Can a pseudoscalar with a mass of 365 GeV in two-Higgs-doublet models explain the CMS tt¯ excess?
We investigate the recently reported tt¯ excess by the CMS Collaboration within the framework of conventional Two-Higgs-Doublet Models (2HDMs). Considering all four types (I, II, X, and Y), we perform a comprehensive parameter space scan using the best-fit values for a pseudoscalar boson A: MA=365 G...
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| Language: | English |
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Elsevier
2024-12-01
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| Series: | Physics Letters B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269324006798 |
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| author | Chih-Ting Lu Kingman Cheung Dongjoo Kim Soojin Lee Jeonghyeon Song |
| author_facet | Chih-Ting Lu Kingman Cheung Dongjoo Kim Soojin Lee Jeonghyeon Song |
| author_sort | Chih-Ting Lu |
| collection | DOAJ |
| description | We investigate the recently reported tt¯ excess by the CMS Collaboration within the framework of conventional Two-Higgs-Doublet Models (2HDMs). Considering all four types (I, II, X, and Y), we perform a comprehensive parameter space scan using the best-fit values for a pseudoscalar boson A: MA=365 GeV, ΓA/MA=2%, and tanβ=1.28. Theoretical requirements and experimental constraints are systematically applied, including conditions from a bounded-below scalar potential, vacuum stability, unitarity, perturbativity, Flavor-Changing Neutral Currents (FCNCs), and direct searches at high-energy colliders. Our analysis shows that perturbativity imposes upper bounds of around 723 GeV on MH± and MH. FCNC constraints exclude all viable parameter space in Types II and Y, while a small region persists in Types I and X, but this region is ultimately ruled out by recent tt¯Z measurements by the ATLAS and CMS Collaborations at the LHC. We conclude that conventional 2HDMs alone cannot accommodate a pseudoscalar boson that explains the observed tt¯ excess within viable parameter space. However, incorporating toponium effects in the background fit could potentially alter this conclusion. |
| format | Article |
| id | doaj-art-abbf79f206544f818cbc0ae2e55eea85 |
| institution | Kabale University |
| issn | 0370-2693 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj-art-abbf79f206544f818cbc0ae2e55eea852024-11-30T07:08:54ZengElsevierPhysics Letters B0370-26932024-12-01859139121Can a pseudoscalar with a mass of 365 GeV in two-Higgs-doublet models explain the CMS tt¯ excess?Chih-Ting Lu0Kingman Cheung1Dongjoo Kim2Soojin Lee3Jeonghyeon Song4Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, 210023, ChinaDepartment of Physics, Konkuk University, Seoul 05029, Republic of Korea; Department of Physics, National Tsing Hwa University, Hsinchu 300, Taiwan; Center for Theory and Computation, National Tsing Hua University, Hsinchu 300, Taiwan; Corresponding authors.Department of Physics, Konkuk University, Seoul 05029, Republic of KoreaDepartment of Physics, Konkuk University, Seoul 05029, Republic of KoreaDepartment of Physics, Konkuk University, Seoul 05029, Republic of Korea; Corresponding authors.We investigate the recently reported tt¯ excess by the CMS Collaboration within the framework of conventional Two-Higgs-Doublet Models (2HDMs). Considering all four types (I, II, X, and Y), we perform a comprehensive parameter space scan using the best-fit values for a pseudoscalar boson A: MA=365 GeV, ΓA/MA=2%, and tanβ=1.28. Theoretical requirements and experimental constraints are systematically applied, including conditions from a bounded-below scalar potential, vacuum stability, unitarity, perturbativity, Flavor-Changing Neutral Currents (FCNCs), and direct searches at high-energy colliders. Our analysis shows that perturbativity imposes upper bounds of around 723 GeV on MH± and MH. FCNC constraints exclude all viable parameter space in Types II and Y, while a small region persists in Types I and X, but this region is ultimately ruled out by recent tt¯Z measurements by the ATLAS and CMS Collaborations at the LHC. We conclude that conventional 2HDMs alone cannot accommodate a pseudoscalar boson that explains the observed tt¯ excess within viable parameter space. However, incorporating toponium effects in the background fit could potentially alter this conclusion.http://www.sciencedirect.com/science/article/pii/S0370269324006798Higgs physicsBeyond the Standard ModelElectroweak precision data |
| spellingShingle | Chih-Ting Lu Kingman Cheung Dongjoo Kim Soojin Lee Jeonghyeon Song Can a pseudoscalar with a mass of 365 GeV in two-Higgs-doublet models explain the CMS tt¯ excess? Physics Letters B Higgs physics Beyond the Standard Model Electroweak precision data |
| title | Can a pseudoscalar with a mass of 365 GeV in two-Higgs-doublet models explain the CMS tt¯ excess? |
| title_full | Can a pseudoscalar with a mass of 365 GeV in two-Higgs-doublet models explain the CMS tt¯ excess? |
| title_fullStr | Can a pseudoscalar with a mass of 365 GeV in two-Higgs-doublet models explain the CMS tt¯ excess? |
| title_full_unstemmed | Can a pseudoscalar with a mass of 365 GeV in two-Higgs-doublet models explain the CMS tt¯ excess? |
| title_short | Can a pseudoscalar with a mass of 365 GeV in two-Higgs-doublet models explain the CMS tt¯ excess? |
| title_sort | can a pseudoscalar with a mass of 365 gev in two higgs doublet models explain the cms tt¯ excess |
| topic | Higgs physics Beyond the Standard Model Electroweak precision data |
| url | http://www.sciencedirect.com/science/article/pii/S0370269324006798 |
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