The flavor of a light charged Higgs
Abstract The ATLAS Collaboration has recently reported a search for light-charged Higgs in t → H + b decay, with H + → c b ¯ $$ {H}^{+}\to c\overline{b} $$ . An excess with a local significance of approximately 3σ is found at m H + $$ {m}_{H^{+}} $$ ≈ 130 GeV, with a best-fit value of BR(t → H + b)...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-10-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP10(2023)078 |
| _version_ | 1797341456172580864 |
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| author | Nicolás Bernal Marta Losada Yosef Nir Yogev Shpilman |
| author_facet | Nicolás Bernal Marta Losada Yosef Nir Yogev Shpilman |
| author_sort | Nicolás Bernal |
| collection | DOAJ |
| description | Abstract The ATLAS Collaboration has recently reported a search for light-charged Higgs in t → H + b decay, with H + → c b ¯ $$ {H}^{+}\to c\overline{b} $$ . An excess with a local significance of approximately 3σ is found at m H + $$ {m}_{H^{+}} $$ ≈ 130 GeV, with a best-fit value of BR(t → H + b) × BR( H + → c b ¯ $$ {H}^{+}\to c\overline{b} $$ ) = (1.6 ± 0.6) × 10 −3. We study the implications of such a hypothetical signal in multi-Higgs doublet models. We take into account constraints from searches for other charged Higgs decays and from flavor-changing neutral current processes. Two Higgs doublet models with flavor structure dictated by natural flavor conservation (NFC), minimal flavor violation (MFV), or the Froggatt-Nielsen (FN) mechanism cannot account for such excess. A three-Higgs doublet model with NFC can account for the signal. The Yukawa couplings of the neutral pseudoscalar A in the down sector, Y ̂ A D $$ {\hat{Y}}_A^D $$ , should be larger by a factor of 4 – 6 compared to the corresponding Yukawa couplings of the Higgs h, Y ̂ h D $$ {\hat{Y}}_h^D $$ . We further present two minimal scenarios, one in which a single Yukawa coupling in the down sector, Y ̂ A D bb $$ {\left({\hat{Y}}_A^D\right)}_{bb} $$ , gives the only significant contribution, and one in which two Yukawa couplings in the up sector, Y ̂ A U tt $$ {\left({\hat{Y}}_A^U\right)}_{tt} $$ and Y ̂ A U tc $$ {\left({\hat{Y}}_A^U\right)}_{tc} $$ , give the only significant contributions, and we discuss possible tests of these scenarios. |
| first_indexed | 2024-03-08T10:18:19Z |
| format | Article |
| id | doaj.art-ff124ee41e77436eaed46749f2b8bf49 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-08T10:18:19Z |
| publishDate | 2023-10-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-ff124ee41e77436eaed46749f2b8bf492024-01-28T12:10:19ZengSpringerOpenJournal of High Energy Physics1029-84792023-10-0120231012310.1007/JHEP10(2023)078The flavor of a light charged HiggsNicolás Bernal0Marta Losada1Yosef Nir2Yogev Shpilman3New York University Abu DhabiNew York University Abu DhabiDepartment of Particle Physics and Astrophysics, Weizmann Institute of ScienceDepartment of Particle Physics and Astrophysics, Weizmann Institute of ScienceAbstract The ATLAS Collaboration has recently reported a search for light-charged Higgs in t → H + b decay, with H + → c b ¯ $$ {H}^{+}\to c\overline{b} $$ . An excess with a local significance of approximately 3σ is found at m H + $$ {m}_{H^{+}} $$ ≈ 130 GeV, with a best-fit value of BR(t → H + b) × BR( H + → c b ¯ $$ {H}^{+}\to c\overline{b} $$ ) = (1.6 ± 0.6) × 10 −3. We study the implications of such a hypothetical signal in multi-Higgs doublet models. We take into account constraints from searches for other charged Higgs decays and from flavor-changing neutral current processes. Two Higgs doublet models with flavor structure dictated by natural flavor conservation (NFC), minimal flavor violation (MFV), or the Froggatt-Nielsen (FN) mechanism cannot account for such excess. A three-Higgs doublet model with NFC can account for the signal. The Yukawa couplings of the neutral pseudoscalar A in the down sector, Y ̂ A D $$ {\hat{Y}}_A^D $$ , should be larger by a factor of 4 – 6 compared to the corresponding Yukawa couplings of the Higgs h, Y ̂ h D $$ {\hat{Y}}_h^D $$ . We further present two minimal scenarios, one in which a single Yukawa coupling in the down sector, Y ̂ A D bb $$ {\left({\hat{Y}}_A^D\right)}_{bb} $$ , gives the only significant contribution, and one in which two Yukawa couplings in the up sector, Y ̂ A U tt $$ {\left({\hat{Y}}_A^U\right)}_{tt} $$ and Y ̂ A U tc $$ {\left({\hat{Y}}_A^U\right)}_{tc} $$ , give the only significant contributions, and we discuss possible tests of these scenarios.https://doi.org/10.1007/JHEP10(2023)078Multi-Higgs ModelsSpecific BSM Phenomenology |
| spellingShingle | Nicolás Bernal Marta Losada Yosef Nir Yogev Shpilman The flavor of a light charged Higgs Journal of High Energy Physics Multi-Higgs Models Specific BSM Phenomenology |
| title | The flavor of a light charged Higgs |
| title_full | The flavor of a light charged Higgs |
| title_fullStr | The flavor of a light charged Higgs |
| title_full_unstemmed | The flavor of a light charged Higgs |
| title_short | The flavor of a light charged Higgs |
| title_sort | flavor of a light charged higgs |
| topic | Multi-Higgs Models Specific BSM Phenomenology |
| url | https://doi.org/10.1007/JHEP10(2023)078 |
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