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The $\hat{H}$-Parameter: An Oblique Higgs View
We study, from theoretical and phenomenological angles, the Higgs boson oblique parameter Ĥ, as the hallmark of off-shell Higgs physics. Ĥ is defined as the Wilson coefficient of the sole dimension-6 operator that modifies the Higgs boson propagator, within a Universal EFT. Theoretically, we describ...
| Autores principales: | , , , |
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| Lenguaje: | eng |
| Publicado: |
2019
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1007/JHEP09(2019)041 http://cds.cern.ch/record/2668343 |
| _version_ | 1780962163784941568 |
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| author | Englert, Christoph Giudice, Gian F. Greljo, Admir Mccullough, Matthew |
| author_facet | Englert, Christoph Giudice, Gian F. Greljo, Admir Mccullough, Matthew |
| author_sort | Englert, Christoph |
| collection | CERN |
| description | We study, from theoretical and phenomenological angles, the Higgs boson oblique parameter Ĥ, as the hallmark of off-shell Higgs physics. Ĥ is defined as the Wilson coefficient of the sole dimension-6 operator that modifies the Higgs boson propagator, within a Universal EFT. Theoretically, we describe self-consistency conditions on Wilson coefficients, derived from the Källén-Lehmann representation. Phenomenologically, we demonstrate that the process gg → h$^{∗}$ → V V is insensitive to propagator corrections from Ĥ, and instead advertise four-top production as an effective high-energy probe of off-shell Higgs behaviour, crucial to break flat directions in the EFT. |
| id | cern-2668343 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2019 |
| record_format | invenio |
| spelling | cern-26683432023-10-04T08:49:40Zdoi:10.1007/JHEP09(2019)041http://cds.cern.ch/record/2668343engEnglert, ChristophGiudice, Gian F.Greljo, AdmirMccullough, MatthewThe $\hat{H}$-Parameter: An Oblique Higgs Viewhep-phParticle Physics - PhenomenologyWe study, from theoretical and phenomenological angles, the Higgs boson oblique parameter Ĥ, as the hallmark of off-shell Higgs physics. Ĥ is defined as the Wilson coefficient of the sole dimension-6 operator that modifies the Higgs boson propagator, within a Universal EFT. Theoretically, we describe self-consistency conditions on Wilson coefficients, derived from the Källén-Lehmann representation. Phenomenologically, we demonstrate that the process gg → h$^{∗}$ → V V is insensitive to propagator corrections from Ĥ, and instead advertise four-top production as an effective high-energy probe of off-shell Higgs behaviour, crucial to break flat directions in the EFT.We study, from theoretical and phenomenological angles, the Higgs boson oblique parameter $\hat{H}$, as the hallmark of off-shell Higgs physics. $\hat{H}$ is defined as the Wilson coefficient of the sole dimension-6 operator that modifies the Higgs boson propagator, within a Universal EFT. Theoretically, we describe self-consistency conditions on Wilson coefficients, derived from the K\"{a}ll\'{e}n-Lehmann representation. Phenomenologically, we demonstrate that the process $gg\to h^\ast \to VV$ is insensitive to propagator corrections from $\hat{H}$, and instead advertise four-top production as an effective high-energy probe of off-shell Higgs behaviour, crucial to break flat directions in the EFT.arXiv:1903.07725CERN-TH-2019-027DAMTP-2019-8oai:cds.cern.ch:26683432019-03-18 |
| spellingShingle | hep-ph Particle Physics - Phenomenology Englert, Christoph Giudice, Gian F. Greljo, Admir Mccullough, Matthew The $\hat{H}$-Parameter: An Oblique Higgs View |
| title | The $\hat{H}$-Parameter: An Oblique Higgs View |
| title_full | The $\hat{H}$-Parameter: An Oblique Higgs View |
| title_fullStr | The $\hat{H}$-Parameter: An Oblique Higgs View |
| title_full_unstemmed | The $\hat{H}$-Parameter: An Oblique Higgs View |
| title_short | The $\hat{H}$-Parameter: An Oblique Higgs View |
| title_sort | $\hat{h}$-parameter: an oblique higgs view |
| topic | hep-ph Particle Physics - Phenomenology |
| url | https://dx.doi.org/10.1007/JHEP09(2019)041 http://cds.cern.ch/record/2668343 |
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