollah Dasu Sridhara |
| author_facet | Nee Cheng-Hsu Mohammadi Abdollah Dasu Sridhara |
| author_sort | Nee Cheng-Hsu |
| collection | DOAJ |
| description | This study focuses on the exotic decay of the Higgs boson into a pair of light (pseudo-)scalar bosons (h → aa), where the mass of a boson ranges from 10 to 60 GeV. The primary objective is to assess the sensitivity of e+e− collider in probing these decays, particularly in the h → aa → bbττ channel. Advanced event generation and reconstruction techniques were employed, including tailored tau identification and a specialized b-jet identification method, to efficiently isolate signal from background events. The analysis approach allows for reconstruction of the a bosons from both the ττ and bb final states. The model-independent analysis resulted in a 95% confidence level upper limit on the cross-section σ (e+e− → Zh → Zaa → llbbττ) and on the branching ratio BR (h → aa → bbττ). Additionally, a model-dependent analysis can be used to set a 95% confidence level upper limit on BR(h → aa) within the two-Higgs-doublet-plus-singlet (2HDM+S) models. Both analyses show sensitivity comparable to the CMS results, with improved sensitivity in the lower a boson mass region, despite utilizing only the Z → e+e−/µ+µ− and h → aa → bbττ channels. In conclusion, the presented study demonstrates the strong potential of e+e− colliders in detecting light (pseudo-)scalar bosons, with future improvements possible through the inclusion of additional decay channels. The analysis suggests that e+e− collider has the potential to achieve greater sensitivity than LHC / HL-LHC. |
| format | Article |
| id | doaj-art-1ffcc3e93bcb4519bdefccc99d1d4ff7 |
| institution | Kabale University |
| issn | 2100-014X |
| language | English |
| publishDate | 2024-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj-art-1ffcc3e93bcb4519bdefccc99d1d4ff72025-01-06T11:33:47ZengEDP SciencesEPJ Web of Conferences2100-014X2024-01-013150102910.1051/epjconf/202431501029epjconf_lcws2024_01029Search for the Exotic Decay of the Higgs Boson into a Pair of Light (Pseudo-)Scalar Higgs Boson in e+e− ColliderNee Cheng-Hsu0Mohammadi Abdollah1Dasu Sridhara2Department of Physics, University of Wisconsin-MadisonDepartment of Physics, University of Wisconsin-MadisonDepartment of Physics, University of Wisconsin-MadisonThis study focuses on the exotic decay of the Higgs boson into a pair of light (pseudo-)scalar bosons (h → aa), where the mass of a boson ranges from 10 to 60 GeV. The primary objective is to assess the sensitivity of e+e− collider in probing these decays, particularly in the h → aa → bbττ channel. Advanced event generation and reconstruction techniques were employed, including tailored tau identification and a specialized b-jet identification method, to efficiently isolate signal from background events. The analysis approach allows for reconstruction of the a bosons from both the ττ and bb final states. The model-independent analysis resulted in a 95% confidence level upper limit on the cross-section σ (e+e− → Zh → Zaa → llbbττ) and on the branching ratio BR (h → aa → bbττ). Additionally, a model-dependent analysis can be used to set a 95% confidence level upper limit on BR(h → aa) within the two-Higgs-doublet-plus-singlet (2HDM+S) models. Both analyses show sensitivity comparable to the CMS results, with improved sensitivity in the lower a boson mass region, despite utilizing only the Z → e+e−/µ+µ− and h → aa → bbττ channels. In conclusion, the presented study demonstrates the strong potential of e+e− colliders in detecting light (pseudo-)scalar bosons, with future improvements possible through the inclusion of additional decay channels. The analysis suggests that e+e− collider has the potential to achieve greater sensitivity than LHC / HL-LHC.https://www.epj-conferences.org/articles/epjconf/pdf/2024/25/epjconf_lcws2024_01029.pdf |
| spellingShingle | Nee Cheng-Hsu Mohammadi Abdollah Dasu Sridhara Search for the Exotic Decay of the Higgs Boson into a Pair of Light (Pseudo-)Scalar Higgs Boson in e+e− Collider EPJ Web of Conferences |
| title | Search for the Exotic Decay of the Higgs Boson into a Pair of Light (Pseudo-)Scalar Higgs Boson in e+e− Collider |
| title_full | Search for the Exotic Decay of the Higgs Boson into a Pair of Light (Pseudo-)Scalar Higgs Boson in e+e− Collider |
| title_fullStr | Search for the Exotic Decay of the Higgs Boson into a Pair of Light (Pseudo-)Scalar Higgs Boson in e+e− Collider |
| title_full_unstemmed | Search for the Exotic Decay of the Higgs Boson into a Pair of Light (Pseudo-)Scalar Higgs Boson in e+e− Collider |
| title_short | Search for the Exotic Decay of the Higgs Boson into a Pair of Light (Pseudo-)Scalar Higgs Boson in e+e− Collider |
| title_sort | search for the exotic decay of the higgs boson into a pair of light pseudo scalar higgs boson in e e collider |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2024/25/epjconf_lcws2024_01029.pdf |
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